I just bought an XFX 750i SLI Motherboard, but i just found out that when running on SLI mode one card will run at 16x and the other one at 8x (16x+8x), i also purchased 2 BFG 250 GTS OC 1 GB (each) so i can put them in SLI mode...
I was thinking in returning the motherboard and get a 16x+16x but not sure if it would make a big difference..?
Thank you for your responses, i was kind of hoping to hear that so i don't have to return and get another one etc...
16x+8x doesn't mean the second card will be running at half speed right?
Why does it matter more on the more expensive cards?
Actually, both your cards will be running at 8x8x
But you don't need to worry about it. The 16x pci-e slot was built with future compatability in mind and there is no chance you can hurt performance with a gts250. Even todays top cards run ok at 8x8x so even when the pci-e slots hold the cards back, it's not nearly so bad as half speed - talking 5-10% maximum.
Next gen cards could be a whole different matter though.
I have a challenging question for myself but hopefully not for you guys!
Motherboard: Asus P5Q-E
Processor: Intel Core 2 Quad Q8400 @ 2.66 ghz
Graphics card: ATI HD 4890
I would like to update the computers performance with a small budget, and i would like to buy another HD 4890 for crossfire, but the motherboard supports only pci-e 8x in crossfire, so should i update something else or just go for the crossfire?
I found this:
HD 4890 = 975mhz (quad piped - 3.9 GB/s data rate) = 3.9 GB/s total data rate
HD 4870 X2 = 900mhz (quad piped - 3.6 GB/s data rate)(times 2) = 7.2 GB/s total data rate
So as you can see, the 4870 X2 will be hurt in an 8X condition and why the 3870, 4650, 4670, 4770, 4830, 4850, 4870, 4890, and 4850 X2 will not be hurt in performance at all.