M1keMK said:
This is exactly what Ive been wondering about. Ive got my C5 to 800mhz 4-4-4-15 now so far, but as soon as I approach 900mhz at 1T i get BSOD at desktop. Just wondering if rated timings are rated for 2T or 1T, or if its a mobo issue.
Those rated timings are not for 1t . 1T only came in to action for ddr2 with 680i. So they are for the default of 2t. Even with 680i if you want 1T you have to stay way below 900mhz. I would think 850mhz is about right. To go higher you would need crazy voltage. At a guess to get 1000mhz 1T you would need about 2.7-2.9volts. The board nor the ram will be very happy there. Nobody has managed to get 1T at 1000-mhz, including the Kingpin ( 24k orb) .
If you your goal is maximum cpu speed, then stick with 850mhz 1T. If you want maximum memory bandwidth then 1110mhz and above at c4 (2T) will start beating 850mhz(C3) at 1T, but you will sacrifice maximum cpu speed to do that. At 1200mhz (c4 or c5 here)you will be way ahead of the 850mhz 1T. I think the core2duo prefers higher speeds than tighter timings, but thats not to say that 1T doesn't do anything, it most certainly does.
By the way to get the maximum memory overclock on 680i boards you would need to do this...
1. Set sli ready memory, let it select your epp settings which I assume is 1000mhz , 5-5-5-15
2. Now goto the place where you set your fsb etc. Goto sli overclock, and set it to expert. Now you can play with the fsb and memory with a better starting point, and better optimizations.
3.The board will default unlinked when you do this, but you can change if you want, but I keep it at unlinked.
4.Now I simply choose my memory speed, and fsb directly, making sure that I choose a common ratio as even though it's unlinked it really is just crazy dividers. So do something like 1066mhz fsb and 1066hz memory (4-4-4-12) with 2.4v, or 1600mhz fsb and 1066mhz memory. May have to play with this to get the sweet spot. Your board is unoptimized at the moment with it.s release bios, so it's more than likely you will have similar problems to what evga had with the intial bios, so that means no go areas with fsb, stuck memory speed etc. Sometimes you will find that say you get unstable at 333mhz fsb but 350mhz is fine.
5.Now reboot, and do your stress testing. Works every time.
PS> Have you done sli yet? I am curios if your board gets that sli sound issue that everyone had with initial 680i. Play some FEAR or Oblivion to test this.
FLANNO: If you can get to 1080mhz or so with 4-4-4-12 2T (needs 2.4v) then yes , it would be faster by a bit. From there the more speed you add the the larger the delta becomes , providing you can stay at c4. With C5 you would need a lot more speed, say about 1200mhz to really smash 850mhz 1T, This is why most folks prefer 850mhz 1T ,as it's easier to manage on a 680i board. Use super Pi to test ho much faster it is (or not)or the equivalnet.