RAM does not store files. That's a hard drive.

GPUs do not store files, or really do anything at all.

The GTX 460 alone will suffice to make raytracing run perfectly, albeit Toribash uses some ridiculous file operations that if you want to avoid ever having your FPS drop below 55 you need a solid state drive, I do believe.

Since you're already on an Nvidia GPU, changing to another Nvidia GPU will have almost no effect on anything besides your frame rates, albeit you will probably want to check if you can update your drivers afterwards.

Ok, so I get the GTX 460, and then do what? I'm sure my dad will know how to replace it all but I'm just wondering, after I buy it and get it installed or whatever, what will I need to do next? Oh, and by the way, are there any cheaper ones? 'cause I'm not spending Ѓ100+ just to get my shaders to work well.

Oh sure, there's cheaper ones. It's just that for its price, the GTX 460 is one of the best options out there. And, by GPU standards (and for what it does), it's actually ridiculously inexpensive. Of course, it's your budget, but you'll have to do your own research in that case.

You will want to make sure the GPU also fits in your computer before you actually get it. PCIe 2.0 is the standard for most stuff. Look up PCIe on Wikipedia if you need help with that.

If you're using a laptop (which you should hope you aren't), then upgrading is of course nearly impossible in any case.

Nvidia GPUs are easy enough to work with though. Plug it in correctly, start up computer, install drivers, and you're done. Again, check that your PSU can handle it.

Alright, thanks.