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Q9550 on 750i potential?

post #1 of 12
Thread Starter 
I've been planning the move off my sig rig when IB is out. I'm thinking to move the Q9550 on my sig rig onto the 750i FTW machine linked below (E8400@4.3) but I don't know how the NV 700 chipset is with 45nm quads. It has GTL settings, but only to move positive. I would stick with the UD3P but I'm using SLI and don't want to use the hack and have to put up with driver issues.

Anyone have any experience with 45nm quads on NVidia 700 chipsets? I'd be happy if it made 4.0.
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post #2 of 12
it'll work, but in my opinion, id rather the GA board with the q9550. the 680/780 chipsets are decent, but the 50 left more to be desired.
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post #3 of 12
What you gain in SLI you lose in CPU potential. Even at the same clocks on a UD3P, the nVidia chipset is going to nerf your gflops. It just doesn't perform as well as an intel chipset, but you do get SLI.
post #4 of 12
you will get close to the 4ghz mark. I have the q9550 and have it up to 3.95ghz but my mobo has a fsb wall that I cant overcome even though I have plenty of room voltage and heatwise.

The 750i will net about the same results on the quad netting about 475mhz fsb before it hits a wall.
post #5 of 12
471MHz FSB on a C2Q w/ 750i? Hardly..

CHEERS..
     
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post #6 of 12
I wouldn't bank on getting the 750i's FSB close to the UD3Ps, so unless you're willing to sack a higher clock for an official SLi board I'd pass.

Why not just go for the SLi hack on your UD3P ?
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post #7 of 12
Thread Starter 
FSB: I have had it at 500*9 with the E8400, benchmark stable but not stress test stable. (I never tried with a lower multiple, maybe I should just to see). It can do 489x9 stable with the E8400. 470 is no problem for the board right now (that would be 4.0 on the Q9550), it does 478 daily, but I've never had a quad on it so thanks for all the input.

SLI vs UD3P: I hear what you're saying, I could downclock to 4.0 on the UD3P and use stupidly low voltage, move to the H5O that's on the 750i and hack the SLI. I hack SLI on the Q6600/X48 below and I always have to trial-and-error drivers. It's a pain.

SO....basically I could expect maybe 3.8-3.9 realistically? I could live with that but lol I would feel bad running that chip at *only* 3.9
Edited by 2thAche - 5/9/11 at 12:07pm
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post #8 of 12
With the 750i you can expect 3.8-3.9ghz without any issue. Getting to 4ghz+ is where it all depends on where the FSB wall is on your specific mobo.

I have seen members here with 750i and 780i have a much higher fsb wall than 475ish range, but it is few and far between. A majority of them hit the wall around 475ish mark.

I have seen threads from some OCNers that have done pencil mods which helps regulate the vdroop and they were able to push past the fsb wall, but they ran pretty high volts iirc. You would have to search the OCN archives to find the posts though. I am content running mine at 3.95ghz and being able to run SLI without hacking the mobo.
post #9 of 12
Thread Starter 
Thanks Aawa. I guess I can throw the chip on there and see what it can do. It's running a single GTX260 with another coming in the mail. Honestly, if it does 3.8 on the H5O I'd be content with that. Then I could sell the UD3 to someone who will put it to good use.
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post #10 of 12
750i FTW doesn't do to well with 45nm quads past 4.0......for that you'll need a 780i FTW.....i know people say it's only an extra pcie slot, but from my experience the 780 is better with them.....also everytime i did that vdroop pencil mod, first it fried one of my E8400s because it defaulted vcore @ 1.9v, and it keeps ram voltage locked @ 2.35v for some reason
    
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