i dont see why not. might be wise not to put the cards in SLi and have one card control one monitor and the other control the other monitor.
AMD x2 5000+ black edition at 3.3GHZ zalman cnps 9700-NT
Gigabyte GA-M57SLI-S4 motherboard
3072mb: OCZ ddr800 gold
2x 7800GTX in SLI for 20" viewsonic
OCZ 600watt power supply www.angelic-accessories.co.uk - plug for my gfs site