Faulty PSU?

tatts · 24 Jan 2008 at 12:13

Having a lot of issues with my current rig

Anything over 3.6ghz is prooving near possible even though it will do 3.2GHZ on the stock V of 1.23V & 3.6 @ 1.35V but im getting an horrible squeeling noise from near the cpu.
After finally getting OCCT to work i run a test to see how my PSU is and it doesnt look stable to me or is it just me being paranoid?

Psu is a OCZ GameXstream 850W

lord filbuster · 24 Jan 2008 at 12:29

it looks fine to me, i believe the tolerances for voltages is +/-10%, and those are well within the limits, for instance, the 3.3v is only fluctuating by a max of 0.04v, which is about 1%, it is just because the scale on the graph is small that it looks unstable. Besides, i think at 3.6GHz the chip has probably reached it's limit. Even 3.2GHz is pretty damn impressive. Im not sure what the squeeling noise is could be the mosfets or voltage regulators or something, but i'd take it as a sign to back off the voltage.

tatts · 24 Jan 2008 at 12:40

lord filbuster said:
Im not sure what the squeeling noise is could be the mosfets or voltage regulators or something, but i'd take it as a sign to back off the voltage.

Cheers. I cant back off the volts though, it does it when running stock speeds with stock 1.23V :confused:

Trying to find the cause of it so i can get it rma'd and sorted, least i know its the cpu or motherboard now

lord filbuster · 24 Jan 2008 at 12:53

could be the cpu fan then? maybe try unplugging it (just for a few seconds) to see if the noise goes away.

tatts · 24 Jan 2008 at 13:00

Read the sig, im on high end water cooling so theres no fan to make the noise

also been onto gigabyte and they dont know what the cause could be, happened on my last w/c loop, stock heatsink & now my new loop so i can only see it being the cpu or mobo now :mad:

kylew · 24 Jan 2008 at 13:30

I've just recently had my PSU blow on me and I have a suspicion that it was to do with my Q6600 being overclocked too high, I had it at 4.05Ghz

D)with a vcore of 1.67 volts going through it. I think it was to do with it not being able to supply enough power to all my stuff, as i could fully run 3d mark 06 at 3.9Ghz, but at 4.05Ghz, i couldn't complete the whole test, I could run the CPU bench, and the graphics benches separately, but all in a row and it would crap out.

tatts · 25 Jan 2008 at 18:36

Well after getting in touch with OCZ, i connected up a multimeter to the 3V 5V & 12V which all give the right readings (unlike any window apps) and after opening p95 for a few minutes to test each one none of them moved so i think the psu is pritty stable.
Just goes to show how much the onboard sensors suck :mad:

IAmATeaf · 25 Jan 2008 at 21:10

PSU tolerances normally allowed are +/-4% (I think) only the 12v rail is nearing the limits TBH, the spikes are a result of PFC and rails being effectively tied together so demand on 1 rails induces a dip in another until the PFC kicks in.