ISA

So, in my school, me and my teacher are working on a really old model PC. It would be all open and could be taken apart for teaching purposes. We have this Trident graphics card in there but it isn't outputting any video. So my question is: Can this GPU be still functioning and the only problem...

I'm kind of a noob to PC gaming but I was going to get this video card the R9 270x OC Edition and I noticed there was two models. There's a 2GB and a 4GB option. Now why is the 4GB cheaper then the 2GB version of the same card? Am I being an idiot here? Because I actually wanted the 2GB but if...