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fuegonian said:
How much better/faster is 'cas' 4 than 'cas' 5 ram?

I don't know if that question makes sense!

5-5-5-18 = 'Cas' 5.

My brother said i should get 'cas' 4 but i couldn't find any in the computer stores near me, so i got 'cas' 5.

 

I dont think that will make a difference. The biggest difference is the ddr ( such as ddr, ddr2, ddr3, then it is the speed such as (333 400) and then the cas. it shouldn't make a big difference.