pci-e; 8x vs. 16x ?

[wadec22]

So I have a DFI N4 Ultra-D S939 mobo. There are two pci-e slots. The one near the cpu runs in 16x, the one furthest from the cpu runs in 8x. I just received my new 8800 gts and the thing is so big, I had to put it in the 8x slot. In the 16x spot, the chipset hs/fan gets in the way. My question is, does anyone know (please try and hold back on speculation) if there is actually a real world performance difference? I know PCI-E bandwidth is far from filled these days.

 

[AmongTheChosenX]

there was a Toms hardware (or maybe an anandtech review) that stated there was very little difference. I doubt you would see any real world difference anyway.

http://www.tomshardware.com/2008/01/23/crossfire_meets_pci_express/

there you go.

 

[wadec22]

that article was exactly what i was looking for. thanks.

 

[chikinini]

I was just thinking of asking about this too. I have a i975x mobo. I was planning on having the 3850 on the first slot and 3870 on the second slot.

Would there be a difference if i put the other way around? I understand both would run 8x anyway with crossfire enabled.

Thanks for the link too.

 

[-div-]

I was just thinking of asking about this too. I have a i975x mobo. I was planning on having the 3850 on the first slot and 3870 on the second slot.

Would there be a difference if i put the other way around? I understand both would run 8x anyway with crossfire enabled.

Thanks for the link too.

Shouldn't be a difference. xfire will run your 3870 at 3850 speeds and only access 256mb from the 3870.

 

[chikinini]

Ok, Thanks. I'm installing it now.