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Crossfire 2 x 16x v's 2 x 8x

CaNNoN_1981

CaNNoN_1981

CaNNoN_1981

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Kinda new to crossfire at the minute and was wondering if there was a massive performance diff between running two gfx cards at 16x as apposed to running two gfx cards at 8x

eg, the DFI LanParty UT RDX200CF-DR Crossfire (Socket 939) Motherboard run 1 card at 16x but in crossfire mode both pci-e slots run at 8x were as the Asus A8R32-MVP Deluxe Crossfire (Socket 939) PCI-Express Motherboard runs both pci-e slots at 16x in crossfire mode, would just like to know the performance diff, ta.

CaNNoN
 
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Which Ati cards have you got - as far sd I know none of them yet max out the bandwidth on the 8x slots so you shouldn't have any problems. If you've already got the cards and the mobo - run some benchies and compare them on Orb to see how it's going - should give you an idea how it's going.
 
Read a review of the avr (2 x 8) vs avr32 (2 x 16) and it's about 3-4fps at hi-res (1600x1200 up).
 
Yeah the RDX200 is dire for crossfire, old RD450 chipset, horrendous southbridge, it was really for the x8 series, but was released to late, the best old RD450 Crossfire board is the Asus A8R MVP, has the same old chipset, but has the much better ULI Southy, and it completely destroys the RDX200 at Crossfire, as said above only a couple of frames in it between it and the new RD580 chipset. :)
 
I don't think they'll work on the old Chipset boards like the RDX200 if thats what you mean, only the RD580 boards and up can do the new Crossfire2 of the x1950pro's etc...
 
LoadsaMoney said:
I don't think they'll work on the old Chipset boards like the RDX200 if thats what you mean, only the RD580 boards and up can do the new Crossfire2 of the x1950pro's etc...
Click to expand...
Oh so the RDX200 wont even run 2 X1950 pro's?
 
LoadsaMoney said:
Yeah the RDX200 is dire for crossfire, old RD450 chipset, horrendous southbridge, it was really for the x8 series, but was released to late, the best old RD450 Crossfire board is the Asus A8R MVP, has the same old chipset, but has the much better ULI Southy, and it completely destroys the RDX200 at Crossfire, as said above only a couple of frames in it between it and the new RD580 chipset. :)
Click to expand...

the "ULI southy" was an utter POS, mega thread over at dfi, asus forums about that board and the ATI 3200 that also used the ULI, far as im concerned the a8r32-mvp pretty nasty mobo glad to be shot of it im sure the a8r-mvp is no better. as for the pci express lane speeds im using crosfire in 8x and 4x mode, on the ASUS P5B Deluxe, ati has actually made it so with 6.10 driver there is practially no performance dip whatsoever and they have got the p5b deluxe to run crossfire on par with the p975x running at 8x 8x with a few nifty driver tweaks theres been no loss. Pretty impressive i think check my 3d Mark scores which actually score better than the p975 ;).
 
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