I recently acquired a second-hand motherboard that had a PCI express graphics card slot. I am not a gamer and only wanted to watch iPlayer in full screen on my 19 inch monitor and 42 inch TV. I tried several PCIe graphics cards but had persistent problems with their stability...with some, my PC would not even boot the bios...just a blank screen.
The PCIe cards I tried were all relatively 'low-end' and were stated to need a PSU of at least 300W. My PSU was 370W so I figured I had sufficient wattage to power them. I eventually decided that there must be a problem with my PCIe motherboard slot. A friend then suggested that a higher wattage PSU might be needed. I didn't want to spend a lot of money so I read the Amazon reviews and decided this 500W unit was worth a gamble. The delivery was very fast...ordered on Saturday...delivered at 3pm on Monday. The unit seemed very lightweight, compared to other PSU's I had used, but was straightforward to install. It is as quiet and certainly no noisier than other PSU's I have used.
After installation it was fingers-crossed...my PC booted first time and the card worked fine. That was a week ago, and my system is now stable and working perfectly. I can now watch iPlayer, full screen, with a good picture. I downloaded the ATI Linux drivers (- I run Ubuntu 10.04) and can now access all the features of the ATI Catalyst Control Centre.
I would highly recommend this 500W PSU and hope that it will continue to function satisfactorily over the long term...only time will tell on that score.
As a footnote, I would add that for anyone having persistent boot and stability problems with a PCIe graphics card the first priority is to install a PSU of at least 500W, irrespective of a lower wattage requirement being stated in the the card's specification.