I dont know what the result will be with a newer chip, but my 780i chipset had a huge VDroop. (.06 at normal volts, up to .08 at 1.5ish.) That blows for over clocking, because you'll have to crank the bios VCore higher by several notches, just so it can droop under load by a huge amount, to get the target loaded voltage.
For instance, my maximus formula costs about the same, but can be set only so the effects of vdrop, (Exactly .02500 on my Formula) Is seen. So lets say I wanted my q6700 to be prime stable. It takes 1.45 volts @ 3.8 PRIME stable while loaded. (Go try 3.8 Prime stable on a q6x00 and see how hard it is and still stay under 1.5 vcore.)
Where was I, oh yeah... On my formula I already know that with LLC enabled there is no vdroop. So I need exactly 1.47500 in my bios. Dropped to 1.45 volts in windows, and since I dont have a VDroop, there ya go!
But on the 780i chipset... you get the initial vdrop (bios selection to windows.) And then to test, its gonna droop while loaded by .06 - .08 in windows. (vdroop.) So in order to reach the same 1.45 LOADED volts, I'll need to add like 7 notches. So its something like 1.52500 will be 1.5000 in windows, and then droop to 1.43xx and K-Boom! Wouldn't be stable.
So it looks like it would need 1.5500ish to get the same stability. While My formula because of its lack of droop only needs 1.47500 in the bios. Thats a big difference, and it matters because though you are prime stable, you are gonna waste cycles all day long yet have an idle voltage of over 1.5200! Even though it only needs 1.45V while loaded to remain stable. See the waste?
I idle at 1.45 and load to 1.4508! (LLC actually corrects VDroop to the plus side, lol! Yippie!)
An 780i would need to idle at 1.5200ish, simply because it droops under load by soooo damn much!
Dunno if thats on topic! But will prolly help someone! To bad intels SLI/Xfire hybrid is a socket 771! Waaaahhh!!!
The cooler will hold, the RAM is the only thing I'd be a bit worried about. I did the same with my e8400, went with PC6400 thinking it would OC enough for 4GHz... just my luck that I get RAM that really, really doesn't like going over 410MHz, so I'm "stuck" at an incredibly conservative 3.6GHz.
At least it's running very cool at full load with the 9700CNPS, with extremely tight RAM settings (yeah, even way loosened up, the RAM wouldn't budge over 410MHz...)
Still extremely happy with this system, utterly destroy my old 4000+
1066MHz is the next best step, so PC-8500 with standard timings (5-5-5-15); the extra 400MHz outweighs the 1-1-1-3 timing loss, especially considering the price difference is about 10-15$ VS the PC-6400 4GB kits.
I personally let go of Corsair this time around, their prices are through the roof around here for no real reason. Gave a go with Patriot and so far so good, and their Viper kits are pretty damn cheap.
780i, 800 is prob middle of the road (maybe the bottom)...should be able to use 1066. I have 1066 in my P35 board...older chipset than the 780i's. 800 or 1066 would do you well, unless you are meaning DDR3...which is outlandishy expensive.
You can always do 6-6-6-18! But just try the 5-5-5- make it 15, and see how far you can push it. Prolly reach 900 Mhz or so. So yeah, play with it, and if it doesnt do what you wanna do, go for the PC 1000 stuff.
Its just a tad cheaper than 1066. Or get some OCZ 4-4-4-12 800, and loosen it to 5-5-5-15. Should make what you need.
Uhh, Okay JonyB, You do realize that the ram is prolly the exact same chipset, yes? Its 5-5-5-12 and not 4-4-4-12. Thats because they loosened the timings. The same exact thing you could do.
I would get the 4-4-4-12, and hope at your wanted speed is still stable! (In other words you can loosen the 4-4-4-12 to 5-4-4-12 and it would prolly work at 900 Mhz.) BUT at the worse, you get the same 5-5-5-12. So whatever is cheeper. And it appears that the 4-4-4-12 would prolly do better at 900 Mhz than 1000 at 900.