650$ gaming tower

I was wondering if the RAM I have in my build is decent, the RIPJAWS series is back order. Should I wait for them to be back in stock or are the one I linked good enough for gaming?

Approximate Purchase Date: Later this week

Budget Range: 650$ CAD

System Usage from Most to Least Important: Mostly for gaming, WoW, FPS

Parts Not Required: Keyboard, Mouse, Monitor, Speaker, OS, DVD DRIVE, HARD DRIVE

Preferred Website(s) for Parts: www.bestdirect.ca

Country of Origin: Québec, Canada

Overclocking: Probably not, I would most likely end up burning my house ^^

SLI or Crossfire: In the future

CPU : AMD Phenom II X4 955 Black Edition Quad Core Processor 3.2GHZ AM3 8MB Cache 125W Retail Box
http://www.bestdirect.ca/products/223993/HDZ955FBGMBOX/...

RAM : G.SKILL F3-12800CL9D-4GBNQ PC3-12800 4GB 2X2GB DDR3-1600 CL9-9-9-24 240PIN Dual Channel Memory Kit
http://www.bestdirect.ca/products/177500/F3-12800CL9D-4...

MOBO : ASUS M4A79XTD Evo ATX AM3 790X DDR3 2XPCI-E16 2XPCI-E 2XPCI CrossFireX SATA Audio GBLAN Motherboard
http://www.bestdirect.ca/products/221126/M4A79XTD%20EVO...

GPU : Gigabyte Radeon HD 6850 775MHZ 1GB 4.0GHZ GDDR5 2XDVI Mini DisplayPort HDMI PCI-E Video Card
http://www.bestdirect.ca/products/231361/GV-R685D5-1GD/...

PSU : XFX 650W XXX Edition Single Rail Modular ATX Power Supply ATX12V 52A 24PIN 80PLUS Bronze
http://www.bestdirect.ca/products/230778/P1650XCAH9/XFX...

Case : Coolermaster Haf 912 Black Mid Tower ATX Case 4X5.25 1X3.5 6X3.5INT No PS Front USB Sound
http://www.bestdirect.ca/products/230752/RC-912-KKN1/CO...

Optional fan : Coolermaster Megaflow 200MM Red LED Case Fan 700RPM for HAF932 922 Cosmos S Atcs 840 Storm Sniper
http://www.bestdirect.ca/products/228326/R4-LUS-07AR-GP...