Trying to get a new card, devolved into nothing working Help?

[Teamcreeper]

This all started when I wanted to pre-order Overwatch for PC. I knew my system now would not be good enough, so I also knew I needed a new graphics card.

I looked inside my PC today for the first time to find out the Wattage on my system. Turns out it's a 350W power supply, still works but a bit on the lower side. I though I might be able to replace, but would be a huge hassle. Next, I saw the slot PCIEXPRESS x16 2.0
The problem here is the 2.0, no (really good) cards work for 2.0 unless you guys know, meaning I'd need a new motherboard as well. Huge problem. I'm not good with graphics cards so maybe that's a fine card slot, not even sure.

Is there a good graphics card that would work for my PC? It seems like getting a new computer would be the best option, but I'm not old enough yet to get a well paying job, perhaps I get $15 a month.
The motherboard is: GA-78LMT-S2PT
Thanks!

 

[Eximo]

Any graphics card will work just fine basically. The power supply is a bit of a problem.

You will need to specify a budget, and other details about your PC would be helpful. Screen resolution and desired framerate and settings would help narrow it down.

PCIe 2.0 @ x16 = PCIe 3.0 @ 8x and so on. The connection is the same, it is all about bandwidth. There isn't a card available on the market that would have trouble at PCIe 2.0 @ 16x.

 

[Dark Lord of Tech]

PCIE 2.0 and 3.0 will perform almost the same when cards are installed , that's not an issue. You would need the case to hold the card any a proper power supply.

Budget?

 

[Teamcreeper]

Specs:
1280x1024 Resolution Maximum

AMD Radeon R7 200 Series

8 Gigs of Ram Installed

AMD 4300 Quad Core Processor 3.80 GHz

CyberPowerPC CS-417-112 Black/Blue ATX Mid Tower Raidmax Viper Mid-Tower Gaming Case
( http://www.newegg.com/Product/Product.aspx?Item=N82E16811583003 )

I would run the game a target of ~50-60 FPS on Medium Graphics

Since I cannot make much money, my budget would be around $400 - $450

 

[Eximo]

I would say you might be able to get away with a GTX750ti with your power supply, but a no-name brand power supply probably isn't the best thing to have a high load on it and is best to be avoided. Here are some choices from Newegg that have some decent rebates and promo codes.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814487024&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

http://www.newegg.com/Product/Product.aspx?Item=N82E16817438012&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=