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FX8120 OC to 4.0mhz?

post #1 of 12
Thread Starter 
Hey guys new to the forum, my rig specs are in my signature, but concisely I'm running an 8120 with a stock cooler, I am new to OCing and have started reading all the 8120 threads but its difficult to discern what I should reasonably expect out of my system. I was hoping to take it to 4ghz with just cpu multiplies but i am an absolute noob to cpu OC, ive OCed my gpu but using BIOS to clock is a bit of new science for me, any help or suggestions would be appreciated. And yes yes i know search, i have just wondering what some experts thought i should do with my system

-tatum
post #2 of 12
Leave the FSB at 200MHz and the voltage at stock. Start by upping the multiplier to 18 and see if that is stable by running LinX 2048MB with about 10 runs. Monitor CPU temperatures with HWMonitor and make sure that the CPU socket temp listed underneath the voltages doesn't go above 70c and the CPU core temp further down stays under 62c. At these temperatures the CPU will start to throttle to reduce heat output. If you are getting acceptable temps, start upping the multiplier by 0.5 each time and run the stress test until you get errors in LinX , a BSOD , system hang or the CPU overheats. At that point, drop the multiplier back down to the last one that was stable and run a longer test to double check that it's stable. I would recommend that you do not change the voltage at all or exceed 4GHz on the stock cooler.
 
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post #3 of 12
Thread Starter 
Can you give me a rough estimate of time on the stress tester, in minutes/hours?
post #4 of 12
About 10 minutes to do 5 runs on LinX for each multiplier increase. Do at least an hour to check your final OC.
 
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post #5 of 12
Thread Starter 






I ran the CPU multiplier to 18 and rebooted, i crashed to boot within a minute, these pics are my stock BIOS settings and HWmon values at boot and idle, i feel like my temps are really high for stock. any assessment would be great.
post #6 of 12
I forgot to add, turn off AMD turbo core technology in the BIOS. It should be stable with that disabled. The stock cooler for the 8120 and 8150 are the same, so it should be able to handle 3.6GHz (18 multi) just fine.
 
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post #7 of 12
Thread Starter 
Alright so i started that and now I'm really worried after 3m 38s on LinX at 18x multiplier(3.6ghz) my cpu temp spiked all the way at 206*C, I immediately shut down linX. Runs at fine temps using linX at 3.2Ghz clocked using amd overdrive.

This is at 18X multiplier at idle, with my max temps from the stress test, am i doing something wrong or am i asking too much of system?



Another thing, my GPU is overclocked to 1063mV-1000mhz-2252mhz from 988mV-850mhz-2052mhz, would that make a difference?
Edited by tatumthunderlip - 2/18/13 at 7:37am
post #8 of 12
Those are some very strange readings, 3 things jump out as being very unusual. Firstly, the 12v reading on the motherboard is really out of spec at 14.96V. It should be within 5% of 12V (12.6V max). This could be an incorrect reading or your power supply has some very serious problems. Secondly, the CPU voltage is showing to max out at 1.48V. It should be more like 1.3V-1.35V. If you have turned off turbo, the voltage should not be spiking up like that under load. Thirdly the CPU temperature should not be getting anywhere near that high. At around 65c the chip should start aggressively reducing the frequency and voltage in order to bring temps down. At some point, I think around 100c, the CPU will shut down the system instantly.

I recommend you bring the multiplier back down to the default, make sure turbo is off and try stress testing again. Pay attention to the 12V, CPU voltage and temperature. If any of them are out of the ordinary kill the stress test.
 
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Antec 1200 Logitech G700S Asus Xonar D2X Microlab Solo 7C 2.0 
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AMD Athlon II X2 260 3.84GHz Gigabyte GA-78LMT-USB3 Nvidia 8800GS 384MB Corsair XMS3 4GB 
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Seagate 320GB Windows 8 64bit Kubuntu 12.10 64bit Tulip CRT @ 1920x1200 75Hz 
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Bulldozer FX-8120 4.7GHz Asus M5A99X EVO 990X HD7970 3GB 1265/1560MHz HD5770 HTPC 
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Samsung 30nm Green 16GB OCZ Vertex 4 256GB Samsung SPF1 1TB Seagate 3TB 
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Antec 1200 Logitech G700S Asus Xonar D2X Microlab Solo 7C 2.0 
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AMD Athlon II X2 260 3.84GHz Gigabyte GA-78LMT-USB3 Nvidia 8800GS 384MB Corsair XMS3 4GB 
Hard DriveOSOSMonitor
Seagate 320GB Windows 8 64bit Kubuntu 12.10 64bit Tulip CRT @ 1920x1200 75Hz 
PowerCaseMouse
Corsair Builder Series 430W Lian-Li PC-A04B Logitech G5 
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post #9 of 12
Thread Starter 
Just as i got this post, i crashed during stress testing and now i cant power up at all, the power supply will blink on for a second after i unplug it and plug it back in. Everything seemed fine and all of a sudden, no extreme temps as far as i can tell. Is it possible i burnt my power supply or is it more likely i cooked my cpu and mobo?

my mobo will start up without the cpu plugged in, but i cant get any power whatsoever with it plugged in... ugh, when its on the multi-meter reads 12v at the cpu power output.
Edited by tatumthunderlip - 2/18/13 at 3:17pm
post #10 of 12
hello,
I don't think its possible to reach 4ghz safely on the stock cooler. I had a Zalman performa with push and pull and 4ghz was just about possible. you really need to improve your cpu cooling before you try to overclock.
I can tell you that under full load the voltage should only be 1.284v to keep an 8120 stable at 4ghz.
    
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