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Crossfiring with PCi x4

post #1 of 19
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I'll get straight to the point, I have two Radeon 4870 cards in my possession. Ordinarily I would Xfire them and call it done, but even though my motherboard advertises as Crossfire capable, it actually only has one x16 slot, the other being x4. I'm currently soliciting opinions on how well this scales. I'm aware that the performance of the second card will be less than optimal, but how much less? I'd have to buy a new power supply to Crossfire, so I'd just like to make sure that my money wouldn't be better spent on something like a Solid State drive. I have googled it, but I could mostly just find a bunch of stuff on crossfiring x8-x8, not x16-x4, so if anyone has information they'd like to share, I'd love to hear it.

The system I'm putting it into is using a Biostar A880 with an Athlon X2, a 500 Watt PS, and 8GB Ripjaws clocked a little over 1600.
post #2 of 19
Here's a pretty informative video about bandwidth with pci-e slots:
post #3 of 19
x4 2.0 is plenty for a 4870
    
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post #4 of 19
Quote:
Originally Posted by Vlasov_581 View Post

x4 2.0 is plenty for a 4870

yup you shouldnt have any issues
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post #5 of 19
Quote:
Originally Posted by doctrgiggles View Post

I'll get straight to the point, I have two Radeon 4870 cards in my possession. Ordinarily I would Xfire them and call it done, but even though my motherboard advertises as Crossfire capable, it actually only has one x16 slot, the other being x4. I'm currently soliciting opinions on how well this scales. I'm aware that the performance of the second card will be less than optimal, but how much less? I'd have to buy a new power supply to Crossfire, so I'd just like to make sure that my money wouldn't be better spent on something like a Solid State drive. I have googled it, but I could mostly just find a bunch of stuff on crossfiring x8-x8, not x16-x4, so if anyone has information they'd like to share, I'd love to hear it.

The system I'm putting it into is using a Biostar A880 with an Athlon X2, a 500 Watt PS, and 8GB Ripjaws clocked a little over 1600.



Crossfire @x16 and @X4 is a big NO.

 

 
 

 

 

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post #6 of 19

i have 2 different rigs running very similar motherboards with x16 x4 and don't have any performance hits rolleyes.gif
    
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post #7 of 19

Oh really laugher.gif

 

Have details to share?

 

Motherboard:

CPU:

VGA cards:

PCIe Slot number:

Resolution:

Application: Folding or Games?

 

Elaborate "no performance hit".


Edited by Ken1649 - 3/25/12 at 8:58pm
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post #8 of 19
Should work fine since the 4870's arnt high bandwidth requiring cards.
Also 500W should be enough power for 2X 4870 and a Athlon X2.
post #9 of 19
rig 1 - 960T unlocked to 1600T @4.0GHz, MSI 870-G54, 4GB DDR3 1600, 4850CF
rig 2 - FX6100 @4.8GHz, MSI 870-G54FX, 4GB DDR3 1600, 5770CF
    
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post #10 of 19

 

Quote:
Originally Posted by bmgjet View Post

Should work fine since the 4870's arnt high bandwidth requiring cards.
Also 500W should be enough power for 2X 4870 and a Athlon X2.


Is that opinion or fact? If it is fact, what is determining bandwidth requirement? Card model?
 

 



Quote:
Originally Posted by Vlasov_581 View Post

rig 1 - 960T unlocked to 1600T @4.0GHz, MSI 870-G54, 4GB DDR3 1600, 4850CF
rig 2 - FX6100 @4.8GHz, MSI 870-G54FX, 4GB DDR3 1600, 5770CF


 

Running what applications and resolution or it's not for gaming? Care to share?
 

 

 

ケンジ
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ケンジ
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120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
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