Ram upgrade causing errors

[Nsummers82]

I recently purchased a MC508LL/A 21.5" Desktop PC 3.06GHz Core i3 1TB 4GB El Capitan. I also purchased a pair of Crucial 8gb ram modules to add in (2-8gb DDR3L-1333 SODIMM). When I had all 4 ram modules in I got a few errors and restarts (panic cpu 1 caller possible memory corruption). When I removed the factory ram and only used the Crucial ram I also got errors and restarts (same errors). Now the system just flashes the apple logo and immediately restarts. It works fine with the factory ram only. Any thoughts?

 

[pigoo3]

It works fine with the factory ram only. Any thoughts?

If the original ram works fine…and the new ram doesn't. The new ram is either faulty…or it's the wrong ram.

- Nick

 

[Nsummers82]

Specs looked exactly the same. Crucial 16GB Kit (8GBx2) DDR3L 1333 MT/s (PC3-10600) CL9 204-Pin SODIMM Memory For Mac CT2K8G3S1339M / CT2C8G3S1339M https://www.amazon.com/dp/B008LTBJK2/?tag=macforums0e4-20

 

[Nsummers82]

Anonymous UUID: 5D6279DA-F3A6-2F45-AF99-A0879090D3AA

Wed Jul 20 09:40:34 2016

*** Panic Report ***
panic(cpu 3 caller 0xffffff80185ce40a): Kernel trap at 0xffffff80185b43b0, type 13=general protection, registers:
CR0: 0x000000008001003b, CR2: 0x00007fff74dea020, CR3: 0x00000003d0cd709f, CR4: 0x00000000000226e0
RAX: 0x0000000000000004, RBX: 0xfffffea9517ccf08, RCX: 0xffffff8035600fe0, RDX: 0x00007fff741e1000
RSP: 0xffffff9202193c10, RBP: 0xffffff9202193cf0, RSI: 0x00007fff741e1000, RDI: 0x000000000000006f
R8: 0x0000000000000021, R9: 0xffffff803bc9b340, R10: 0xbfffffffffffff00, R11: 0x0000000000000000
R12: 0xe716b8c5b251e3af, R13: 0xffffff803bbb8f98, R14: 0xffffff80491efa10, R15: 0x000000000001bbf1
RFL: 0x0000000000010286, RIP: 0xffffff80185b43b0, CS: 0x0000000000000008, SS: 0x0000000000000000
Fault CR2: 0x00007fff74dea020, Error code: 0x0000000000000000, Fault CPU: 0x3, PL: 2

Backtrace (CPU 3), Frame : Return Address
0xffffff81f66a5df0 : 0xffffff80184dab12
0xffffff81f66a5e70 : 0xffffff80185ce40a
0xffffff81f66a6050 : 0xffffff80185ec273
0xffffff81f66a6070 : 0xffffff80185b43b0
0xffffff9202193cf0 : 0xffffff80185b4c36
0xffffff9202193d60 : 0xffffff8018560cc5
0xffffff9202193e70 : 0xffffff801855626c
0xffffff9202193ea0 : 0xffffff80184fea41
0xffffff9202193ee0 : 0xffffff801899a998
0xffffff9202193f50 : 0xffffff801899a6dc
0xffffff9202193f60 : 0xffffff8018a27fa1
0xffffff9202193fb0 : 0xffffff80185eca76

BSD process name corresponding to current thread: mdworker

Mac OS version:
15E65

Kernel version:
Darwin Kernel Version 15.4.0: Fri Feb 26 22:08:05 PST 2016; root:xnu-3248.40.184~3/RELEASE_X86_64
Kernel UUID: 4E7B4496-0B81-34E9-97AF-F316103B0839
Kernel slide: 0x0000000018200000
Kernel text base: 0xffffff8018400000
__HIB text base: 0xffffff8018300000
System model name: iMac11,2 (Mac-F2238AC8)

System uptime in nanoseconds: 306796826596
last loaded kext at 263879138684: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f9aea0000, size 69632)
last unloaded kext at 207903775576: com.apple.driver.usb.AppleUSBUHCI 1.0.1 (addr 0xffffff7f9948c000, size 126976)
loaded kexts:
com.apple.filesystems.msdosfs 1.10
com.apple.filesystems.smbfs 3.0.0
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AGPM 110.21.18
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleMikeyDriver 274.7
com.apple.driver.AppleHDA 274.7
com.apple.driver.pmtelemetry 1
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.kext.AMDFramebuffer 1.4.2
com.apple.iokit.IOBluetoothSerialManager 4.4.4f4
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.ATIRadeonX2000 10.0.0
com.apple.driver.AppleHV 1
com.apple.driver.AppleBacklight 170.8.9
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.4f4
com.apple.driver.AppleLPC 3.1
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
com.apple.kext.AMD4600Controller 1.4.2
com.apple.driver.AppleMCCSControl 1.2.13
com.apple.driver.AppleUSBCardReader 3.7.1
com.apple.driver.AppleIRController 327.5
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.BootCache 38
com.apple.iokit.SCSITaskUserClient 3.7.7
com.apple.iokit.IOAHCIBlockStorage 2.8.5
com.apple.iokit.AppleBCM5701Ethernet 10.2.0
com.apple.driver.AppleFWOHCI 5.5.2
com.apple.driver.AirPort.Atheros40 700.74.5
com.apple.driver.AppleAHCIPort 3.1.8
com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1
com.apple.driver.AppleACPIButtons 4.0
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 4.0
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0
com.apple.nke.applicationfirewall 163
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.AppleIntelCPUPowerManagement 218.0.0
com.apple.kext.triggers 1.0
com.apple.driver.DspFuncLib 274.7
com.apple.kext.OSvKernDSPLib 525
com.apple.iokit.IOSurface 108.2.1
com.apple.iokit.IOSerialFamily 11
com.apple.driver.CoreCaptureResponder 1
com.apple.driver.AppleBacklightExpert 1.1.0
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.4f4
com.apple.iokit.IOBluetoothFamily 4.4.4f4
com.apple.driver.AppleSMBusPCI 1.0.14d1
com.apple.driver.AppleHDAController 274.7
com.apple.iokit.IOHDAFamily 274.7
com.apple.iokit.IOAudioFamily 204.3
com.apple.vecLib.kext 1.2.0
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.IOPlatformPluginFamily 6.0.0d7
com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0
com.apple.kext.AMDSupport 1.4.2
com.apple.AppleGraphicsDeviceControl 3.12.6
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.AppleSMBusController 1.0.14d1
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.driver.usb.IOUSBHostHIDDevice 1.0.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7
com.apple.iokit.IOUSBMassStorageDriver 1.0.0
com.apple.iokit.IOUSBHIDDriver 900.4.1
com.apple.driver.usb.cdc 5.0.0
com.apple.driver.usb.networking 5.0.0
com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1
com.apple.driver.usb.AppleUSBHub 1.0.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.7
com.apple.iokit.IOBDStorageFamily 1.8
com.apple.iokit.IODVDStorageFamily 1.8
com.apple.iokit.IOCDStorageFamily 1.8
com.apple.iokit.IOAHCISerialATAPI 2.6.2
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7
com.apple.iokit.IOEthernetAVBController 1.0.3b3
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IOFireWireFamily 4.6.0
com.apple.iokit.IO80211Family 1110.26
com.apple.iokit.IONetworkingFamily 3.2
com.apple.driver.corecapture 1.0.4
com.apple.iokit.IOAHCIFamily 2.8.1
com.apple.driver.usb.AppleUSBEHCI 1.0.1
com.apple.iokit.IOUSBFamily 900.4.1
com.apple.iokit.IOUSBHostFamily 1.0.1
com.apple.driver.AppleUSBHostMergeProperties 1.0.1
com.apple.driver.AppleEFINVRAM 2.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.AppleKeyStore 2
com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.DiskImages 417.2
com.apple.iokit.IOStorageFamily 2.1
com.apple.iokit.IOReportFamily 31
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 4.0
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.Libm 1
com.apple.kec.pthread 1
com.apple.kec.corecrypto 1.0

 

[pigoo3]

Specs looked exactly the same. Crucial 16GB Kit (8GBx2) DDR3L 1333 MT/s (PC3-10600) CL9 204-Pin SODIMM Memory For Mac CT2K8G3S1339M / CT2C8G3S1339M https://www.amazon.com/dp/B008LTBJK2/?tag=macforums0e4-20

Like I said…ram could either be faulty or wrong type. If the correct ram was purchased…then that narrows things down…faulty ram.

Return & get replacement ram. Or return…and purchase ram from somewhere else…like OWC (macsales.com).

- Nick

 

[Nsummers82]

Thanks. I'm looking at their website now. Would faulty ram work "sometimes"? For instance, I'm currently using the iMac in question.

 

[pigoo3]

What you listed in post #4 is called a "Kernel Panic". Most times kernel panics are hardware related…and many times the faulty hardware is usually bad ram (on a computer that worked fine previously before new ram was installed).

Kernel panics are pretty much random. Sometimes you may get some extended stability…sometimes 10 minutes...sometimes 2 minutes…etc.

- Nick

 

[pigoo3]

It's really easy logic.

- Computer works fine with old ram.
- Computer does not work fine with new ram.

Conclusion. There's a problem with the new ram.

- Nick

p.s. You probably purchased 2 sticks of new ram. Very possible that only one of them is bad. But also remotely possible both are bad.

 

[Slydude]

Thanks. I'm looking at their website now. Would faulty ram work "sometimes"? For instance, I'm currently using the iMac in question.

Faulty ram can cause problems either intermittently or consistently. Several years ago I bought a new Mac from a reliable third-party vendor. It would sometimes run for days with no problems then suddenly have issues. Performance passed the Apple Hardware Test distributed with that machine. Finally, I downloaded a third-party utility to test the ram and failed immediately and consistently.

I think Nick is on the right track with memory issues being the problem.

 

[Nsummers82]

Crucial is sending out 2 new sticks. I'll try them and if I am still getting the same issue I'll try a different brand.

Thanks both of you for your help!

 

[Slydude]

I've used Crucial memory with good results. Never had to return the sticks I bought from them but the have a good reputation for standing by their products.

 

[pigoo3]

Please let us know how things turn out.

- Nick

 

[chscag]

Thanks. I'm looking at their website now. Would faulty ram work "sometimes"? For instance, I'm currently using the iMac in question.

Memory modules are sometimes difficult to "seat" properly in an iMac. Make sure the modules are seated properly and not halfway or partway pushed down in the slots. I suggest removing them and reseating them carefully. You may have to use some force to get them seat all the way in the slots, but be careful not to break anything.

 

[Nsummers82]

Please let us know how things turn out.

- Nick

Received 2 new sticks. installed and after about 20 minutes had a restart and got this:
Anonymous UUID: 5D6279DA-F3A6-2F45-AF99-A0879090D3AA

Fri Jul 22 21:38:25 2016

*** Panic Report ***
panic(cpu 2 caller 0xffffff801b9ce6fa): Kernel trap at 0xffffff801bd7e705, type 13=general protection, registers:
CR0: 0x000000008001003b, CR2: 0x0000000102200000, CR3: 0x00000004d4fd3045, CR4: 0x00000000000226e0
RAX: 0xffffff8040bc1008, RBX: 0xffffff8042c5a760, RCX: 0x2d0e150e190e490e, RDX: 0x2d0e150e190e490e
RSP: 0xffffff9274d93c30, RBP: 0xffffff9274d93c50, RSI: 0x000000000529d760, RDI: 0x0000000000000001
R8: 0xffffffff0fffffff, R9: 0x00000000f0000000, R10: 0x00000000f351bff0, R11: 0xffffff8043ce1960
R12: 0x0000000001a671b2, R13: 0xffffff8043788ce8, R14: 0xffffff804386a8e0, R15: 0x00000000000000e0
RFL: 0x0000000000010202, RIP: 0xffffff801bd7e705, CS: 0x0000000000000008, SS: 0x0000000000000000
Fault CR2: 0x0000000102200000, Error code: 0x0000000000000000, Fault CPU: 0x2, PL: 0

Backtrace (CPU 2), Frame : Return Address
0xffffff8268d7ddf0 : 0xffffff801b8dab52
0xffffff8268d7de70 : 0xffffff801b9ce6fa
0xffffff8268d7e050 : 0xffffff801b9ec563
0xffffff8268d7e070 : 0xffffff801bd7e705
0xffffff9274d93c50 : 0xffffff801bd7b78e
0xffffff9274d93c70 : 0xffffff801bd87abc
0xffffff9274d93c90 : 0xffffff801bd8698a
0xffffff9274d93d00 : 0xffffff801bd88282
0xffffff9274d93d40 : 0xffffff801bd9bc5a
0xffffff9274d93df0 : 0xffffff801b907543
0xffffff9274d93e30 : 0xffffff801b90ba5a
0xffffff9274d93e60 : 0xffffff801b8d5509
0xffffff9274d93ea0 : 0xffffff801b9cef3e
0xffffff9274d93ec0 : 0xffffff801b9ec52f

BSD process name corresponding to current thread: deleted

Mac OS version:
15G31

Kernel version:
Darwin Kernel Version 15.6.0: Thu Jun 23 18:25:34 PDT 2016; root:xnu-3248.60.10~1/RELEASE_X86_64
Kernel UUID: B5AA8E3E-65B6-3D0E-867B-8DCCF81E536C
Kernel slide: 0x000000001b600000
Kernel text base: 0xffffff801b800000
__HIB text base: 0xffffff801b700000
System model name: iMac11,2 (Mac-F2238AC8)

System uptime in nanoseconds: 1087462046068
last loaded kext at 975851461706: com.apple.driver.AppleXsanScheme 3 (addr 0xffffff7f9e2d6000, size 32768)
last unloaded kext at 361783565067: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f9e2ba000, size 61440)
loaded kexts:
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AGPM 110.22.0
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleMikeyDriver 274.12
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.driver.AppleHDA 274.12
com.apple.kext.AMDFramebuffer 1.4.2
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.6f1
com.apple.ATIRadeonX2000 10.0.0
com.apple.driver.pmtelemetry 1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.driver.AppleBacklight 170.8.9
com.apple.driver.AppleMCCSControl 1.2.13
com.apple.kext.AMD4600Controller 1.4.2
com.apple.driver.AppleLPC 3.1
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.iokit.IOBluetoothSerialManager 4.4.6f1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHV 1
com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
com.apple.driver.AppleIRController 327.6
com.apple.driver.AppleUSBCardReader 3.7.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.BootCache 38
com.apple.iokit.SCSITaskUserClient 3.7.7
com.apple.iokit.IOAHCIBlockStorage 2.8.5
com.apple.driver.AppleFWOHCI 5.5.4
com.apple.driver.AirPort.Atheros40 700.74.5
com.apple.iokit.AppleBCM5701Ethernet 10.2.0
com.apple.driver.AppleAHCIPort 3.1.8
com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleACPIButtons 4.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 4.0
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0
com.apple.nke.applicationfirewall 163
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.AppleIntelCPUPowerManagement 218.0.0
com.apple.driver.AppleXsanScheme 3
com.apple.driver.AppleBluetoothHIDKeyboard 181
com.apple.driver.IOBluetoothHIDDriver 4.4.6f1
com.apple.driver.AppleHIDKeyboard 181
com.apple.kext.triggers 1.0
com.apple.driver.DspFuncLib 274.12
com.apple.kext.OSvKernDSPLib 525
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.6f1
com.apple.iokit.IOSurface 108.2.3
com.apple.driver.AppleBacklightExpert 1.1.0
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.driver.AppleSMBusController 1.0.14d1
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.kext.AMDSupport 1.4.2
com.apple.AppleGraphicsDeviceControl 3.12.8
com.apple.driver.AppleSMBusPCI 1.0.14d1
com.apple.driver.AppleHDAController 274.12
com.apple.iokit.IOHDAFamily 274.12
com.apple.iokit.IOAudioFamily 204.4
com.apple.vecLib.kext 1.2.0
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.IOPlatformPluginFamily 6.0.0d7
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.iokit.IOSerialFamily 11
com.apple.iokit.IOBluetoothFamily 4.4.6f1
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.CoreCaptureResponder 1
com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0
com.apple.iokit.IOUSBHIDDriver 900.4.1
com.apple.driver.usb.IOUSBHostHIDDevice 1.0.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7
com.apple.iokit.IOUSBMassStorageDriver 1.0.0
com.apple.driver.usb.cdc 5.0.0
com.apple.driver.usb.networking 5.0.0
com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1
com.apple.driver.usb.AppleUSBHub 1.0.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.7
com.apple.iokit.IOBDStorageFamily 1.8
com.apple.iokit.IODVDStorageFamily 1.8
com.apple.iokit.IOCDStorageFamily 1.8
com.apple.iokit.IOAHCISerialATAPI 2.6.2
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7
com.apple.iokit.IOFireWireFamily 4.6.1
com.apple.iokit.IO80211Family 1110.26
com.apple.driver.corecapture 1.0.4
com.apple.iokit.IOEthernetAVBController 1.0.3b3
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOAHCIFamily 2.8.1
com.apple.iokit.IOUSBFamily 900.4.1
com.apple.driver.usb.AppleUSBEHCI 1.0.1
com.apple.iokit.IOUSBHostFamily 1.0.1
com.apple.driver.AppleUSBHostMergeProperties 1.0.1
com.apple.driver.AppleEFINVRAM 2.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.AppleKeyStore 2
com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.DiskImages 417.4
com.apple.iokit.IOStorageFamily 2.1
com.apple.iokit.IOReportFamily 31
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 4.0
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.Libm 1
com.apple.kec.pthread 1
com.apple.kec.corecrypto 1.0
Model: iMac11,2, BootROM IM112.0057.B03, 2 processors, Intel Core i3, 3.06 GHz, 20 GB, SMC 1.64f5
Graphics: ATI Radeon HD 4670, ATI Radeon HD 4670, PCIe, 256 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54313235533654465238432D48392020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54313235533654465238432D48392020
Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1333 MHz, 0x859B, 0x435438473353313333394D2E4D3136465000
Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1333 MHz, 0x859B, 0x435438473353313333394D2E4D3136465000
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.74.0-P2P
Bluetooth: Version 4.4.6f1 17910, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: ST1000DM003-1CH162, 1 TB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: 2.4G Wireless Mouse
USB Device: Card Reader
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: IR Receiver
USB Device: Built-in iSight
Thunderbolt Bus:

 

[Nsummers82]

It's showing that I currently have 20GB ram (8x2, 2x2) in About this Mac, which is correct. I've read that the max is either 16 or 32 (conflicting reports).

 

[chscag]

Max is 16 GB for that machine according to Mactracker and OWC. Your kernel panics are probably being caused by the 2 x 8 GB modules which may not be compatible with your model iMac. I would send the 8 GB modules back to Crucial and exchange them for 2 x 4 GB modules.

Your iMac is being identified by the system as an 11,2 which says it's a 21.5" 2010 model iMac. That model can only hold 16 GB of memory and it's likely the 8 GB modules will not work in it causing your KPs.

 

[pigoo3]

Received 2 new sticks. installed and after about 20 minutes had a restart and got this:

It was stated earlier that the iMac's original ram works fine. This indicates that the computer is fine.

The problem is the new ram. The ram is either faulty or incompatible. Since the new ram has been tried twice…I'm going to say we're talking incompatible ram…since two sets of faulty ram would be pretty darn rare.

My advice is return the ram…get a refund…and purchase from another store (for example macsales.com).

- Nick

 

[pigoo3]

By the way. Just looked up the specs on this computer. It has a max ram of 16 gig…and it has 4 ram slots. You should NOT be using 8gig sticks of ram. If you want 16gig of ram…as chscag mentioned earlier...you should be using 4gig sticks of ram (4 x 4gig).

The 8gig ram you have is probably fine…it just shouldn't be used in this computer.

- Nick

 

[Nsummers82]

Sound advice. I've been out of the computer world for about 10 years, and I've only been dealing with Mac's for a year.

So, 16gb is the max. 2x8gb is no good though? It has to be 4x4gb?

 

[Slydude]

That would be my guess. If there are four slots and the maximum memory is 16 GB then the maximum size for each chip will be 4 GB. The 8 GB may fit physically but there is probably something else preventing them from working. One of my earlier Macs would take a chip configuration where the machine could physically take more memory than the internal circuitry could "see" and make use of.