The chaps over at Guru3D have re-posted some leaked GeForce GTX 465 numbers that were originally posted by the Chinese website eNet.com:

According to the driver control panel screenshots, though, Nvidia has disabled quite a few bits and pieces: there are only 352 stream processors, 1GB of RAM, and a 256-bit memory interface. Clock speeds look to be 607MHz for the GPU, 1,215MHz for the shaders, and an effective 3,206MHz for the GDDR5 memory.

eNet says its benchmarks show the GTX 465 is slightly quicker than the Radeon HD 5870 in Far Cry 2, "significantly slower" than the Radeon HD 5830 in Crysis Warhead, and in between the Radeon HD 5850 and 5870 in Unigine's Heaven benchmark. That doesn't sound like a bad effort if the card ends up launching at around $300 as those European listings suggested.