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PCIe x16 vs x4 mode for single HD6850 question...

post #1 of 5
Thread Starter 
Looking to move my card to the lower slot but its rated at x4 bandwidth. I'm not that familiar with the specifics and think I'd be ok, but I'm not 100% sure. I'm thinking I can get a bit better air flow and get more air from the side 230mm to the VRM's.

I know you will see a very small difference on high end cards, but will my 6850 use enough bandwidth to be starved by the x4 lane? Or will it run fine. I'm ok with something like a ~3-5% performance drop, which is what I was seeing on the 6990 info I found, but I figure my card is far from 2 6970's, and not running the GPU at x2 (Dual GPU card in x4 is x2/x2 for bandwidth right?)

Just want confirmation or some info if there will actually be a problem.
M06
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M06
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post #2 of 5
i say just try it and see what you get. i dont think you have anything to lose tongue.gif
post #3 of 5
Shouldn't be more than 4%. That's what the difference was for me when I had two 470s, with one in the 4x slot, other in 16x. You will only notice the difference in benchmarks.
post #4 of 5
I believe Tom's has an in depth review of the performance hit.
AMD cards are affected more negatively than NV cards.
In some cases it was as much as a 30% hit, on avg though, ~10%
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Mighty-iTX
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by AhmedFromKSA View Post

i say just try it and see what you get. i dont think you have anything to lose tongue.gif

I was hoping to skip all that as I don't have much time and I have a nerve problem, so getting under the desk and such can be a bit of a hassle.
That, and I'm lazy tongue.gif
Quote:
Originally Posted by grunion View Post

I believe Tom's has an in depth review of the performance hit.
AMD cards are affected more negatively than NV cards.
In some cases it was as much as a 30% hit, on avg though, ~10%

I tend not to listen to whats said on Toms very often... Like above said, I saw most info saying ~5% or less. Even Linus testing a 6990 on an x4 lane (x2/x2) didn't take much of a performance hit.

I'd like some hard info if anyone has it. Otherwise, I guess I'll wait till sometime next week and give it a shot myself, just wanted to avoid that heh.
M06
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M06
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Hard DriveHard DriveHard DriveOptical Drive
WD Blue 500GB WD Black 1.5TB Crucial M4 128GB (OS) LG ODD 
CoolingOSMonitorMonitor
Deepcool Lucifer v2 Win7 Ultimate 64 bit Acer X223w (1050) LG 22EN33 (1080) 
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Sharkoon Tactix OCZ ModXstream Pro 700w Modular Corsair 300R CM Storm Xornet 
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