I was hoping you guys might be able to help me solve a tricky problem. :?
I have a Compaq Presario 6150UK PC, which uses a MS-6553 motherboard (CPU is an AMD Athlon 2100+), and runs off a Compaq PDP-121P power supply. Compaq machines have something of a reputation for being awkward to upgrade, often using proprietary wiring arrangements in order to force users to buy replacements from Compaq.
This has proved to be the case with me. I recently bought a new graphics card, a GeForce 7300GT, which I installed into my single AGP slot. However, most games and benchmark applications showed numerous graphical artifacts, which I realised was due to my inadequate power supply (220W, only supplies 5V on the 12V rail). Clearly a new PSU is needed.
However, my motherboard/PSU connection uses proprietary wiring which doesn't conform to the ATX standard. So changing to a more powerful standard PSU would also require me to buy a new motherboard/CPU, which I don't want to do for at least another year. To make matters worse, my MS-6553 motherboard doesn't appear on either Microstar's or Compaq's websites, so I can't even get the specs to check the differences in wiring.
I have a couple of ideas, but they both seem flawed:
1. I could buy one of those new dedicated PSU that directly powers the graphics card, thus bypassing any motherboard incompatibility issues. However, I get the impression that these are PCI-e only. If that's the case, I would need a PCI-e -> Molex converter, and I don't think these exist (I've only seen Molex -> PCI-e).
2. I could buy a second generic power supply and basically do the same thing - connect it to a common ground with the original, have them both switch on together, and again use the new PSU to power the graphics card. I've never done this before, but I should be able to manage it, PROVIDED I can be sure that I'm using the correct wires from my old PDP-121P unit. Since I don't have the wiring specs, this approach also might not work.
Any thoughts on how I might proceed?