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Help overclocking FX-8350

post #1 of 12
Thread Starter 
Hey guys, had this chip almost two months and have been trying with minimal success to overclock it. Even at a slight oc (4.2ghz with no increase in voltage), my chip multipliers cut in half after about 2-3 mins of P95. I'm running an Asus M5A99FX Pro R2.0 motherboard and am cooling the processor with an Antec Kuhler 620. I know it's not the best closed loop cooler but I should be able to hit 4.5ghz without heat becoming an issue? Anyways, any help would be greatly appreciated! Thanks in advance
post #2 of 12
Do you have the power saving functions turned off? Your multiplier shouldn't be changing if the settings are all configured appropriately. The other possibility is that the cooler is mounted wrong somehow and the chip throttles for thermal reasons. Those are just my gut reactions though.
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post #3 of 12
its not power savings as they tend not to kick in at full load.

if your board hasnt got heatsinks on the vrms, its a thermal protection to stop the vrms breaking.

i had a asus board and researched this thoroughly, i even timed how long it takes to throttle.

edit just googled your board, seems they are heatsinked, but they will still throttle.

check cpu temps, if they are fine. maybe its a bios setting (cpu heat control or something)

if not, put a fan blowing at the vrms and test again
Edited by d1nky - 5/15/13 at 12:35pm
post #4 of 12
Thread Starter 
I have all the power settings disabled, the cpu temps hit around 55 before it starts to throttle. The vrm's I think are the culprits, even with no added voltage going through the board I can't even touch the heatsinks over them as they get to hot to touch
post #5 of 12
they are the culprits.

if you google am3+ phase design youll find a thread on here about boards and their phases. a section/column of that says 'vrm protection' and all asus boards throttle to lower the temps/protect the vrms.

and saving features are when the mobo/cpu are doing nothing, however sometimes causes instability at high frequencies.

i was overclocking the m5a78lm which isnt heatsinked, i modded my vrms with a fan/heatsinks and throttling times dropped.

if you want to experiment i suggest;

1.fan blowing on vrms
2. fan blowing on back of mobo where vrms are located.
3. get ambient temps very low.
4 LLC settings have a huge impact on vrm temps. more equals more heat.
5. same with vcore.

i bet its frustrating as hell, it will do it at stock as well. but youll notice (i timed) different settings = different throttling times.

its all based on the temps of the vrms. im not sure what the threshold is as i didnt/couldnt monitor them
post #6 of 12
Hi.
VRM info

Your mobo is ok. With that out of the way,
1. In Windows power options, make sure that Best Performance is selected.
2. Prime 95 and FX chips have a bad reputation, can't cooperate well. Try by using OCCT or IBT instead.
3. Other than this, do what d1nky suggests, get a fan blowing air in the VRM area, and experiment.
4. Consider doing a Clear CMOS for good measure.
   
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post #7 of 12
i know his board is fine, but guessed ya missed the part about vrm protection.

he said he couldnt even touch his heatsink as it gets too hot..... mine get warm on my fatality. if they burn ya finger..... i reckon those vrms are burning hot!

LLC/voltage cause a lot of vrm heat.

even if your psu isnt 'brilliant' the vrms get hot. something to do with ripple and amps i think.

ive even modded my new build to have a fan blowing on the circutiry to cool the vrm circuit as heat will cause phases to drop which knocks prime out.

im not an expert, but ive dealt with this first hand on a worse board. ive tried/tested and experimented to stop it. and the only thing that does is cooling vrms.

and on a side note, i dont think your vrms should get to the point you cant touch them after minutes of full load.
post #8 of 12
doh.gif Missed the VRM heating part, indeed.
Yes, the problem is throttling because of VRM overheating. Therefore, my suggestion that op follows d1nky's instructions still stands... And consider changing thermal paste in the VRM heatsink if you feel up to it.
Btw, which PSU?
   
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post #9 of 12
a what who and huh? paste on the vrms or pads? if youve tried paste i may try this.......

but there wouldnt be a heat transfer problem if the sink is hot.

maybe your ambients are high, LLC is 100% or auto, psu not brilliant. 100% or auto LLC will heat them quite a bit, as theyre doing much more.

and i mention psu because theres a massive difference between 'clean' and 'dirty' power. i have had a crap psu in the past and my temps were always high, changed it to the xfx (basically a seasonic) and temps dropped/stability improved.

but just try and cool them as much as possible.
post #10 of 12
I would like to add as a side note that 55c is pretty high for an AMD processor. Their max rated limit is 62c so if you get over 65 ever I would be a bit worried. That's like hitting 90c + on an Intel chip. Just wanted to throw that in.
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