Weird overclocking FX8350

[Goule]

Hi everyone,

 

Ok, so i'm overclocking for the first time of my life and i have a couple of issues.

 

FX-8350

M5A99X evo r2.0

16g corsair ram 1600 cl9

Corsair HX620W

and cooled with an H100i

 

so at 4000MHz using 1.32V i was getting 37C for the core temperature and 57C for the socket temp using Prime95.  I've seen that the max recommended for this CPU is 62c/70c so i have a lot of improvement available.  So far so good.

 

I went up a couple of times and i first noticed something i'm not sure about when i was at 4500MHz with 1.36 at 46c and 68c.  While Prime95 was running, all of the sudden, the temps started to get lower and lower up to 25c/47c and after a while it went up again and crashed.  When the temps got lower i noticed that the cpu load was still at 100% but the core went down to about 1600 and my multiplier went from 20 to 7 (using CPU-Z).

 

So i kept going to find the stable spot and i ended up with 4540MHz with 1.38V at 47c/71c (which the max recommended by AMD).  Very stable nothing is crashing the stress test can go on for hour but it still going lower from time to time with the same multiplier 7 at 1594MHz.

 

Is it me or those numbers are super low for this computer?  I was expecting to get about 4.8-5 with the water cooling.

 

And i also know that cpu slow themselves down when they're too hot.  Is it what's going on when i run prime95?  If so, isn't it supposed to send some kind of error message?

 

Thanks for helping

 

 

 

[t-scene]

When the temps cooled off and got warm again. It was thermal throttling. Your VRM's are getting hot and cutting power that's why it crashed.

That's the reason the multiplier changes also.

 

It will cut some cores back to save some heat.

 

 

I have the same board with a FX8320 the highest I could get it is 4.3Ghz stable with no throttling.  I have been able to get 4.7 stable with no VRM throttling but that requires a fan on VRM heatsink.

[CoolaxGaming]

If socket temps exceed 68 then it will usually throttle. 72c is where it will absolutely throttle.

[Goule]

When the temps cooled off and got warm again. It was thermal throttling. Your VRM's are getting hot and cutting power that's why it crashed.

That's the reason the multiplier changes also.

 

It will cut some cores back to save some heat.

 

 

I have the same board with a FX8320 the highest I could get it is 4.3Ghz stable with no throttling.  I have been able to get 4.7 stable with no VRM throttling but that requires a fan on VRM heatsink.

But now it doesn't crash and i still have this problem.  If some cores get cuts, shouldn't i get a lower load too?

[t-scene]

But now it doesn't crash and i still have this problem.  If some cores get cuts, shouldn't i get a lower load too?

It doesn't crash due to increased voltage.  No you will still be at 100% load on all cores, the ones it cuts are just running at lower clock speeds.

Try backing it off to 4.4Ghz and a little lower voltage.  Mine is 4.3Ghz @ 1.32500V

[t-scene]

Do this with you current clock speed and voltage.    Just take your stock cooler apart.

 

Id almost bet this would fix your problem...

If it does keep cranking it up till it starts throttling again. Then back it down a tad.

[Goule]

ok so here's some developments about my situation.  After a lot of changes i ended up getting something stable and without throttling.  4.3 with 1.34V for 42c/66c.

For a FX-8350 with water cooling, i find those numbers very low and way below my expectations.  I have a couple of ideas and questions...

 

1. Is there a chance it might be my PSU?  The one i use is the only part i took from my old computer.

 

2. Should i try to put the watercooling back with another thermal paste?  I'm not sure about it, but it didn't feel well applied when i installed it.

 

3. Am i just unlucky?  Since i know not all same processors are made equals.

 

4. Is throttling that bad?  I mean, my computer is slowed down after 30 minutes of running at 100% load.  I'll never use it that much with gaming.  Will I?

[t-scene]

ok so here's some developments about my situation.  After a lot of changes i ended up getting something stable and without throttling.  4.3 with 1.34V for 42c/66c.

For a FX-8350 with water cooling, i find those numbers very low and way below my expectations.  I have a couple of ideas and questions...

 

1. Is there a chance it might be my PSU?  The one i use is the only part i took from my old computer.

 

2. Should i try to put the watercooling back with another thermal paste?  I'm not sure about it, but it didn't feel well applied when i installed it.

 

3. Am i just unlucky?  Since i know not all same processors are made equals.

 

4. Is throttling that bad?  I mean, my computer is slowed down after 30 minutes of running at 100% load.  I'll never use it that much with gaming.  Will I?

Like I stated before its simply the limits of the VRM's on that motherboard.

At any higher frequency the current draw is to high which causes heat and them to cut back.

VRM cooling is the only solution unless you get a higher end motherboard.

 

Throttling is bad that's considered an unstable overclock when the thermals get to hot.