Thinking of putting a Nvidia GTX660TI IN MY a10 system, Specs are. A10-7870, 16 gb Gskill dd3, ASUS AX88M-e Mobo 2 fans 92 and 120 mm, 5 SSDs 2 intel, 1 samsung 840, 2 Pny ,and a Blue Ray combo drive , Currently have an Antec Vp450 PSU . PsU extremme calc say 355 watts with the nvidia card. Do I have enough leeway here?