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Am I hitting a PSU output cap when overclocking my FX-8120?

post #1 of 15
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So, recently I got a new cooler in my rig (sig rig) so I could attempt to push my clock higher on my new FX-8120. Immediately after getting it I popped in my old ACF7Pro and clocked it up to 3.6 no problem by just increasing the multiplier, I didn't attempt anything higher in fear of overheating as I was idling at around 40C with the freezer 7 pro according to Core Temp. So, today I just got myself a nice new Corsair Hydro block. BTW, this thing is tits! Coming from a cold boot at the existing 3.6 clock the average idle was 10C!!! I honestly have never seen a cpu temp so low!

So, with the temperature now being incredibly low, I decided it's time to push the clock higher. So, in my first attempt I aimed for 4.4GHz by simply increasing the multipler, also, I disabled cool n' quiet at this time too. I read from a post earlier on this forum that you can very easily reach up to about 4.5 by just increasing the multiplier on the 8120. So, when I powered it on, the post passed fine but when I got into windows I was greeted by a complete freeze when re-running the WEI assessment. Now by freeze, I mean complete freeze, I could not even move the mouse, and the screen just kept its state, not even a BSOD. Now, I was monitoring the temperature in core temp the entire time, and by the time it froze core temp was reporting about 28C, nothing even remotely high at all. So I then attempted to lower the clock to 4.2. Same thing happened, complete freeze, and I had to hard-reset. So at this point I thought of turning off the CPU boost and the Turbo boost option in the bios. Still running at 4.2, the same error happened.

So, I am really not the most experienced in Overclocking, and I havent done it in years (my 1055t was locked down, so I haven't even bothered in the past 2 years). Also, I'm not completely sure about what to do with core performance boost settings, turbo, or cool n' quiet.

So, at this point I'm either convinced that my 850W PSU can't handle the overclock when used in tandem with my GPU, which also draws a decent amount of power, but not nearly as much as BD does when it is overclocked. Or perhaps, that I need to tweak my FSB, but I'm not sure by how much, or how to safely do so without changing my RAM frequency if at all possible.

So, I apologize for the complete noob questions, but I'm a little puzzled.

EDIT: Also, my PSU is about 2 years old, and it's not really "top tier" in terms of quality, but I would imagine it would be able to handle this.
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post #2 of 15
Forgive me if I am wrong, but I don't see anyting vcore related in your post. Did you try increasing the voltage supplied to the cpu when raising the multiplier? I doubt the chip can hit 4.5 stable on stock volts...
    
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post #3 of 15
Thread Starter 
Quote:
Originally Posted by poring View Post
Forgive me if I am wrong, but I don't see anyting vcore related in your post. Did you try increasing the voltage supplied to the cpu when raising the multiplier? I doubt the chip can hit 4.5 stable on stock volts...
Thanks, that's what I've been tweaking right now, however I did manage to get to 4GHz stable on stock voltage, which is interesting.
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post #4 of 15
Thats great hope u get the overclock you want. It seems that 4.5ghz only requires roughly 0.1v more, with a little variance here and there.
    
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post #5 of 15
Quote:
Originally Posted by Ballistic Buddha View Post
Thanks, that's what I've been tweaking right now, however I did manage to get to 4GHz stable on stock voltage, which is interesting.
Would you mind posting a screenshot of your bios @4ghz? Im curious to see your voltages. Ive been walking my 8120 up from stock. Im not in a hurry; currently at 3.6ghz @ 1.2125v

Im at about 40 degrees C under load with Thermaltake Frio.
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post #6 of 15
Keep in mind the FX chips are pretty much crap and pulling 500w overclocked.

The power consumption is stupid high when overclocked in some situations and that's probably where your problem lies.

Edited.
Edited by Dustin1 - 10/22/11 at 8:57am
 
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post #7 of 15
Quote:
Originally Posted by Dustin1 View Post
Keep in mind the FX chips are pretty much crap and pulling 500w overclocked.

The power consumption is stupid high and that's probably where your problem lies.
There is no way he is even close to 500watts system load @ 4.2ghz unless he is pushing like 1.6 volts or something unreasonable.
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post #8 of 15
Quote:
Originally Posted by Dustin1 View Post
Keep in mind the FX chips are pretty much crap and pulling 500w overclocked.

The power consumption is stupid high and that's probably where your problem lies.
500w for the cpu??

really ?

thats like

322 amps at 1.55 volts.

Battle ship hull welding, really ?
post #9 of 15
Quote:
Originally Posted by SCollins View Post
500w for the cpu??

really ?

thats like

322 amps at 1.55 volts.

Battle ship hull welding, really ?
When you get around 4.8GHz, yes. 500W for total system draw with only CPU stresses (no memory tests, no GPU test). Just the CPU and a CPU only benchmark. But not anywhere near this much power at lower speeds, so the OP is safe-ish for now.

http://www.bit-tech.net/hardware/cpu...8150-review/10

Look at the second test. 4.8GHz = 586W. AT THE WALL. So for the actually CPU consumption, shave like 15% off or whatever for PSU inefficiencies.
Quote:
For this test, we want to only stress the CPU, so use the smallfft stress test of Prime95 to fully load all available processors (logical as well as physical). We leave Aero enabled, and wait a few minutes for any power saving technology to kick in and for the power consumption to level out before taking our reading.
    
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post #10 of 15
Quote:
Originally Posted by DayoftheGreek View Post
When you get around 4.8GHz, yes. 500W for total system draw with only CPU stresses (no memory tests, no GPU test). Just the CPU and a CPU only benchmark. But not anywhere near this much power at lower speeds, so the OP is safe-ish for now.

http://www.bit-tech.net/hardware/cpu...8150-review/10

Look at the second test. 4.8GHz = 586W. AT THE WALL. So for the actually CPU consumption, shave like 15% off or whatever for PSU inefficiencies.
Read the comment I quoted, he siad the CPU was pulling 500w.
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