FX8350 @ 4.6ghz OC

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clessers

Commendable
May 11, 2016
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Hey Everyone,

Brand new to OC'ing, and doing my first OC.

4.6ghz currently - voltage set to 1.40. I have run a preliminary prime95 (blend on all 8 cores) for 20 minutes. I will run a multiple hour test tonight, but as I adjusted the voltage / ratio upward I was only running a 10 - 15 min stress test.

my Thermal Margin minimum was 14C. Does this seem to be a reasonable OC?

Cooling: Noctua D15
Motherboard: Asus Sabertooth R2
RAM: 32gb @ 1866
 
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62'C is the max temperature AMD engineers deem as safe, which is of course a conservative number. The real safe-zone is somewhere in the mid 60's. The chip will throttle around 70'C if you have core features enabled.

Yes. You can use load line calibration (LLC) to avoid Voltage drops and gains which will in turn decrease your MAX tempature. Setting it to medium or high as opposed to extreme will force the motherboard to provide a constant voltage to the CPU instead of it bouncing around for conservation purposes.

Ultimately you will hit a wall with air cooling. That wall will be around 1.45 volts and 4.8Ghz with an 8350 on air, maybe a bit lower on both points, but that's what you should see. Liquid cooling will allow you to go up to...
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That voltage is kind of high to me. I have an 8370, not OC'ed, it runs at 4.3Ghz at 1.260 Volts. You may want to try lowering your voltage, it can lead to lower temps. Also, I'm assuming you're using OverDrive to monitor your temps. Download Open Hardware Monitor so you can look at the socket temperature. Max socket temp is 70C, max core temp is 61C (although you may want to keep core temp below 55C for longevity)
 
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You've just got a freak chip and I'm willing to bet you're not actually stable at that voltage as it's lower than stock.

1.4 is very low. My 8320 @ 5Ghz takes 1.55 to stay stable.

 
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Your board is compensating for vdroop under load mate.
Run a short prime test with cpu-z onscreen , the CPU voltage there shown will be max voltage under load.

1.44v is both fine for board & CPU under 100% load - if anything its better than average.
 
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Given the images I provided earlier - would you guys think that a 4.6ghz OC is the higher end of my safe limit? Do you think it is possible to get to 4.8ghz? I am not really sure what to do on this - currently I am hitting a MAX temp of 54C - being a AMD 8350 I have read that 61C is the limit you would want to go.

Are there any tricks within the BIOS that you guys know of that may give me stability with lower temps? Or is moving to liquid cooling the only real way I could push on to 4.8 - 5.0 ghz?

On the flip side, I cant imagine my temperatures ever getting this high while playing games - I doubt I will use 100% cores on a real world basis. So maybe I could push to 4.8ghz?

Any advice is appreciated.

Thanks!
 
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62'C is the max temperature AMD engineers deem as safe, which is of course a conservative number. The real safe-zone is somewhere in the mid 60's. The chip will throttle around 70'C if you have core features enabled.

Yes. You can use load line calibration (LLC) to avoid Voltage drops and gains which will in turn decrease your MAX tempature. Setting it to medium or high as opposed to extreme will force the motherboard to provide a constant voltage to the CPU instead of it bouncing around for conservation purposes.

Ultimately you will hit a wall with air cooling. That wall will be around 1.45 volts and 4.8Ghz with an 8350 on air, maybe a bit lower on both points, but that's what you should see. Liquid cooling will allow you to go up to 1.55 volts and 5+ghz safely. Custom loop cooling can go even further.

My 8320 is now @ 5ghz and 1.56 volts using a H100 240MM liquid cooler. I had an 8350 but my ASUS board fried and took the CPU with it. It was at 5.2Ghz They're in RMA and should be back soon.

When you are overclocking and using liquid cooling the number one component that must retain airflow is the motherboard VRM's. If these lose airflow in an 8350 overclocked build, they will burn up in smoke faster than you can reach for the power button. When you are using air cooling, the VRMs get airflow from the CPU cooler. When you switch to liquid, the airflow is removed and an additional 80mm CPU fan is needed to create airflow.

In this picture you will see the area I have circled in red as the VRM's. You must keep these cool at all costs. If you don't believe how hot they get, put your finger on a choke when you're at full load. They'll burn your finger at stock clocks and voltages, imagine when you're overclocked. Airflow is key.

http://i.imgur.com/dTjC7tQ.jpg
 
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Solution
@TheMastererr - Thanks for all the info! I have found it very helpful. I do have 1 last question for you. In your last post you circled those 2 metal heat coils on the motherboard. Could you please look at this picture? http://imgur.com/a/EdmAb - you may notice that on the left side I have a 120mm fan that is sitting very close to 1 of those heat coils. Do you think this will cause any problems? I was thinking it would be OK because I dropped the middle 140mm fan down a little to blow air at that heat coil. What is your opinion?
 
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I'm not kidding you! I know it sounds crazy, it's been running like this ever since October 2015 and it has never blue screened or anything like that. It'll do Prime95 for 24 hours no problem.
Huh, then I guess don't mind me because I got a chip that doesn't need as much voltage lol. Hey now that I think of it, 1.4v isn't bad, sorry for what I said earlier I didn't mean to confuse anyone.
 
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