No more cycles or anything since they were designed to be low-profile. The GT210 might be better if you are scared about the power draw caused by the 6670

You might also just get a 300w psu, they aren't that expensive. $30 maybe?

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My Hardware
CPU: Intel Celeron G530
Memory: 4.00 GB DDR3 1333Mhz
Graphics: NVIDIA GeForce GTX 550 Ti
OS: Mac OS X Lion 10.7.4 - Vanilla kernel
Motherboard: Gigabyte GA-H61M-D2-B3