PCI-E 2.0 vs PCI-E Gen2


Sep 24, 2011
Hi all!

I'm trouble finding information explaining what it is and what it can do for me and also what's the diference between

"PCI-E 2.0" and "PCI-E Gen2"

because I'm looking to SLI a 'MSI N580GTX Lightning Xtreme Edition' card and since I have a 'MSI 990FXA-GD65' mainboard which on the specs says:

PCI-Ex16 2
PCI-E Gen Gen2 (1x16, 1x8)

I'm concerned that if I SLI the cards will run at 8x and not 16x.

Could you help understand it ?
Hmm.I had the 890FXA-GD65 and it could do x16/x16.They are practically the same board except for SLI support and voltage changes for the CPU but I don't see why the 990FXA can't do x16/x16.It might be SLI related but i'm not sure.

Either way you won't be able to notice a difference between x8 and x16.The performance loss is only around 10%.
whatever, the 8800 ultra, GTX 580 use the same PCIE 2.0 standards...
and benchmarks indicates that there's a slight difference in performance isn't noticeable unless you run a 3D Mark or something like that .. you get more bunch of numbers...
Just for future reference the GTX580 is a much more powerful card than the 8800 Ultra.Which means that it has a lot more bandwidth.Technically it would be more hampered by the x8 slot than a 8800 Ultra but still the difference of a x16 and x8 slow is very minimal.


i'm just laughing out loud, did you read my post above ? i said " there's a slight difference that isn't noticeable is 3% being noticeable ? you won't notice it while gaming you'll notice it if you run a benchmark program

so, you did just answer yourself....
@ purple stank, look at the video OP posted and you'll find the answer about the GTX 580 full bandwidth...
@ OP, now you already know the difference, there's no difference and if there is it's just logical :D