Voltage Creep on cpu?

I have a strange issue that I'm trying to isolate. My dumbass kill my AWESOME power supply. It was a Silverstone 750 watt. What happen is that I had the computer running, and the cover off the PSU. The cover was off so that I get some some dust bunnies hiding in there. I know that a quick blow job *giggles* would of been sufficient, but I'm have OCD when it comes to cleaning. But one of my cats though it would look like fun to play with it, so I had to put the cover back on. I touched one of the heat-sinks with the cover while it was still running. *sigh* It does not power on anymore.

So, i baught a used CM 650W from a freind. It works, but i noticed that the voltage going to the CPU is no longer rock soild. It creep upward as the CPU become stressed. It's almost linear to the amount of stress that I put on it too. At 1.35, it will hover around (1.4 - 1.41v). Now, if I overclock, and push the voltage to 1.525, it will jump past 1.6V. The highest I have ever recorded was 1.63v.

So is this a POS PSU issue, or did I happen to fry something small when I shorted the previous PSU?

This isn't a PSU issue but a VRM issue.. chances are you fucked the motherboard VRM when you fried the PSU and it has problems regulating the CPU voltage/s.. take off the VRM heat sinks and see if something's fried..

how about some real measurements all round with a multimeter/scope. idle vs load 12v, 5v and 3.3v rails would be a start. you can measure cpu vreg too, looking at it from the chokes usually gives you what you are looking for

Profumo said:

This isn't a PSU issue but a VRM issue.. chances are you fucked the motherboard VRM when you fried the PSU and it has problems regulating the CPU voltage/s.. take off the VRM heat sinks and see if something's fried..

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grounding out the tab on a mosfet will probably simply just bake the smps, not give transients through the outputs. anything is possible tho. For all we know his old power supply sagged under load and this one isnt so he's seeing LLC style boost

i find it most likely tho that his 3.3v or 5v rail is funny, and the ref's on the mobo sensor chip are wrong, and thus giving incorrect readings

He has a Silverstone Strider Gold listed in the system specs.. high end unit, and the load wasn't something this PSU would have a problem with.. but yeah, could be nothing more than bad sensors.

That is a advertisement that you clicked on. I did not provide any links. It was a OP750, but it was still a very high end unit when I bought it in 2007.

I don't think it's bad sensors. Because when I watch the voltage, it does fluctuate and the temps correspond to the voltage as well. I think something happened to the motherboard though. The CM PSU is a RS 700 PCAA E3. It's no silverstone but does the job just fine.

Where can I test this on the motherboard?

FireBean said:

That is a advertisement that you clicked on. I did not provide any links. It was a OP750, but it was still a very high end unit when I bought it in 2007.

I don't think it's bad sensors. Because when I watch the voltage, it does fluctuate and the temps correspond to the voltage as well. I think something happened to the motherboard though. The CM PSU is a RS 700 PCAA E3. It's no silverstone but does the job just fine.

Where can I test this on the motherboard?

Click to expand...

If something got fried on the motherboard it should be visible.. you just need to take off the heat sinks around the CPU socket and visually inspect the inductors and mosfets below them, the chokes and caps are visible without removing the heatsinks but I doubt either of the latter failed..

You should also check the voltages with a multimeter and see exactly what you get, much more precise results than any mobo sensor readings..