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Novice to overclocking, couple questions

post #1 of 9
Thread Starter 
Hello,

So I've got a Phenom II x3 720 here that I'm trying to push higher, but I'm a bit unsure of where to go from here. Basically:

3.6 won't last more than an hour or so of P95 even at 1.5375. I had it up to 3.5 with a sloppy 1.525v, 9 hours P95 stable, but I wasn't happy with that, and decided that I want to do it thoroughly, and do it right. So I started from scratch, following the AM2 overclocking guide here.

I've found my mobo's max ref clock; 290 was good through a half-hour of P95 (should I try to test it longer? Didn't like the idea of running a 6-12 hour P95 run just for the ref clock) although 292 won't boot and 293+ won't post. I remember hearing that there is sometimes a wall in this range on AM3 boards, and if you go through it and up the ref clock another 20-30MHz to 310+ you can regain stability, but can't find the source of that and don't want to mess anything up by pushing it that high in such a large jump. Can anyone confirm/deny this?

Now I am trying to find the limits of the CPU. Right now I'm back at 3.5 (200x17.5, just adjusting the multi for now) at 1.4625 and it's 2 hours into Prime95 small FFT. Temps are good, max is 34*C so far. If this setting is 9-12 hours stable, then this is the lowest voltage at this clock I've gotten. Where do I go from here? 3.6 won't last even with an extra 0.7v. I've left HT/NB speeds at 2000MHz and left voltages on auto. Would increasing the NB/CPU voltage help my overclock, even though I haven't touched the ref clock?
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post #2 of 9
Do u currently have the chip unlocked as a B** series chip or is it at stock 3cores...i ask this cause of your sig rig specs....if you do have it unlocked...there could be your problem, unstable core.
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by amd-dude View Post
Do u currently have the chip unlocked as a B** series chip or is it at stock 3cores...i ask this cause of your sig rig specs....if you do have it unlocked...there could be your problem, unstable core.
This is a different processor. The one in my sig rig is/was an Athlon 440, I just swapped in the Phenom 720 to try and push it.


If it helps, here's my CPUZ:
http://valid.canardpc.com/show_oc.php?id=1813542
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post #4 of 9
Ah i see...what about your RAM timings are they the same as the sig rig? what i would suggest is return everything to stock speeds and then start OC'ing with the multiplier only and when you get unstable increase the voltage, Or you can keep the current 3.5 OC and instead up the cpu-nb speed to around 2600-2800mhz (which is pretty much the limit on those chips) cpu-nb voltage is the same limit as the cpu itself 1.55v

Also do you have cool n quiet enabled (or any related power options eg C1E etc.) if you do have those enabled, disable them, right now we need to isolate the raw cpu potential then we can move forward and re-enable the power saving functions.
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by amd-dude View Post
Ah i see...what about your RAM timings are they the same as the sig rig? what i would suggest is return everything to stock speeds and then start OC'ing with the multiplier only and when you get unstable increase the voltage, Or you can keep the current 3.5 OC and instead up the cpu-nb speed to around 2600-2800mhz (which is pretty much the limit on those chips) cpu-nb voltage is the same limit as the cpu itself 1.55v

Also do you have cool n quiet enabled (or any related power options eg C1E etc.) if you do have those enabled, disable them, right now we need to isolate the raw cpu potential then we can move forward and re-enable the power saving functions.
RAM timings and speeds are loosened/lowered. Running at 1333MHz 9-9-9-24-33-2t 1.5v

Everything is currently at stock, except the RAM which is a bit below stock. The only thing that's raised is the multiplier and vCore.

All power-saving etc. options are disabled.
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post #6 of 9
the 720 is a b*tch outta the gate. not many will go past 3.5 and fewer will go past 3.6
be glad youre using an am3 board because it will help you immensely
all of this is also what ive collected and remembered from googling the world on this batturd of a cpu
your milage may vary
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post #7 of 9
Thread Starter 
Alrighty, I heard a lot of them hitting 3.6-3.8 a few months after they came out, guess they just got lucky.

And yeah, the first platform this CPU was in was an AM2+/AM3 DDR2 board, it wasn't even stable at stock speeds. Wanted to try this thing out in a decent AM3/DDR3 platform.
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post #8 of 9
Instead of a OC you can just try to unlock the extra core with stock voltage and then see what is the max OC you get with the stock volts with 4 cores. If the unlock is not successful with stock volts, bump it up to 1.4v that should do the trick. If it still does not unlock with 1.4v it's probably a true X3.
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post #9 of 9
Thread Starter 
It didn't unlock at stock/auto volts, didn't think to try upping the voltage. Will do.

Was stable for 5-6 hours at 3.5/1.475v, bumped it up one increment, hopefully this will get me 12 hours.
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