# Correct computations on math for memory?

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November 30, 2011 12:59:35 AM

Ok so i did some computations on the memory to determine what would be a faster setup. Am i correct?

im comparing this:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

G.SKILL Ripjaws Series 12GB (3 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666)
with timings of: 7-7-7-21

to this:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CORSAIR XMS3 12GB (3 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
with timings of: 9-9-9-24

Now finding that T(time)= 1 / frequency i find that for the GSkill i get:

T = 1 / (666 x 10^6) = 1.5 ns
then to get actual operational time you add up T + tCL + tRCD + tRP
So thats
1.5ns + 7 + 7 + 7 = 22.5ns total access time with 1t it would be 22.5ns still or 23.5? And 2t 23.5 or 24.5?

Now for the Corsair:

T = 1 / (800 x 10^6) = 1.25ns

1.25ns + 9 + 9 + 9 = 28.25ns total access time, same 1t is 28.25 or 29.25 and 2t is 29.25 or 30.25?
25

so going by this assuming my math is correct, it is actually faster the have the gskill ram than the corsair even though it is rated at a lower frequency? so the gskill would be better for my performance than the corsair would be?
a c 128 } Memory
November 30, 2011 11:00:59 AM

They're about the same overall speed. The reality is that all ram runs with faster timings if you slow down the speed. That's why I won't pay more for premium ram.
November 30, 2011 11:31:17 AM

Ah that is true, very good point. I guess the deciding factor now is what ram will fit in my computer but I could always switch it to the 2nd 4th and 6th slots so it wont hit my cpu cooler.
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