Radeon 2600 HD showing up as a 3600, having trouble playing old games

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About 4 years ago I built a computer with the following specs:
Q6600
4GB of DDR2 RAM
nVidia 8800GTS 512
500GB HD
Windows Vista

A couple months ago my 8800GTS konked out on me and I was forced to purchase a ATI Radeon 2600 HD, I installed it, wiped my HD while reinstalling Vista, installed the correct drivers, and reinstalled some of my games. I was pretty disappointed with the performance with games such as CSS, I figured it should have no problem playing a game older than the card.

Now heres where things got weird. I noticed that my computer was recognizing my card as a 3600, not a 2600. For a little bit I thought that somehow I had been sent the wrong card, then I realized that the 3600 runs off of PCI x16 2.0 and I only have x16 1.0 slots. Anyone have any ideas why its showing up as a 3600?

Also, since I installed the card, my computer tends to have the BSOD ever few hours, this has been going on for a couple months. It doesn't seem to matter whether I'm doing something taxing like playing a game or working on a document in Microsoft Word, still BSOD. Weird thing though, the BSOD stopped happening the past week.

Finally, I purchased some older games after I realized that CSS is still going to lag on Medium/Low. Return to Castle Wolfenstein will have some weird graphical lag every once in a while, which seems absurd for a game that came out back in 2001 playing on a card that came out in 2006 or so. Also, my brother started playing GTA San Andreas which will run at close to 3 FPS if I have anything set above the bear minimum.

Anyways I'm just trying to figure out if there is any solution to my problems here...