RAM issues soln.

Solution
320w PSU is enough, for a 750ti. The 750ti is actually targeted at people with OEM systems, with a 300w or higher PSU. I do not believe the bios will affect you any.
n wht abt
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127836&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10487648&PID=1800524&SID=

i wanna use a low profile card in my full height pci x16 slot will d gpu work???