Incase you're wondering about my gaming rig, I'm using an AMD Phenom II x4 955 based build
(All DDR3 AM3 etc, so was quite balanced for the time i built it),
which has given me no end of bliss for 5 years, and my previous card which was a GTX 260 was beginning to show its age in some games, and after having my sights set on a GTX 560 previously, i'd waited and waited, and when i saw the 660 was quite an affordable price, i bought this GPU.
After using this for a month i can safely say i'm pleased with my purchase, not only 2Gb of ram from 896Mb but also a DirectX 11 compliant card, and as far as gaming goes, everything i've played using this card has benefited:
Deus Ex: Human Revolution,
and Alice: Madness Returns,
are all much more enjoyable and playable running at a resolution of 1920x1080 with most settings at maximum.
Personally, i leave Anti Aliasing disabled, and would have Anisotropic Filtering set at 2x or 4x, as i much prefer the responsiveness over having nothing but eye candy.
Some might wonder why didn't i go for a Radeon GPU like the 7850/7870, i much prefer nVidia GPUs, i have used Radeon GPUs before, and i even have an AMD APU based laptop with a Radeon HD 6320 GPU, which for the platform is quite capable, but this is neither here nor there.
Overall i'm very pleased with my new GPU, and the new lease of life it's given my PC