what graphics card is compatible with my computer?

Solution
You can run a gtx750ti on a 300w psu since your APU has a TDP of 100w. You will however, have to limit selection to only those models that do not require an additional power connection. I would highly suggest the Evga SC, as this fall in that category.

sammy sung

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PCPartPicker part list / Price breakdown by merchant

Video Card: Gigabyte GeForce GTX 750 Ti 2GB WINDFORCE Video Card ($109.99 @ Newegg)
Total: $109.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-24 19:07 EST-0500

Should work fine with your stock 300W power supply. But if you were willing to go through the hassle of replacing that with something adequate, your processor could probably stretch far enough to work with an R9-280 without experiencing a large bottleneck. Aside from very processor bound games
 

daswag3r

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Nov 15, 2013
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it says "System power supply requirement: 400W"
 

Karadjgne

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You can run a gtx750ti on a 300w psu since your APU has a TDP of 100w. You will however, have to limit selection to only those models that do not require an additional power connection. I would highly suggest the Evga SC, as this fall in that category.
 
Solution