Originally Posted by wildfire99
could you be specific about what performance is better im under the same cercumstances as OP'er and would like to know exact performance difference.
There are only two differences as far as performance. First is the number of PCIE lanes. The 750i only supports 1 x16, 1 x8, and 2 x1 simultaeous connctions. The 780i can handle 3 x16 + multiple others (total of 62 lanes) at once. This gives more performance for SLI, plus gives him the option of SLI + raid controller in the future. However, unless the OP is running an extremely high resolution, the performance difference isn't going to make or break his gameplay.
The second difference is the memory controller. The 780i can, on average, overclock memory to a higher stable bandwidth than the 750i. However, this difference will only come into play when reaching for the absolute highest speeds (1200MHz+), so unless the OP plans on buying some expensive DDR2 it won't matter. And if he wants to spend that kind of money on ram, he might as well just go for a 790i+DDR3.
Well I guess there is a third, which is that the dual gigabit cards on the 780i support load balancing which means that he can team them up for a 2Gb/s connection. But that is really useless in 99% of homes.
And the 780i will be able to OC a Q6700 to 3GHz, that is certain. The only catch is you might end up hitting an FSB hole on the way, which makes it more difficult. The solution is to run at an extra high FSB, past the hole, and just drop the multiplier to get the speed that is stable.Edited by Manyak - 5/15/08 at 5:43pm