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crossfire in a x4 PCIE slot?

post #1 of 23
Thread Starter 
Hi, I was always under the impression that the x4 PCIE slot on my motherboard was less than useless. That if I tried to crossfire with it my performance would actually be WORSE than with 1 card. But then i found this: http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/7.html

according to the tests they ran with crysis and Far cry 2 (Its old i know) the difference in an x4 slot and a x16 slot was minimal, within 10% loss with the x4 roughly. So can I really xfire well with my x4 slot?
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post #2 of 23
The loss from going from X16 to X8 is about 2FPS, The loss from going to X4 is about 6ish. But if your card is PCIe and your motherboards doesnt support it, You lose a further 2FPS, so the loss starts to stack up quickly. Also it wouldn't worth since the X4 slot doesn't pull as much power as the X16, and if your card doesnt use a power connector it probably wouldn't work. And the on es who use it may not have extra power connector just for fun to compensate for the 75w from the X16
     
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post #3 of 23
Quote:
Originally Posted by Pedroc1999 View Post

The loss from going from X16 to X8 is about 2FPS, The loss from going to X4 is about 6ish. But if your card is PCIe and your motherboards doesnt support it, You lose a further 2FPS, so the loss starts to stack up quickly. Also it wouldn't worth since the X4 slot doesn't pull as much power as the X16, and if your card doesnt use a power connector it probably wouldn't work. And the on es who use it may not have extra power connector just for fun to compensate for the 75w from the X16

Where do you get your numbers from? Just curious.
    
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post #4 of 23
Those are synthetic tests on an x4 slot thats not really an x4 slot. It's a gpu that's limited to x4 on an x16 slot, it's obviously not the same as a real x4 slot that is going thru the southbridge.



http://www.overclock.net/forum/newestpost/1361427
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post #5 of 23
Quote:
Originally Posted by daydream99 View Post

Where do you get your numbers from? Just curious.

I read them a while ago and they just come to me now and then. I had to put some inco consideration for my build next week so they were quite fresh in my mind. What do you think? It would need lots of custom cables and custom power being fed etc
     
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post #6 of 23
Quote:
Originally Posted by Pedroc1999 View Post

The loss from going from X16 to X8 is about 2FPS, The loss from going to X4 is about 6ish. But if your card is PCIe and your motherboards doesnt support it, You lose a further 2FPS, so the loss starts to stack up quickly. Also it wouldn't worth since the X4 slot doesn't pull as much power as the X16, and if your card doesnt use a power connector it probably wouldn't work. And the on es who use it may not have extra power connector just for fun to compensate for the 75w from the X16

Those figures are wrong I struggle to believe they are anything other than made up. You can't state losses as FPS figures like that unless you talking about 1 model of card, meaningful loss figures should be in percentages saying an X4 slot loses 6FPS would mean nothing if you are using a high end card!

Also I may be wrong here but I'm reasonably sure the power delivery in any full length PCIe slots is equal irrelevent of the number of lanes (the physically smaller slots have lower delivery)
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post #7 of 23
Thread Starter 
Quote:
Originally Posted by WR6133 View Post

Those figures are wrong I struggle to believe they are anything other than made up. You can't state losses as FPS figures like that unless you talking about 1 model of card, meaningful loss figures should be in percentages saying an X4 slot loses 6FPS would mean nothing if you are using a high end card!

Also I may be wrong here but I'm reasonably sure the power delivery in any full length PCIe slots is equal irrelevent of the number of lanes (the physically smaller slots have lower delivery)

It's a full sized slot, my card fits into it. Maybe I'll plug it in to the x4 slot tonight and see what kind of performance I get.
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post #8 of 23
A number of boards have x16 and x4, so it's likely to work fine, not the absolutely optimal set-up, but it should work.

IMHO.

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post #9 of 23
Thread Starter 
Quote:
Originally Posted by 2002dunx View Post

A number of boards have x16 and x4, so it's likely to work fine, not the absolutely optimal set-up, but it should work.

IMHO.

dunx

Thanks ill try the x4 slot tonight. I need a good, solid for sure answer for this because i want to xfire my 6850 and the only place that still has them is Amazon. So it it doesnt work i cant really return it so im out $150 that could have gone to something useful like food or rent.
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post #10 of 23
Please report back
     
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