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Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

Memory upgrade: a stange mix of symptoms


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tiodan

 
Member Since: Oct 31, 2009
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As so many others have, I tried to upgrade my memory from the standard 1gig to 4. According to Crucial memory's system checker, the machine is a MacBook 2.1GHz Intel Core 2 Duo (13-inch White) MB402LL/A.

The existing memory is 667mHz, 2x512mb. The new memory is 800mHz, 2x2GB.

When I install both of the new sticks, the computer will not boot. No grey apple screen, just fan noise and the dvd drive checking-noise, then nothing. If I try one of the new sticks by itself, same result. This is true for both memory ports and both sticks. I thought maybe they weren't seated correctly, so I tried switching them and re-seating, both were ineffective whether I was trying one new stick alone or both together.

However, if I try one old stick with one new one, the computer boots and functions just fine. I tried this with both of the new sticks to make sure that neither was defective; both work fine. When I do this, the system profiler reports that both the new and old stick are running at 667mHz, even though the new stick is capable of 800.

Now, I've seen some forum posts indicating that older machines can only work with 667mHz memory, but why would it boot without problems when I mix one 800mHz with one 667? Also, is there a way to downclock the 2 new ones to 667?
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Dysfunction

 
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Contact Crucial, have them send you new ram.

mike
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Got # ? phear the command line!
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oddtimer

 
Member Since: Nov 27, 2008
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Mac Specs: MacBook Pro 17" LED-Backlite display, 2.5GHz Intel Core 2 Duo, 4GB memory, 512MB VRAM, 320GB HD

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In my experience, you always want to replace your memory with the *exact* specs of your current working memory. If this is not done any number of weird issues can result from it (as I have seen). If I were you I would just purchase 2x2gb@667 from newegg..

I've had good experience's in the past with Mushkin for macs...

Newegg.com - Mushkin Enhanced 4GB (2 x 2GB) DDR2 667 (PC2 5300) Dual Channel Kit Memory For Apple Model 976618A
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Dysfunction

 
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I'm not sure he needs to go buy NEW ram when Crucial will simply replace the ram he has with the correct 667mhz ram with a simple phone call.

mike
This machine kills fascists
Got # ? phear the command line!
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