GeForce GTX 650 1GB Review
GeForce GTX 650 1GB is a fast-middle-class GFX based on the 28nm Kepler architecture. It's based on the Kepler GK107 Core (same used on GT 640) with a count of 384 CUDA Cores (just like GT 640) but paired with fast GDDR5.
Therefore, GeForce GTX 650 1GB can be addressed as a fast GeForce GT 640 paired with fast GDDR5.
Gaming benchmarks indicate its performance is about 1% better than previous generation - GeForce GTX 550 Ti which might not make it a worthy replacement due to its extra cost and that the most demanding games (Metro 2033, The Witcher II, etc) still require reduced settings while modern demanding games (Battlefield 3, Max Payne 3) are playable at high settings but not paired with extreme resolutions.