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P35 Crossfire

post #1 of 22
Thread Starter 
I have a p35 mobo with a x16 and a x4 pcie slot.
would it be worth getting to 3850s or would the x4 bottleneck the other card too much and even slow the whole setup down?
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post #2 of 22
It will bottleneck it a little bit, but you will still see improved performance. 4x still offers quite a lot of bandwidth I believe.
post #3 of 22
Quote:
Originally Posted by willbushby View Post
I have a p35 mobo with a x16 and a x4 pcie slot.
would it be worth getting to 3850s or would the x4 bottleneck the other card too much and even slow the whole setup down?
It would just badly bottleneck the second GPU. And there's no telling if that will result in less, the same, or more FPS.
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post #4 of 22
Quote:
Originally Posted by mrtn400 View Post
It would just badly bottleneck the second GPU. And there's no telling if that will result in less, the same, or more FPS.
With a 3850 it shouldn't be much of a bottleneck at all. You'll still get a huge performance boost.
post #5 of 22
Even if the second card's bottlenecked, the frame rates will still be higher than having just 1 card, wouldn't it?
After all, there's still a second card there, just not at full throttle.
post #6 of 22
Yes, with the 3850 it should just cut the mustard and give you some extra performance.

But the X38 boards allow the card some room to breathe and maybe squeeze through that extra data.
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post #7 of 22
x38 chipset has better perfomance than P35 even when you use one single Graphic card.
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post #8 of 22
1. With a 3850, you shouldn't see much if any difference between performance on an x4, x8, or x16 slot. An x8 is good enough even for mid-high end cards like 8800GTS. x16, and 2.0, are mostly a matter of waiting around for hardware that uses them.

2. X38 isn't really any better than P35, it just has more PCI lanes for superfast cards. I wouldn't use a 3870x2 in a PCIE x4 slot. X38 may or may not overclock better (opinions differ) but it doesn't "perform" better.
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post #9 of 22
with my single 8600gt overclocked on a 4x lane, i got 5200 on 3dmark06, now with the 16x slot im getting 6500, so you tell me if it matters...
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post #10 of 22
Quote:
Originally Posted by jpark59 View Post
x38 chipset has better perfomance than P35 even when you use one single Graphic card.
Wrong.

X38 = P35 with two x16 lanes.

They have the same performance.
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