Hi all,

So I have windows 7 64 bit installed on a MSI GD70-890FX with 2 XFX 6870s and 2 5870s

For the lack of dummy plugs, I have connected each card to a monitor.. however only one monitor will actually display anything, the rest say check signal input.

When I power up the machine, only 2 cards are seen by the OS, one 5870 and one 6870

I have a 1000W power supply.

So my questions:
1) is it possible to run 4 of these cards in windows?
2) why are they not showing up?
3) should i attach a second power supply to some of the cards? The only other psu I have will not power on unless connected to a mobo.....
4) should i install a distro of linux? I havent found a way to OC the cards past 900 MHz in linux yet....

Thanks for the help