Can't get FX 8350 OC stable no matter what I try.

[Fordefy]

Hi, I'm new to the forums. As the title says I'm having trouble getting my overclock to be stable.

Some basic build info:

CPU: FX 8350 (VID: 1.2875V)
Mobo: Asus m5a99fx pro R2.0
PSU: Corsair CX750W
GPU: Asus GTX 770 2GB
Ram: Adata XPG V1.0 1600 MHz CL11

I'm trying to FSB overclock (Mainly because I want better single thread performance out of my 8350). I've turned all the power saving options (ie: CnQ) etc etc off. I will upload pics of my Bios in a couple minutes but here is the failure I'm getting form PRime 95:

https://imgur.com/n440L7B

Here is the imgur album with all the Bios settings

https://imgur.com/a/TaVdf

Note: In the bios pictures you see that my arm is set to 1241 Mhz. I lowered to see if it would fix the unstable OC but it didn't work. Before that it was at 1546 and I would still get the rounding error. Essentially no matter what I do I keep getting the rounding error. I'm thinking it may be my ram speed and/or timings but I'm not sure.Any help will be appreciated.

 

[Johan45]

My guess would be you need a touch more voltage but I would like to see the memory tab and SPD tab from CPUz just to check ram speed and timings. As I said though 4.5 is getting in the 1.4v+ range for a typical 8350 there are exceptions but this is the "norm" Just keep an eye on the socket temp( CPU) try to keep it 70c or lower.

 

[Fordefy]

Uploaded BIOS pics and here are the Memory and SPD tabs

https://imgur.com/a/viUNG

I have a Noctua NH-D15 CPU cooler so the core temperatures never go above 45, the socket usually gets to 65 max. So should i bump up the voltage?

Also I tried + 0.03125 on the Vcore and instead of the rounding error (Like in core 7 of P95) I would get the sumout error (like in core 5 in P95). Should I go up to +0.0375?

 

[Johan45]

Yes bump it up again, I would also add .05v to the base ram voltage.

 

[Fordefy]

Yes bump it up again, I would also add .05v to the base ram voltage.

Alright I upped the voltage when you first made the suggestion to +0.0375 and and I just got rounding error once again at 1 hour into p95 test. Do you suggest just upping the ram voltage to 1.55 and retrying? or upping vdimm to 1.55 as well as increase vcore to +0.04375?

 

[Johan45]

Try the ram voltage first and also add 1 bump to the CPU_NB voltage. You're pretty close to being stable so let's see if this will work. If not then you'll need to add more V_Core.

 

[Fordefy]

I just got an "ILLEGAL SUMOUT" after 28 minutes. Increased voltage to +0.04375 and dimm still at 1.55. Gonna try this again.

 

[Johan45]

OK did you add to the CPU_NB voltage at all?

 

[Fordefy]

I didn't see your suggestion of bumping up nb voltage by 1 point. I'm gonna go back to Vcore +0.0375 and I'll add +0.00625 to NB. Would that be enough or should I do +0.0125 to NB?

 

[Johan45]

How did your testing go this time. Pass or fail?? I'd go with the .0125 myself.

 

[Fordefy]

How did your testing go this time. Pass or fail??

Well I stopped it (The +0.04375 test) at around the 10 minute mark once I saw your comment about the NB voltage. Didn't want to add more Vcore if the problem was purely NB voltage. For voltages I'm at Vcore +0.0375 and NB Voltage I added +0.00625. Dimm is at 1.55v. Right now I'm running P95 custom test with %75 ram usage and I'm about 15 minutes in with no problems yet but usually I run into most of my problems at 45 minute+ of P95.

If this fails i'll try:
Vcore: +0.0375
NB Volt: +0.0125
Dimm: 1.55v

Temperatures so far on my current test haven't passed 59 Celcius on socket and 45 Celcius on core.

 

[Johan45]

Make sure it's the CPU_NB and not the NB, they're two different parts of the system.

 

[Fordefy]

Make sure it's the CPU_NB and not the NB, they're two different parts of the system.

Yep on the second pic of my bios, I changed the "CPU/NB Offset Voltage" to +0.00625. Will try +0.0125 like you suggested next.

 

[Johan45]

I'll be around for the next 20 minutes or so. If the added CPU_NB doesn't affect the stability then go back to V_Core. It's hard for me to judge where you are sitting voltage wise under load since all the FX CPUs have different stock VIDs. They have ranged from 1.29-1.39 depending on the actual CPU. SO as I said add some V_Core and test again with each failure. Just mind your temperatures. Max 62-65 on package and 70-75 for socket. If the socket gets too warm the board will throttle your CPU so if you notice it drops down to I think it's 1.4 and then jumps back up repeatedly that's throttling and you'll likely need to drop your speed a bit for stability.

 

[Fordefy]

I'll be around for the next 20 minutes or so. If the added CPU_NB doesn't affect the stability then go back to V_Core. It's hard for me to judge where you are sitting voltage wise under load since all the FX CPUs have different stock VIDs. They have ranged from 1.29-1.39 depending on the actual CPU. SO as I said add some V_Core and test again with each failure. Just mind your temperatures. Max 62-65 on package and 70-75 for socket. If the socket gets too warm the board will throttle your CPU so if you notice it drops down to I think it's 1.4 and then jumps back up repeatedly that's throttling and you'll likely need to drop your speed a bit for stability.

Alright thanks for all the help. Core Temp says my VID is 1.2875v if that helps. Hopefully this time around it will be stable (P95 has been running for 50 minutes and no errors yet). If not I'll boost the Vcore once again.

 

[Johan45]

Alright thanks for all the help. Core Temp says my VID is 1.2875v if that helps. Hopefully this time around it will be stable (P95 has been running for 50 minutes and no errors yet). If not I'll boost the Vcore once again.

Ha, I should have noticed that. I'm just not that familiar with core temp. Don't really use it. Looks like you have a decent CPU there so it wouldn't surprise me if it stabilizes fairly soon. Already running an hour + is a good sign. Good luck fordefy.

 

[Fordefy]

Ha, I should have noticed that. I'm just not that familiar with core temp. Don't really use it. Looks like you have a decent CPU there so it wouldn't surprise me if it stabilizes fairly soon. Already running an hour + is a good sign. Good luck fordefy.

Thanks for all your help. Just passed the 2 hour mark with the +0.00625 CPU/NB Voltage and the +0.0375 Vcore. That's good enough for me for now Got some work to do on the PC so I can't have it out of commission any longer. I'll try 4+ hours of P95 at another time but it should be good. Appreciate it.

 

[RGone]

Most of us in here over at least the last 3 years have generally settled on 2 hours of P95 Blend mode as most often enough for stability/stress testing. I know a couple of the guys that have helped in here the last 2 years or so have P95 Blend moded for 2 hours and passed and they never report failures during everyday use. Same here for me at the 2 hour mark. Of course I like as low temps as possible but 2 hours passing without error in P95 Blend has not shown any errors in my daily use.
RGone...

 

[Fordefy]

Most of us in here over at least the last 3 years have generally settled on 2 hours of P95 Blend mode as most often enough for stability/stress testing. I know a couple of the guys that have helped in here the last 2 years or so have P95 Blend moded for 2 hours and passed and they never report failures during everyday use. Same here for me at the 2 hour mark. Of course I like as low temps as possible but 2 hours passing without error in P95 Blend has not shown any errors in my daily use.
RGone...

Great That works for me. Thanks a lot.

 

[Johan45]

Thanks for all your help. Just passed the 2 hour mark with the +0.00625 CPU/NB Voltage and the +0.0375 Vcore. That's good enough for me for now Got some work to do on the PC so I can't have it out of commission any longer. I'll try 4+ hours of P95 at another time but it should be good. Appreciate it.

That's great Fordefy, as RGone says you're likely just fine the way it sits right now. The only thing I have found that may still crash after a P95 run of a couple hours is F@H and doesn't sound to me like you're into that so you'll be fine.