Nvidia GT 520 or 430 and 10.6.8

Hello, I'm thinking about getting a low power discrete GPU for my build. Currently the machine runs well with 10.6.8, but intel HD3000 is giving some artifacts and its behavior is not always convenient to use. The power supply I have only has a single 6 pin pcie connector, and I don't need a powerful card anyways. I have to stay with 10.6.8 for some software compatibility reasons.
So the question is, is the GT520 or 430 compatible with 10.6? Are either card fast enough for common desktop acceleration, such as expose? If not, what cards would you guys recommend?

Thanks.

Hammer

P.S. This site and you guys are awesome. This is my first build, and it went as smoothly as I could have hoped for.

nVidia's GTX 5xx series card are only supported from Lion.

GT430 should be enough.

@Mate94: so the 400 series are compatible with 10.6?

I guess the GT520 in Customac Sandy bridge recommendations is for Lion only then.

Thanks a lot, 430 it is....