Hello, I am looking to replace the PSU in my Dell XPS 420 (purchased 2008) as I need to replace the graphics card - my old one is dying. I have a newish 260GTX as a replacement but it says min 550W required and needs 2 PCIe power connectors. From what I have read there may an issue with replacing Dell PSU's with standard ATX PSU's. Any advice please - I am in the UK so a UK source would be great.
You shouldn't have an issue if the PC was purchased new in 2008. Dell stopped using proprietary PSU/Motherboard wiring in their systems around the time of the PIII Pentiums with 20 pin connectors. But check the motherboard connector and PSU connector you have against this pin-out of a proprietary Dell unit for assurance. http://www.informit.com/articles/article.aspx?p=339053 (scroll down to sketches)