Usually around 140-150 with all settings maxed. Got a new computer a month ago :p
Btw - 8800GTS G92 "KO", 4GB RAM, C2D E8400 OCed to 3.6GHz. I <3 it :)
If anything you could just find a picture of what you want and then use paint or some program like that to copy / paste writing onto it. Or you could use word to just put WordArt onto it.
Just some ideas