Phenom II 720

[remotehugger]

18.5 multiplier, 1.472 Volts, 3.7Mhz, 54c at load for 8 hrs. Do those numbers seem pretty safe? I am going to replace my intake and exhaust 120mm stock crapper fans with 2 Scythe 120mm Slipstream fans which will push/pull alot more air so maybe bring me down a few degrees. Any input would be great. Thank you

 

[remotehugger]

Strike that last post-just crashed after 9 hrs. and 15 min. at 1.472volts. Just bumped up to 1.502 volts. If that stays stable is that goiing to be safe ? Or would it hurt more in the long run ?

 

[remotehugger]

Well here i go again ! I cant get past this. I can get my Phenom II 720 stable at 17.5x with my FSB to 206 at 1.456 volts which puts me at 3.606Mhz with a load temp of 53c after 22 Hrs. of Prime. But i cant get stable at 18x with stock 200Fsb even after bumping my volts all the way up to 1.502 ? Am i at my limit? I would like to go a little higher but just cant seem to get there. Does anyone have any suggestions ?

 

[erdinger]

Increase the Nb frequency

 

[xtc28]

NB frequency will not help. On air this is all you will be able to do most likely. 54 degress is pushing a PII pretty hard. Personally, I have rarely seen them pass a 12 hr prime test at that speed and temp on air. The two chips that seem to have this problem are the 720 and the 940. While playing around with mine and customers to see if I could get any different, I found that it just normally doesnt work. Using the same setting I installed a cosair h50 water cooler and was immediately able to get to 3.8GHZ. Just by bumping up the multi. It ran stable for 24 hrs @47 degree load temp, at work on a cutomers machine Identical to my 940 rig. Then I tried a 720 with the same settings and hardware. Same result on air. I added the H50 Water cooler an there it was again 3.8GHZ. This time I had temps of 31 idle 45 load.

I feel that I must add that this is not for all PII 720's and 940 as I have seen some that would make it over the 3700 mark on air.

 

[erdinger]

My system wasn't stable at 3.6 gigaherz (never over 44 C) until I raised the Nb frequency to 2400 (even 2200 wouldn't be stable at 3.6). I would give it a try

 

[xtc28]

hmmm wierd normally it has the opposite effect

 

[erdinger]

From Dolk's guide to phenom II overclocking: http://www.ocforums.com/showthread.php?t=596023


"When you overclock your CPU, the higher you go the more likely you will need to stabilize the CPU-NB. What do I mean by this? As the CPU increases its speed to calculate data, so must the speed of which the CPU communicates with other components on the Motherboard: chipset, memory, etc. Let me take the classic example of a 4.0 GHz 940BE and its CPU-NB. If you were to leave the CPU-NB at 1.8 GHz stock then the data calculated by the CPU would create a bottleneck and thus resulting in errata errors or CPU errors. So in order to balance these speeds a CPU-NB clock of 3.0 GHz would be needed. In most cases of high OC’s that result in crashes; the CPU-NB is usually the culprit. "

 

[xtc28]

HMMMM wow I have always been able to get a better oc at 2000mhz NB no matter what frequency im OCing to. I say its worth a shot though.