[citation][nom]sathishk[/nom]i want to build a PC with core i7 920, can anybody tell me the suitable mother board and graphics card,i am still thinking of this,,[/citation]
These were all good boards. I like the layout of DFI's LANParty DK X58-T3eH6 among the "under $250" boards, while EVGA offers a similar layout and pathway splitting for better performance on a third card. If you don't plan on 3-way SLI, the DFI board is a better deal.
If you really want to use just one card, the Asus P6T offers slightly better performance. Having its two x16 slots only two spaces apart doesn't make for the best SLI layout however.
So it really depends on what you want the board to do. Obviously if you're a day-trader and want eight monitors for tracking stocks and making trades, you could toss four single-slot cards in the Foxconn board. But anyone using just one or two graphics cards has many very good options.