2009 8GB RAM upgrade 256/512MG? Help!

[palmskinny]

Im going to upgrade my late 2009 unibody RAM to 8gb but on Crucial website they sell the:

8GB Kit (4GBx2), 204-pin SODIMM, DDR3 PC3-8500 memory module

This is the correct one but it comes in 256meg x 64 and 512meg x 64. Which one is correct and if both is the 512 worth the extra? Whats the difference?

Any help is much appreciated

 

[MisterKeeks]

Can you get us a link?

 

[palmskinny]

http://www.crucial.com/uk/store/partspecs.aspx?IMODULE=CT2KIT25664BC1067

Ive got a macbook white unibody 2.26ghz late 2009

 

[logana]

That link is for a 4GB kit (2 x 2GB sodimms) and Crucial don't appear to know that your MacBook will run 8GB....

This is the ram you need http://www.crucial.com/uk/store/partspecs.aspx?IMODULE=CT2KIT51264BC1067 though you should be able to find for less than £30 fairly easily. I have used that ram in a 2010 MacBook Unibody 2.4 so you should not have any problems

The 256meg and 512meg specs are just a description of the size of the individual chips on the ram module and for your purpose is really irrelevant

What you need is 2 x 4GB DDR3 PC8500 modules - faster modules will be cheaper but your machine will probably not boot with anything faster (some do, some don't) so not worth the risk...

Try http://www.amazon.co.uk/Crucial-Sodimm-Laptop-Memory-Upgrade/dp/B001MX5YWI/ref=sr_1_4?ie=UTF8&qid=1356651792&sr=8-4

since nearly all the reviews are from Mac users (MacBooks, MacBook Pros, iMacs etc)