how good are nvidia boards for crossfire do i lose performance on the crossfired cards? can i get a good one for $280?
Nvidia boards can't run crossfire, only sli. 700s Nvidia boards will not bottleneck graphics cards, buy may bottleneck cpu overclocking due to fsb limits. 780i runs at 1333mhz natively, and can reliably oc to 1600mhz. This is enough for high multiplier cpus like q6600 (9x) but not low multiplier cpus like q9300(7x). 1600 = 4x400 -> 9x400 = 3.6ghz -> 7x400 = 3.0ghz.
User reviews are good, but benchmarks show its cooling capacity is lower than the other one. Individual buyers' feeling are not as objective as benchmarks. Since it also cost more, the other one is the better choice.