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AMD® Phenom™ II Overclocking Thread

liamcrane: Hello and welcome to the thread! :) . . . looks like you have some nice hardware there so you come to the right place . . . It is generally expected that people just joining a thread read it first so that's what you should do (post #1 here). . . please make sure you read the "Welcome Post" here and there is a really basic starter guide here . . . It should take you one to two hours to catch up . . . if we don't do it this way then the same info gets repeated again and again . . . good luck! :cool:
 
Been having fun and games with my setup.

big.wayne can testify to me running 200x19=3800Mhz on 1.425v which prime95'd perfectly fine for nearly 15hours the other day.

I decided to play with the CPU-NB as I read (from "unleash the Dragon" document) that, thats where the performance gains lay. Set CPU-NB to 1.3v and upped CPU-NB frequency to 2400Mhz - prime95 ran for 4hours then rebooted my PC. So I gave up with that and decided to go back to the settings above (just oc-ing my CPU). Left it running prime95 blend overnight expecting it to be fine and dandy this morning and my PC had rebooted!!! :( :(

Shutdown to restart my PC, PC refused to boot (wouldn't even get to BIOS screen) - I'm assuming this is the OC-ing bug people here have mentioned so shutdown PSU - then restarted - PC booted fine. I've left it priming again whilst I'm at work today in the hope I will return to it still priming - Wierd that the same settings I test two days ago are now failing (Just CPU overclock) after messing with CPU-NB....

Quick question - only setting that was different was C1E was disabled last night - surely this is supposed to be disabled as per AMD instructions? Just wondering if it could be that, thanks.
 
zoomee: again, i have had that. I also got worried that my settings where not stable however after leaving the machine unplugged for a hour or so and then trying again it would be okay. Not sure if its these asus boards or something...
 
I have not had that problem with my Asus. But C1E does seem to do odd things. I tried to turn it on for the first time yesterday (hoping for cooler idle/partial load temps) and my computer booted fine and then crashed almost immediately.

So I turned it off and turned C1E off in the Bios again, it booted up fine apart from my mouse drivers had been uninstalled so I had to do a bit of unplug - plug in to get the mouse to move. Really odd. :)
 
my problems occured after disabled C1E!! :(

Just been home to check it out - PC has rebooted itself again :(

back to stock and primeing again for stability - lesson learnt - don't mess with CPU-NB or HTT!!! - I'll stick to simple CPU overclocking if it starts working again.
 
I think others will back me up in saying that I dont think that is the right lesson to learn. Most people on this thread have clocked the nb and ht and none have had problems.

Having said that I dont know what the cause is so I cant rule it out. I am guessing the original set up was not completely stable and something has changed to make that more obvious. Perhaps the warmer weather? Or perhaps clocking the nb increased the temps enough to reduce stability?
 
I think its the case that you pretty much *have* to clock the nb to around 2.4/2.6 for the phenomII to become stable at much over 3.8ghz, this is what i've seen on other forums at least. If the NB is too slow you start getting memory issues becuase of the "lag" involved so to speak.

Just an idea, but perhaps we should start compiling everything we've learned about these processors and put that info in the op :)

Like for example;

These processors scale better to cold than to more volts, its easier to get 3.8ghz stable by shaving some degrees off of your load temps as opposed to putting an extra .5v through it.

If we compile all of this information, and what stable settings people have achieved, it will help all of us get better clocks, and also help the newcomers

(apologies if this has already been suggested, but its a long thread....)
 
I fancy boys: Yes agreed. I have noticed i cannot be stable at 3.8Ghz unless the NB is 2400-2600. If i leave it at stock, it will fail.
 
thanks for the input guys.

My point is that it was rock solid stable @ 3.8Ghz earlier this week @ 1.425v. Nothing has changed other than I tried to oc the CPU-NB and now i've got problems running the 3.8 again (just oc-ing the CPU and not the CPU-NB). The Dragon manual does clearly state though that there is no point in trying to OC the CPU-NB if it causes instability over the extra Mhz on CPU oc-ing....

I'm pretty sure the Oc-ing of the CPU-NB problem was caused as a result of me already using DDR-1600 as my standard memory settings - I'd rather just keep that along with a 3.8Ghz OC on the CPU than start messing with CPU-NB/HTT settings....

My CPU also does not go anywhere above 47Degrees C (coretemp) so don't think heat was the problem either....

I have to agree though - An overclocking table with peoples settings would REALLY help us noobs :)
 
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