why pci-e 2.0 8x?

S

soulliea

Weaksauce
Joined
Dec 10, 2007
Messages
100
im wondering why my video cards are running at 8x? system config is in my signature

image6el7.jpg
 
No idea. With that board it should be 16x, right?

Go into your BIOS and make sure the first two PCI express ports are set to 16x16, and turn the other two off if you can.
 
If your "crippled" crossfire setup is in the right PCIe slots (1-3), then in the BIOS under PCI Express Configuration->
GFX Dual Slot Configuration-> Enable
GFX2 Dual Slot Configuration-> Disabled
Peer-to-Peer among GFX/GFX2-> Disabled

Hope it helps. ;)
 
ok so i did in fact have my second card in the wrong slot... which explains why the crossfire links asus supplies with the motherboard are crazy long... but now if i go into gpu-z it reports the 3850 as 16x and the 3870 as 8x... any thoughts?
 
Some boards don't go full 16x on the second PCIe slot when crossfiring or sli... that may be it.
 
the 3870 is in the first slot... the 3850 is in slot 3... the mobo manual says in dual card that slots 1 and 3 are 16x...
 
answered my own question.. took off the second crossfire bridge... something tells me if u run with 2 cards linked by 2 bridges that it thinks ur in triple crossfire and drops one of the cards down to 8x... but both are 16x now so im happy...
 
soulliea said:
answered my own question.. took off the second crossfire bridge... something tells me if u run with 2 cards linked by 2 bridges that it thinks ur in triple crossfire and drops one of the cards down to 8x... but both are 16x now so im happy...
Click to expand...

Now I'm curious if you got a performance boost after this was solved. :D
 
soulliea said:
about 30 3dmarks...
Click to expand...
Whooaaa.... :eek: j/k
Throw out that HD3850 256MB, it's a joke in that beautiful motherboard. Probably it will be the fastest card if you live on the 10th floor.
And go play some games, not benchmarks.
Get a second HD3870, 'nuff said. :)
 
Considering PCI-E 2.0 8x has the same bandwidth as PCI-E 1.1 16x, and nothing has saturated that yet, I'm not surprised that there was no significant difference in performance.
 
Mithent said:
Considering PCI-E 2.0 8x has the same bandwidth as PCI-E 1.1 16x, and nothing has saturated that yet, I'm not surprised that there was no significant difference in performance.
Click to expand...

Yeah.. especially when its just a 3870 and 3850. The dual GPU cards supposedly tax PCIe 1.1, but I've not seen any conclusive benchmarks on that.
 
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