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Its safer to install each pack on top of each other now spirirts as that's what they are designed to do.
The only safe way of installing a driver properly and cleanly is to start with a fresh OS, then install the latest drivers for everything.
Installing them over the top has been proven to cause problems, but installing the latest driver fresh can't possibly cause problems because you're installing a the latest driver on a fresh OS. :S
Ive measured it, the powercolor is 1.12v, 1.2v for the others with no easy voltage mod. cool and quiet though.
Found another article that is a pretty good read:
http://www.insidehw.com/Reviews/Gra...raphics-Card-Round-up-Spring-2010/Page-5.html
Looks like the 5830 is roughly half way between a 5770 and 5850, but slightly closer to the 5770. In price though, this is not the case.