Street Fighter 4/ Graphics card help

[jamin]

Hi everyone, iv been lurking for a while and have learned alot from the forum
I have just completed my mame cab, i converted an arcade cab using a jpac and AVGA2 card, keeping the original arcade monitor. After searching around youtube, i noticed Delusional has SF4 running in his cab, so im trying to go about getting it into my cab aswell 
Basically before i start wasting any of my time, i have a quick question that maybe someone could answer for me.
My PC spec is more than enough to run SF4, but the AVGA2 card is not. So i was wondering if it possible to install a second graphics card and soft 15hz, then configure sf4 to run through the second card?
I want to leave the AVGA2 in place because its working perfectly and dont see the point of messing around with that side of things
Any kind of help would be greatly appriciated
Thanks