Overclocking FX-8320 on Sabertooth 990FX using only FSB (not multiplier)

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JTDDr

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Jun 13, 2015
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Hi everyone

I recently upgraded to a FX-8320 and I first attempted to overclock it using the multiplier in the UEFI BIOS. For some reason it does not like me messing with the multiplier. Whenever I changed it to even just 18 or 18.5, the computer reboots and I see a black "America Megatrends" screen saying "Overclock failed! Press F1 to enter setup". I am wondering why it doesn't let me change the multiplier? Did I lose the silicon lottery?

I read a lot of other people are able to increase the multiplier up to 20 or so without problems while also increasing the FSB.

However, it seems to have no problem with me increasing the FSB. (I set the CPU/NB Frequency and HT Link Frequency to AUTO). I am now running at FSB 225 (now it's saying my RAM Freq. is 1800).

I searched and found some guides and set all my UEFI BIOS settings to some recommended settings for overclocking:

AI Overclock Tuner: Manual
AMD Turbo Core technology: Disabled
CPU Spread Spectrum: Disabled
PCIe Spread Spectrum: Disabled
EPU Power Saving Mode: Disabled
CPU LLC: Ultra High (75%)
CPU/NB LLC: Very High (50%)
CPU Current Capability: 130%
CPU/NB Current Capability: 130%
Cool'n'Quiet: Disabled
C1E: Disabled
SVM: Disabled
Core C6 State: Disabled
HPC Mode: Enabled
Amp Master Mode: Disabled

When the OC fails (using the multiplier), sometimes it changes to some weird settings, it changed the FSB to 213 or something (which made my RAM 1439 MHz). My RAM is 1866 but my mb has always underclocked it to 1333 (@ 200 FSB).

here's some info about my system:
mb: 990FX Sabertooth
16 gb Corsair Vengeance DDR3-1866 ram
Samsung 850 EVO 250gb SSD
GeForce 670 GTX (+70/150 modest overclock using EVGA Precision 16)
Corsair H60 liquid cooler

aside: I tried using AMD Overdrive but it was not very stable and I lost a lot of frames in games (had stuttering). I undid the overclock, removed AMD overdrive and I get good frames again.


Any recommendations to get the best overclock? Should I keep increasing the FSB? Will it allow me to change the multiplier if I increase the voltages?

Thanks for any recommendations,
John
 
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J

JTDDr

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Jun 13, 2015
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Hi getochkn, I don't see any option to set the memory to DOCP. Is it under AI Tweaker or somewhere else? My BIOS version is from 2012. Should I update it?

Also update on the OC: I was able to get 4.3 GHz with 230 MHz FSB and 18.5 multiplier. I increased the Vcore voltage by only about 0.01V. This FSB sets the RAM speed to 1840 MHz (I believe). Not sure what the NB and HT speeds are but I've set them to Auto (think they're around 2200). I feel like I could push the FSB further and maybe the multiplier if I add more voltage, but the heat is the issue at the moment.

For the temps:
It is stable and fast playing games (stays under 50C all the time), but when running small FFT torture test on Prime95, it stabilizes around 55C core temp but I only ran it for 2 hours. I was worried because I read the max core temp for the FX-8320 is 62C. The idle temp I'm getting is 22-25C (around room temp). The H60 cooler is a low end liquid cooler so maybe it is having trouble keeping up. However, when I stop the torture test, the temp goes from 55C to 30C in about 5 seconds. I'm considering returning the H60 and getting a better liquid cooler but I'd like to stay under $100.

For the air flow in the case:
I added a second fan to the radiator so it's push-pull. My case is Rosewill Thor V2 and has a 140mm intake (front), 230mm intake (side), 230mm exhaust (top), and I set the 120mm radiator to exhaust out the back.

(I also reapplied thermal paste to the cpu using the "pea method" while the case was layed flat.)

Any suggestions? Thanks
 
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C

captainmumoy

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Jun 15, 2015
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memory profiles use the xmp profile, that processor should be able to hit 4.2-4.3 with next to no increase in vcore, your temps are just fine, BUT, water cooler vs my hyper evo 212, your over my temps, your case has PLENTY of cooling, can you get a screenshot of when you apply the multiplier? seems rather unusual to overclocking fail at that LOW of an overclock
 
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