Heck, I use a generic integrated 810e video card on my P3 600 mhz and SFC3 runs fine.  Granted, I can't run most games now, but who cares.  Most games these days are etheir role playing games or crap.  If I want too play games like that, I will play them on my PS1/2.  You don't need intense, pretty graphics for a good strategy game.  It helps make games like SFC more enjoyable, but its the gameplay that counts.