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Apple Computing Products:
macOS - Desktop Hardware
Which of these RAM upgrades should I buy for a Mac Pro 1,1?
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<blockquote data-quote="Exodist" data-source="post: 1619317" data-attributes="member: 284358"><p>Don't forget to check new egg also.. They have a section of mac certified ram. </p><p></p><p>Now I prefer OWC. This is because while others claim its mac certified, OWC test theirs on each model rigorously before saying it will work.</p><p>That said, RAM is RAM. Does not matter if its labeled PC or Mac its all the same stuff and is notoriously un predictable. The cheaper the ram the more unpredictable it can be. </p><p>Now Apple mostly uses Samsung RAM in their systems, at least recently. But if you mix RAM types or just even brands. You can be in for roller coaster ride. </p><p></p><p>Here is a checklist.</p><p>#1. Make sure the Voltage on all chips match.</p><p>#2. Make sure the Timing and CL matches.</p><p>#3. Make sure your RAMs speed matches or exceeds the specified speed requirement.</p><p></p><p>Now I will explain why..</p><p>#1, if the voltages don't match on all the chips, the system will may be adjustable between 1.3 and 1.5 volts, its only to regulate the entire stack, not per chip. So they all must match. Improper voltage can lead to chips overheating. And of course.. Crash/burn up the system..</p><p></p><p>#2, if the CL and Timing doesn't match, this is a sure way to get kernel panics. This is because the RAM needs to march in order, you get a stick or two not marching in sync and the system will crash.</p><p></p><p>#3, your system board can lower the speed of the RAM. So if the max speed is 1333Mhz, and your RAM is 1600, don't worry as most of the time the system will just lower it down to 1333 and you will not know the difference. But keep in mind if you have 1333Mhz RAM in your system and you throw in a 1000Mhz chip to add more memory. All of your current RAM sticks will be lowered to 1000Mhz. Which can actually hurt performance more then helping.</p><p></p><p>Lastly. For some odd reasons, some brands don't like to be mixed with other brands. Sometimes they work fine, but more often then not this is the largest pain in the rear for computer shops when users want to upgrade RAM in their system. I have bought lot of used RAM due to this. </p><p></p><p>Hope this helps..</p></blockquote><p></p>
[QUOTE="Exodist, post: 1619317, member: 284358"] Don't forget to check new egg also.. They have a section of mac certified ram. Now I prefer OWC. This is because while others claim its mac certified, OWC test theirs on each model rigorously before saying it will work. That said, RAM is RAM. Does not matter if its labeled PC or Mac its all the same stuff and is notoriously un predictable. The cheaper the ram the more unpredictable it can be. Now Apple mostly uses Samsung RAM in their systems, at least recently. But if you mix RAM types or just even brands. You can be in for roller coaster ride. Here is a checklist. #1. Make sure the Voltage on all chips match. #2. Make sure the Timing and CL matches. #3. Make sure your RAMs speed matches or exceeds the specified speed requirement. Now I will explain why.. #1, if the voltages don't match on all the chips, the system will may be adjustable between 1.3 and 1.5 volts, its only to regulate the entire stack, not per chip. So they all must match. Improper voltage can lead to chips overheating. And of course.. Crash/burn up the system.. #2, if the CL and Timing doesn't match, this is a sure way to get kernel panics. This is because the RAM needs to march in order, you get a stick or two not marching in sync and the system will crash. #3, your system board can lower the speed of the RAM. So if the max speed is 1333Mhz, and your RAM is 1600, don't worry as most of the time the system will just lower it down to 1333 and you will not know the difference. But keep in mind if you have 1333Mhz RAM in your system and you throw in a 1000Mhz chip to add more memory. All of your current RAM sticks will be lowered to 1000Mhz. Which can actually hurt performance more then helping. Lastly. For some odd reasons, some brands don't like to be mixed with other brands. Sometimes they work fine, but more often then not this is the largest pain in the rear for computer shops when users want to upgrade RAM in their system. I have bought lot of used RAM due to this. Hope this helps.. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Which of these RAM upgrades should I buy for a Mac Pro 1,1?
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