Hmm maybe someone here will know

[Nemesis3]

Someone suggested I set 2.5Cas crucial ram to Cas2 instead of buying cas 2Corsair ram.

Does rated cas 2 ram perform no better than rated cas 2.5 ram set at 2.0? If you can set 2.5 to 2.0 why even have 2? Are there any advantages to cas 2 listed ram?

What is involved in running the crucial 2100DDR Cas 2.5 at cas 2, simply setting it to cas 2 in bios?

 

[Slikkster]

Cas2 is Cas2...so speeds should be equivalent when both are set that way.
Yes, set it in the bios and that's all there is to it.

As to why would you buy Cas 2 Corsair vs Cas 2.5 Crucial, the difference is that Corsair is telling you that they are rated to perform at Cas 2.
Crucial's not making that claim, even though chances are you can run it safely and with stability at Cas 2.

Ya pays your money and ya takes your chances, as the saying goes. In other words, it's a matter of cost, and no absolute guarantee that Crucial will perform at Cas 2.0, but chances are it will. Personally, I think the difference in performance would be fairly negligible at Cas 2.0 or Cas 2.5. Just my opinion.