nVidia GeForce GTX 280 1GB Video Card Review

[RobRich]

One of the most important features of GT200 is its support for more than 30000 threads. Its control logic makes sure that all streaming processors are loaded by 100%, not idling away. Each SM can execute up to 1024 threads simultaneously. So thirty such units in GT200 can cope with 30720 threads simultaneously. Compare this number with 768 threads per SM and 12288 threads per GPU in previous solutions based on G80 and G92.

Source: Digit-Life