Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Can it uses DDR2 PC2 6400 memory?

Hi guys,

I'm browsing RAM to upgrade my old mac but rather confuse with either selecting 6400/5300

Mactracker says my processor is Core 2Duo 2ghz Penryn and PC2-5300 (I popped the memory myself to see if it's true)

but IFixit store says that pc2-6400 compatible with : 2 GHz (Early 2009) Core 2 Duo MacBooks. I looked up several sites and it says that as long as it penryn then it'll work.

Now, having higher RAM clock seems nice but will 6400 work ? Can I use 4+2 = 6GB like what many people suggest?

My only fear is that why the original only gave me 5300


Answered! View the answer I have this problem too

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According to Apple, your Macbook supports a maximum memory speed of 667MHz, which corresponds to DDR2-5300. However, RAM is designed to be backwards-compatible speed wise, so you can use 6400 and it'll just de-rate itself automatically to 667MHz.

In other words, either will work. Buy whatever's cheaper.

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