Re: onboard video card
providing there is an expansion slot available then yes you can add a graphics and sound card.
Onboard video is very limited if you're a gamer, probably fine for most day to day tasks if you don't game.
Onboard sound is sufficient for most things.
What board are you looking at?
E8600@ 4.25GHz, 1.325V | Thermalright Ultra 120 eXtreme + Scythe Slipstream 120 | Asus Rampage Extreme| 4GB Corsair 2000MHz 8-8-8-24 @ 1600 6-7-6-24| ASUS 9800GTX| Pioneer 18X SATA DVD-RW | 320GB + 500GB WD SATAII | Antec True Power Trio 650W | Thermaltake Sonata | Vista Ultimate x64 SP2/Win7 Ultimate