GeForce 8800 GT vs GeForce GT 630

Though 8800Gt is a dx10 card, it is slightly better than gt630. But you will be able to play that game on 630.

try gts250

The 8800 GT is a significantly more powerful card than the GT 630, despite being five years older.

http://www.game-debate.com/gpu/index.php?gid=588&gid2=332&compare=geforce-gt-630-vs-geforce-8800-gt-256mb
I believe that, in general specs, the 8800 is considered lower than 630, so you should be fine.

GT 630 is a little slower but it supports DX11

Small collection of benchmarks here

http://www.anandtech.com/bench/product/521?vs=610

Here's a place to help you compare the performance:
http://www.futuremark.com/hardware/gpu
So the 630 scores 1160 while a 8800gt should be around 1500. The 8800 will have much higher temp (mine lasted 16 months and died) while the low-end shouldn't have this problem. Being you I would choose a more recent card but that's just me.

GT 640 is better , new and powerful Hd + DX 11 /128 bit and 2bg

using GT 630, i can see it easily supports and runs mostly all games from previous year at low-med settings.