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OC to 3.8 GHz on a Phenom II 720

post #1 of 9
Thread Starter 
I have a Phenom II 720 that I cannot seem to get above 3.6 GHz without it becoming an unstable wreck. I have my CPU/HT clock @ 200 and my multiplier @ 18. My DRAM frequency is 1067 with the timings set to 7-7-7-19. My CPU voltage is set to 1.55v, my NB is set to 1.412v and my DRAM is set to 1.605.
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Shnayvetchen
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post #2 of 9
It happens.

seems you have a black edition 720. I think that means its guaranteed to be a C2 stepping.

3.6 to 3.8 is the general max youll get. There are some lucky people around here with C2's between 4.0-4.2 seen a handful even further than that.

however its luck of the draw, and the 720BE was like the worst luck of the draw in general. :\\
post #3 of 9
Quote:
Originally Posted by kabj06 View Post
I have a Phenom II 720 that I cannot seem to get above 3.6 GHz without it becoming an unstable wreck. I have my CPU/HT clock @ 200 and my multiplier @ 18. My DRAM frequency is 1067 with the timings set to 7-7-7-19. My CPU voltage is set to 1.55v, my NB is set to 1.412v and my DRAM is set to 1.605.
well there you have it, your 720's possible max is@ 3.6ghz, if you're on 1.55v and can't get nowhere, then that's about it. now are you on multiplier or fsb or combo? list more stats and see if we can squeeze an xtra mhz or so.
IVY
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post #4 of 9
3.6 to 3.8 is a good oc for that chip. i would try to stay below 1.5 for the oc though. if you can get 3.6 around 1.475, it would be less stressing on the chip. but thats just my opinion.
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post #5 of 9
Thread Starter 
Ok. Seems I can't get above 3.6. When I unlock the 4th core it goes nuts. I have a feeling it's a bad core but do I need to do more voltage tweaking?
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Shnayvetchen
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post #6 of 9
i ge 3.6 at 1.475

my 4th core unlocks no problem but it seems firefox always crashes, i havint tested i much so far.
a 4th core does not really matter much for now anyway
i will be going BD when it come sout
post #7 of 9
Thread Starter 
As I have read, some of the 720s are rebadged 820s with a bad 4th core. As for BD I really hope it gives Intel a run for it's money. The same way the original Athlons sent Intel into the dump.
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Shnayvetchen
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post #8 of 9
Through the 2 that I had, only 1 went above 3.6 without crazy voltage. I had it to 4.0 booting into windows on 1.6, but anything outside of launching CPUz would crash and burn. I ran it at 3.8 ~1.55 for a while before the memory controller started dieing. lol The one AMD sent from RMA would hit 3.7 ~1.55, but not very stable, and I was done killing chips.
When they first released many people thought that the lack of a 4th core would give lower temps and a higher overclock. But it seems there is a "voltage leak" that comes with a dead core (probably just a theory).
3.6 is a nice OC with one of those chips and 3.8 is darn nice. Your next step should be working with the FSB. Sometimes lowering the multi and raising it can get you a few hundred extra Mhz.
I also noticed you have an ASUS motherboard. The 3 M4N72-E's that I went through would hit 2600 HT/2600 NB easy. Good luck!
Oh, and check out Dolk's guide to AM2+ overclocking if you haven't already, there's some good stuff there.
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post #9 of 9
I have the same issue with my 720 BE C2 stepping, looks like C2 are the worst !
First of all my 4th core won't unlock with the right mobo and bios.
Second, I was unable to hit 3.6GHz (stable) with 1.50 vCore and thats alot of voltage to hit that speed i would have to increase it if i want it to be stable (but i would NOT) .. after alot of work arounds i settled for 3.5GHz (200x17.5) @ 1.45vCore, NB @ 2.4GHz, HT Link @ 1.8GHz ... temps are (min.35, max 49) .. take a look @ this thread it might help.
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