I would think a 6200 is not as good as a 5600.
Yeah the 6200 is a lot slower then the 5600, regardless of video ram amount. Considering neither cards gpu is very efficient even at older games past 1280x1024 anyway, the amount of video ram doesn't matter much. Older cards from the FX timeline that are solid are the FX 5700 and 5900. They were decent performers over all and could run on a 300 watt psu fine. Same with the Radeon 9700-9800 cards. Basically the same deal with them too. Any of those 4 cards would crush the Geforce 6200. I have a FX 5900 and a Radeon 9700 Pro for sale. Sent the OP a PM about them.