Performance impact of CAS latencies

[frontsideair]

Well, I've been looking for an answer all over internet, but I can't seem to find a decent one. I know what CAS latency is, but what I'm wondering is how much would it change my daily life computer performance if I bought a DDR3-1333 RAM with 9-9-9 or 7-7-7.

All I can find is really old benchmarks and plain explanations I've already memorized. If I can, I may request a benchmark of CAS latencies. (With same frequencies, of course.)

Thanks.

[rohcQaH]

GameStar (german PC gaming magazine) did a small test in one of their recent issues. They tested just one game and found less than 0.5% gain from the faster RAM.

That will of course depend on your CPU cache. With a larger cache, RAM speeds matter less. But you know that already

[Qaridarium]

if you need low latecy buy a opteron 6000 8-12core

thats because you have 4 channel ram on every cpu means on the unganged mode you can handle 4 diverend packages on the same time..

on an multicore app thats means 1/4 latency to an 128bit ganged dualchannel opteron 2222 for exampel!

opteron 6000 is very cheap starts at 244€ and singlesocket boards start @180€!

if you really need latency buy a Opteron6000!

[devsk]

A RAM modules certified for lower CAS may be able to overclock higher with a relaxed CAS.

[RealNC]

There's no "real life" performance gain with lower RAM latencies. You will see a gain is pure memory benchmarks though.

In other words, keep your money