I have very similar specs to yours.. except im OCd to 4.7ghz and have a gtx 680 video card 2gb. I have a fresh install of windows 8 and fsx. The only addons i have at the moment are ultimate traffic 2, rex with hd textures, and fsx global, fs dreamteam cyvr. And the 777 with 300 expension. I followed kostas guide and im only getting 15fps in VC. 25fps in spot on ground. Looks like OP and me are in same boat. Glad I got this on 9.99 sale....