What's the best graphics card for my system?

Waylander12

Commendable
Dec 30, 2016
1
0
1,510
CPU: Intel Core i7-6700K -
GPU: AMD Radeon R7 250 -
SSD: Adata Premier SP550 120GB -
HDD: Toshiba DT01ACA100 1TB -
RAM: Unknown DDR4 2400 2OZ 2x4GB -
MBD: Gigabyte GA-B150-HD3P-CF

I ordered this from ibuypower. Thinking I was saving money by getting a lower end graphics card. I am now ready to upgrade. I can't find any compatibility specifics in the manual but I was hoping to go to a nvidia 970 at least.. about 500 to spend!