need help choosing a graphics card

XFX 550W + r7 260x for $107, or buy the r7 360, gtx750ti if you want.

PCPartPicker part list: http://pcpartpicker.com/p/jDxLK8
Price breakdown by merchant: http://pcpartpicker.com/p/jDxLK8/by_merchant/
Video Card: Asus Radeon R7 260X 2GB Video Card ($79.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($26.99 @ Newegg)
Total: $106.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-28 14:20 EDT-0400

For the RAM, try clear the CMOS by removing the battery, wait for 5-10min, put it back and boot the PC, using the "msconfig" to set the max. RAM. How to http://windowstotal.com/set-maximum-memory-to-increase-windows-performance/#.VjEPhiuG2NM