Having two graphics cards in a e520

Hellow, I have a x16 gts8800 currently in my tower and am trying to bring up a second x1 pny ns 300. bot are nvidia. The seconrd, nvs 300, does not show in the device manager. Any reason why?
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Paul SauvéRetiredCommented:
If you have 2 graphic cards, are both connected to different monitors? When you say it doesn't show up, do you mean in the peripherals list?

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dcawoodAuthor Commented:
I have one monitor and one projector connected to the 8800 and a monitor connected to the the NVS 300. I plan to have another monitor connected to the NVS it is being shipped.

The power supply is 750 watts. The Dell E520 bios is up to date. I had to update it before putting a quad 6600 chip in.

In the bios the card slot shows as not populated. It is being turned off somehow because the x16 is in use for video??
are you sure the power supply can handle both?  
calculate what you need here  : http://www.extreme.outervision.com/psucalculatorlite.jsp
dcawoodAuthor Commented:
I put a 750w antec earthwatts in a few months back. When I got back in from golf last night I realized the card was not seated correctly. It work great after using the latest drivers. Can't wait to get the third monitor. It is much easier to use the projector through the hdmi receiver with it having it's own source!
tx for feedback
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