The response time of CAS5 is slower, it requires 5 cycles to initiate transfer.
Anyway, any PC2-6400 has 800MHz data rate and runs at 400MHz clock, Core 2 Duos run at 1066MHz data rate and have 266MHz clock, so for overclocking you can drop the RAM speed and raise the CPU FSB while loosing little to nothing in memory performance.
Because of dual channel mode, PC2-4300 is fast enough to perform well with stock FSB1066 processors, so any PC2-6400 leaves lots of room for CPU overclocking so far as you keep memory speeds below 800
Not true...Loose timing actually helps overclocking stability
You mananged to turn a true statement into a false statement! LOOSENING your timings helps make memory stable when overclocking. That means setting CAS5 for CAS4 rated RAM, etc.
This is a true statement, tigher timings are always better @ stock, but when your oc'ing if you loosen the timings it puts less strain on the ram so its more stable, so you always want to go with the tightest ram you can, that way, if you decide to lossen up the timings the performance loss isnt as bad.
like lets say you have some 5-5-5-15 ram, and lossened it up to 6-6-6-16, then compared it to ram with timings lossened from 3-3-3-13 to 4-4-4-14, you turned the timings up by the same amount, but the stuff with tighter timings to begin with comes out ahead. there are other reason for buying ram with tighter timings, but i wont go into there right now.
does that make any sence? im kinda tired right now. :?
the info is valid, but the wording might be a little off. for the past 6 hours ive been pounding coffee and listening to envy (a hardcore rock/screamo band from japan) at 120+ DB to stay awake.
Well, deadlydude wanted us to believe that memory rated for CAS5 overclocked better than memory rated at CAS4. He was speaking of ratings, not manual settings.
I spoke poorly...I just wanted to say that LOOSENING the timings (manually) helps stability in an over-clocked system. Tighter rated timings are better performers. There is a good article here concerning how much performance increase there is: http://www20.tomshardware.com/2006/03/31/tight_timings_...