P35-based boards can only do CrossFire, which is specifically for ATI graphics cards. 680i and 650i SLI use SLI, which is specifically for nVidia graphics cards. They are not compatible with each other (i.e. nVidia cards won't do SLI on a P35 board, etc). You can still stick two graphics cards in there, but they will have to power separate monitors, which is probably not what you're looking for.
What's your budget for the whole system? If it's something low (<$1000ish) you'll probably be OK with a 650i SLI board, which runs the PCI-E slots at 8x each but probably won't be an issue if you're on a budget. Then again, SLI with two grappy graphics cards isn't as cost-effective as one good card, so having a SLI card on a budget system isn't a good idea.
The 680i is probably your best bet for nVidia's dual-GPU motherboards in a higher-budgeted system Try to stay away from the LT editions.
well heres what i want to do for my build and my budget:
Start date of build: October, 2007
Budget $1400 at the most
I want this to be a Gaming PC so if you guys have any tips it'll be great since this is my first build. thnx.
CPU: Intel's C2D E6750 or Q6600 (but this wont be till after July 22nd)
Mobo: ? Undecided, here's the one Im looking at (EVGA nForce 680i SE SLI (TR Version))
Ram: not sure what brand or specs but either 2Gigs or 4Gigs
My hard drive would either be 500GB 7200rpm or not sure if i should get 160GB 10,000rpm.
I already purchased my case here's the link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811146029&Tpk=nzxt
yes full tower baby! and lots of fans. I'm a type of person that don't mind the noise...plus that case aint that loud.
Vista Premium is what would rather get.
The usually Lite scribe dvd burner er so whatever...so on...ill look into that later since i have 3months still. but i dont mind getting tip of this also.thnx.
Please let me know if there something that wont go w/what im building.
My current pc: which is 3 years old
XP SP2
AMD Anthlon 3200+ 2.2GHz
1GB kingston
160GB 7200rpm
DVD+RW/CD-RW
CD-ROM 48x
GeForce 6200 OC
yes really out of date but hey i only play CS:S (thats untill i finish my build)