Prime95 ERROR:ILLEGAL SUMOUT what is the most likely cause?

Ryan_78 · Mar 15, 2016

Ok, so When my friends FX chip is OC at +400Mhz speed, its fine, 24 hour prime95 stable, but when I tried to push it to +500mhz, prime95 almost immediately stops for 2 cores and says ILLEGAL SUMOUT and the other 2 cores are fine for a few minutes, but I haven't seen past 5 min, because of the first 2 warnings. Nothing has been touched but the multiplier and a slight increase in voltage. Turbo boost is off, but some other power saving features are still on, since the computer is idled sometimes. Temps don't go over 65 C under load. What could be the cause?

joex444 · Mar 15, 2016

You're running the CPU or RAM too far out of specification. Run Memtest86+, if it passes then it's the CPU telling you to back off. If the RAM is full of errors, then this error is memory related.

utroz · Mar 15, 2016

For an AMD cpu 65C is kinda high, under 60C would help. FX cpus are very temp sensitive so that could be causing the issue partly, also there is a wall around 4.8-5Ghz that most chips can not break without extremely cold temps.

Ryan_78 · Mar 15, 2016

Oh by the way it's capping at 4.3. I'll try the test joex444 brought up, but otherwise it shouldn't bee capped at 4.3 right, I mean 4.6 is more reasonable. And he is getting a new cryorig h7 by next week too, I'll see if that helps. Also I meant max temp is 65, but gaming it is under 60. Only extreme tests make it go 65.

utroz · Mar 15, 2016

Ryan_78 :

Other things that make a big difference is what motherboard you are using as the VRM setup makes a huge difference is how high you can clock. What motherboard are you using? How are the VRM temps? I hope that new cooler helps.

Ryan_78 · Mar 15, 2016

the motherboard is a gigabyte 970a-d3p I know its only 4+1, but it shouldn't be this bad? also vrm temps only go as high as 60. case has good 2x 140 and 3x 120 fans in it.

utroz · Mar 15, 2016

It does seem that the board is somewhat of a limitation even with good temps on the cpu and vrms.
Some things others have done with the same board are:
LLC to very high/ultra
Disable Turbo core, APM, c6, c1e
raise vcore to 1.45v
raise multiplier to 23
set bclk to auto

I got this info from the following thread http://www.overclock.net/t/1540474/fx-6300-and-ga-970a-d3p-and-evo-212-overclocking

Ryan_78 · Mar 15, 2016

ive set voltage to 1.416 and it seems to work, but I cant leave it on for more than 15min without the CPU going to 75 C, I'm just going to wait for the cooler and see if the voltage helps.

utroz · Mar 16, 2016

Ryan_78 :

Yeah till you have the new cooler you really can't do too much. Once you get the new cooler installed let us know how much your overclocking and or temps improve. Best of luck to you..

Ryan_78 · Mar 16, 2016

utroz :

alright ill reply back to this thread once the new cooler is installed
thanks

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