PC component (video card) upgrade question

I think as long as the motherboard has the right slot, you're fine. AGP vs PCI-E. Just know which is which and the length of the new card. The size is usually listed. So make sure there is room for it.

Thanks to you both... it's that sort of limitation (2.0 vs 3.0) that I was worried might exist... so thanks for the clarification on it!

And you're correct, my motherboard is 2.0 for PCI slots (it's an ASUS P67, www.asrock.com/mb/Intel/P67%20Extreme4/?cat=Specifications). So as much as I was hoping to get by for another year or two by just upgrading the card, I guess it's time to do the whole upgrade thing....

Seems overpriced, you could do better buying and building it yourself. Did some research in the Newegg's website, and this is what I  was able to come with:

Core i5 6600 = US$ 220. A waaaay better CPU. You could change it for a 6500 if you want to save more, still would be better than the 6402P.
Gigabyte GA-H170M-D3H Motherboard = US$90. Probably a better motherboard. Probably because there is no specifications about the one that comes with that pre-built PC, other than the B150 chipset, which doesn't tell us much.
Sapphire Nitro+ RX 480 = US$250. Custom version of the same RX480, but with more memory. Protip: NEVER buy a VGA that comes with reference cooler, like the one in the pre-built. They ALWAYS are inferior about everything, including performance.
Corsair 16GB DDR4 RAM kit = US$93. I think this is a little overpriced, maybe you could find one less expensive, but whatever.  While for now 8gb is enough, you never know right?
WD Black 1TB hard drive = US$69. The black Western Digital drives comes with 5 years warranty, and are highly regarded.
Corsair CX500W 80+ Bronze = US$47. Good budget PSU, enough for the specs and with the 80+ bronze seal. You have to be cautious here, there is no specifications about the PSU in the pre-built PC you linked. A bad PSU could ruin everything in there.
Cooler master HAF 912 = US$60. This is overpriced. The case is more of a personal preference than anything, so just choose something you like (given that you don't pick a mini-stove lol).

Total: US$ 810. Indeed, more than the pre-built PC but way better, and you could change something, like the case or buying 8GB of RAM instead.

If you don't care about buying everything at the same place, see PC Part Picker for better prices.

Yeah well, about the CPU, I said that to myself when I bought one AMD FX6300 in 2013 for my then new PC. The result, as expected, disappointment. CPU intensive games like GTA V (and open-world games in general), MMOs and some bad ports (I'm looking at you, Final Fantasy 13) do benefit from a better processor.

Anyway, the only thing inherently bad about the pre-built (aside from the PSU), is that RX 480 with reference cooler. You really should stay away from that. Really, sell it or something and buy a non-reference model from Sapphire or MSI. Other than that, it is sufficient for your needs.

And by the way, Elfina Ashfield said something about the PCI Express 2.0 bottlenecking the graphics card. That's not an issue though, as TPU just tested in this review.

If you're getting a GTX 1080 might as well get a better CPU man.

Ooh, interesting. Hrm. Decision, decisions.

I may just go w/ a graphics card in the short term, then. My RAM is currently at 32GB, and I have plenty of SSD HDs. So it's really just CPU (i7 2600k @ 3.4 GHz) and video card that are lacking...

When the nVidia rolls out their new line of cards this upcoming year, I'm getting a GTX 1070. Hopefully it won't be hard to find when this happens. All I'm expecting is a drop in price.(My budget for a new card is at most $350)
My current card is a R9 280X...hahahahaha. 2013 was such a fun year.

NICE!  That's the one I want, but my budget is at most$350.  

Should of specified the Founders Edition in my post.  Where did you find yours on sale?