Yes, you will be fine. I have been doing a lot of performance research with SF2 given my system is rather old at this point.
P4 2.6 GHZ
2 Gig ram
XP
Geforce 6200 512M
First off, I had some serious performance issues with the latest, greatest video drivers. I get much better performance using older 81 level drivers.
The fact is that given the same settings with SF1 and SF2 sims I actually get better results with SF2. You need to keep in mind that there are a couple of settings in the OPTIONS.INI that can only be modified there; they are not available in the OPTIONS game screen. CloudDetail will kill a machine like mine if it's not set right. (I use 0). AntiAliasing is also set in the OPTIONS.INI.