i have cpu with asus m5a78l-m lx v2 motherboard and no graphics card with 2x2gb dynet ram and i want to upgarde gpu with sapphire amd radeon r7 260x gpu please tell me that will Enter E500A 500 W SMPS Power Supply With 2 SATA Cables be suitable or Zebronics 450 W Value Plus Comp Power Supply or Zebronics 450 Watt Economy Series Power Supply SMPS or any other please suggest. and also tell me will it be suitable to use 1x2gb ddr2 dynet ram + 1x4gb ddr3 strontium 1600mhz ram.Please suggest