Originally Posted by Shield
RAM: 6g (3x2gb) Corsair Dominator-GT 2000MHz PC3-16000 CL8 (8-9-8-24) (Under evaluation due to the 2000MHz not being utilized properly...although I was planning on OC'ing these)
I would like to provide some insight on this if you don't mind. I also have the i7 950 and I think if you look around a lot on these forums and a few others, people mention they can't stably run 2000mhz ram, because the uncore requirement for their IMC is way too much stress, and requires a large amount of QPI/VTT voltage to stabilize.
To give you an idea of what my i7 needs for 24/7 2000mhz (4ghz uncore), well, its about 1.48QPI/VTT, which seems way above what people would recommend for 24/7 safe use.
Of course all i7's are different and have different IMC's and different capabilities in terms of what uncore frequencies they can do at different voltages, but this seems to be a common occurrence with many new i7 950's, including my very own. 4ghz uncore is just way too damn much it seems.
Keep in mind, higher uncore is more then possible with more QPI/VTT, but if you intend on running 2000mhz 24/7 just keep in mind you may need quite a large amount of QPI/VTT voltage to stabilize your system. The more voltage you giver, the more uncore it will put out, but again, you don't want to give a lot of QPI/VTT for 24/7.
When I asked around, most people said they wouldn't use more than 1.45 max QPI/VTT for 24/7.
However, don't let this discourage you from buying 2000Mhz ram
. I would in fact, recommend that you see what those sticks can do at 1600mhz, because the beauty of buying "higher binned" ram, is that even though you may not be able to run them at spec, you can often do tighter timings at lower speeds. (my 2000cl8 let me do 6-6-5-16-1T 1600 for example)
Maybe you can get 6-7-6-20-1T out of those kits, but im not 100% sure, never worked with that ram. I would look into that.
Or if under clocking your ram isn't your thing, then there are plenty of 1600mhz kits out there that can do damn good timings (ridgebacks for example). It just seems like a gamble to get 2000mhz ram on an i7 950 to run stably without a preposterous amount of QPI/VTT, but that's based off the threads/posts I have read on various forums and my own experience, so take it for a grain of salt, but that's the only advice I can offer you on your build.
Not everyone has this issue, that is 100% true, but its still an issue for quite a few i7 950 owners, so I just thought you should be aware of this when buying 2000mhz ram, as I think anyone in the market for high speed ram should be aware of the requirements it may need from your CPU's IMC.
Hopefully this actually helped you when it comes to buying ram and will help make your choice easier about 1600vs2000 etc).
Looks good so far. Just make sure you check Noctuas website about potential clearance problems with whatever ram kit you plan on buying.
Good luck!Edited by dTT05 - 2/3/11 at 5:13pm