These BSOD's should also give a STOP code, something like:
STOP: 0x000001A, followed by three more hexadecimal number strings.
That first hex string can be entered into Microsoft's website's search engine; entered like "STOP 0x1A" or whatever it might be for your system.
As for Q-Tec being famous, I can't say I've heard of them. I've heard of:
- Deer. Adeqate generic PSU's for low-power systems that aren't too critical)
- Antec. Good. Not PC Power and Cooling good, but good.
- Enermax. Never used one, but they're said to be good.
- Fortron.
- L&C. Generic stuff. In my experience, they don't sustain high-power output levels well, as evidenced by one that had a resistor blow up when I ran a CPU stress test. The resistor literally blasted itself apart, and the circuit board below it was blackened.
- Enlight.
- Duro. These are crap. The circuit board is sparsely populated, the heatsinks are small, and it just feels cheap.
Low-res comparison of Duro 400W vs Antec 350W
High res picture.
So give memtest a shot; go through its first 3 menus too and enable all tests, enable testing of All memory, and enable cache. Any errors in memtest are a bad thing. Check if they occur at the same addresses. If the same addresses are failing every pass, it's probably bad memory. If the addresses are seemingly random, it's probably not the RAM itself. Maybe the timings are wrong, the voltage too low, or else the power is just too dirty. I've never seen the inside of a Q-Tec PSU, so I can't say how good they might actually be.
I just did some Google searching to find info on Q-tec supplies.
This thread does not build confidence in them. But then I did find some reviews of their Gold-series PSU's that showed them to be fairly decent. Not Antec or Enermax grade, but adequate. Their circuit boards appear to be fairly well-packed too. What model is this Q-Tec PSU you have?