I have been trying to OC my 970 for a couple of days now and have had trouble getting it stable. I have looked at guides and how to's for help but have had no success. I have tried many combinations of CPU-NB, NB and CPU voltages and speeds but none have been stable. I am aiming for 4Ghz (3.5Ghz stock). I got fed up with all the failure so I set the multi up to 4Ghz with stock HT and NB clocks and volts and put the CPU volt up to 1.5V (1.520V in CPUID) I have run it for 2 hours and has been stable, which is an hour longer that the previous failures.
I will run again overnight to make sure its good but is 1.520V too high? Temps maxed at 57° and 59° using speedfan (core and core2).
I have over-clocked most the CPU's I have owned and the fails usually end with a BSOD or a freeze BUT with this one I get an error in prime95 where one core will fail and the rest carry on (usually 3 or 4). the error has always been the same FATAL ERROR: Rounding was 0.5, expected less than 0.4.
Any advice would be much appreciated, also a side question, I left quiet and cool on but it doesn't seem to clock down when idle. is that normal?
CPU : Phenom II x4 970
Heatsink : Noctua C-14
Motherboard : GA-870A-USB3
RAM : 8GB (2x4) Gskill RipJaws
PSU : Ocz moodExtreme 700W
Windows 7 64bit
I had that cpu. it over clocked to 4.2 ghz on 1.456v. 58c high with prime95 for 9 hours. it ran beautifully for a year, then didnt like the overclock anymore. any time i applied any voltage to it it just jumped up in heat. i was only able to oc it to 3.8ghz, as thats all it would go to with no voltage increase.
i still have the cpu, works fine except for the no oc. its my new backup...
I may give it one more go with C&Q off... but I still think there is something dodgy with my chip. In CUPZ and the bios the stock voltage is 1.475V?!? I have seen people get stable at 4.0-4.3Ghz with this voltage, yet mine needs that for stock 3.5Ghz.
I will try 3.8Ghz at my stock volts and see what happens, the next step, +0.025V, will bring it up to 1.5V .
I dont believe it, its just gone to sleep! Well thats almost 5 hours without error, that will have to do... temps reached 50 so a little room left for more. disabling C&Q seems to have helped, cheers kiezz.
Will try 3.9Ghz tomorrow night, cant do it during the day because I need to use it. And this time I will make damn sure it wont go to sleep
Ok, I tried 240 x 16 @ 1.472V and primed for over 9 hours no problem. I also put the NB up to 2400 @ 1.25V and it does seem to be faster than 3.8 with just the multi changed. I stuck with 240 because my ram will still be at full speed.
Will boost the multi again tonight and see what happens, cheers kiezz. Will post what I manage to get up to.