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Cas Latency

post #1 of 8
Thread Starter 
So i read the FAQ and main post, and it says 2.0 is better then 2.5 which I get lower is better.


Then why is the gaming/higher end memory 8 and 9 CAS-L?

and it 7 better then 8 better then 9? (7>8>9)?
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post #2 of 8
Because DDR2 and DDR3 have different latency thresholds, you DDR2 runs at a much lower speed than any DDR3 kit and therefor can have tighter timings.
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post #3 of 8
ram that is cas 8 or 9 is often DDR3 which run at 2000Mhz+

the extra speed makes up for the looser cas ratings and makes the ram actually faster.

and btw 2.0/2.5 for cas are settings that you would find with regular DDR ram
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post #4 of 8
Yes. 6 is really tight, 7 is tight, 8 is fine, 9 is the norm.
There are some ddr3 1333 cas 9 and some DDR3 2000 cas 6.
Sometimes it doesnt worth the extra money to go from 8 to 7

I remember buying THE kit. 2x2 DDR3 2200 cas7
I ran them @ 2000Mhz cas 6 for months.
I still paid 175$ for em xD
I do not think it is important anymore, since I barely saw any difference from my old 4gb ddr3 1600 kit.
post #5 of 8
Lower CAS will always be better than higher CAS as it's a latency, higher end kits need to have higher latencies because they run at an higher frequency, some applications benefit more from raw bandwith memory (so frequency) than they do from tighter timings (CAS), but they're becoming a minority, most games for example will run a bit better with a 1600MHz CAS 6 than with a 2000MHz CAS 9 kit.

Of cours those higher end kits can most of the time be downclocked to use tighter timings, but I say just buy a cheap 1600MHz CAS 7 (or even 6 if you can still find them) kit, especially if you're mainly gaming on your system, the expansive kits aren't worth it.
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post #6 of 8
The lower, the better. In high end RAM, the high speeds make up for the latency.
Edited by HybridCore - 6/1/11 at 1:17pm
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post #7 of 8
G SKill makes some nice 1600 mhz ddr3 with a cas 6 latency for around $80 on newegg.

Link: http://www.newegg.com/Product/Produc...82E16820231351
Link 2: http://www.newegg.com/Product/Produc...82E16820231444
post #8 of 8
Quote:
Originally Posted by HybridCore View Post
The lower, the better. In high end RAM, the high speeds make up for the latency.
Not always true
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