Is the GTX 660 Ti ok with Intel Core 2 Quad CPU @ 2.4 GHz

Hi, my first post here...

APPROXIMATE PURCHASE DATE: the sooner the better

BUDGET RANGE: $350 - $450 (GPU, RAM, PSU)

USAGE FROM MOST TO LEAST IMPORTANT: Gaming [Far Cry 3, Assassin’s Creed III, Call of Duty: Black Ops II, current demanding games at full settings], watching movies, etc.

CURRENT GPU AND POWER SUPPLY: 256MB NVIDIA GeForce 8600GT, 375W PSU that will be changed to accommodate new GPU. At least 450W.

OTHER RELEVANT SYSTEM SPECS: Dell Dimension 9200(DXP061) w/ Intel Core 2 Quad CPU Q6600 @ 2.4 GHz, 3GB DDR2 SDRAM @ 667MHz - 2x512MB, 2x1GB(prob bump to 4GB @ 800 MHz - 4x1GB), PCI x1, x8 (x4 electrically) and x16 1.0a slots, Vista Home Pemium SP2 32-bit,

PREFERRED WEBSITE(S) FOR PARTS: ?? COUNTRY OF ORIGIN: Canada

PARTS PREFERENCES: looking for something in a GTX

OVERCLOCKING: No / Maybe SLI OR CROSSFIRE: No

MONITOR RESOLUTION: 1440x900 native but replacing – not sure when, may be 6+ months..

ADDITIONAL COMMENTS: I'm looking at the GeForce GTX 660 Ti but I’m concerned about buying something bigger than my system will run.
How does the CPU factor into the equation?
Will my CPU be okay, is the GTX 660 Ti ok with Intel Core 2 Quad CPU @ 2.4 GHz? If not, any recommendations?
Will PCI-e 1.1a be an issue?

Thanks so much for the help.