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OCing Athlon II x4 640

post #1 of 28
Thread Starter 
So just this morning I started my first attempt at a good OC.
Yesterday I modified the bus clock to 267Mhz, keeping everything at stock,
Then right before I went to sleep, I confirmed stability (20 passes/high/Intelburn) at 3337.5Mhz (267x12.5), at untouched stock voltage (~1.34V).

Now this morning I took a go at pushing it to 3.6Ghz (267x13.5), and though I've pushed core voltage up to 1.475v, it still crashes within 5 minutes of IntelBurn.

NB and HT were at 267x7 each (1869Mhz) during this process, and I tried putting NB up to 267x8 (2136Mhz), just before I left the house, but no luck.
Once I get back home I'm going to try and feed it a little extra voltage, and raise the NB and HT a little more maybe,

But in all honesty I'm not so sure about my situation here.
Am I pretty much stuck at <3.5Ghz for OCing this CPU?
Or are there other things I could try? I do know of putting NB/HT voltage up but I'm not so sure abou that.

BTW for temps:
At stock, HWMonitor showed TMPIN0= around 30 Celcius/Core=12~15 idle, and load max 40 TMPIN0/25 core (ambient 15)
At 3.3 it was literally not changed.
And at 3.6Ghz, temps barely increased 5 degrees at load.
(typed this all on iPhone from memory, please excuse typos)

Dear Lord, please let this not be the wall. -__-
Edited by BPK - 2/6/11 at 2:15pm
post #2 of 28
Not sure if this will help you much but my 620 13x270 I put my NB voltage up to 1.21 and NB-CPU voltage up to 1.35v but my NB is now running 2700mhz and HT is just over 2100mhz....

CPU voltage is at 1.4v
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post #3 of 28
Thread Starter 
Hmmm, so NB Voltage could be the trick then?

I reverted it back to last known stable for now, which is 3337Mhz CPU, and 1869Mhz for both NB/HT, and stock voltages.
I'm terribly conflicted as to what would be the safest way to push my CPU past 3.5Ghz. I'm scared to end up frying my NB or something when messing with the voltages..
post #4 of 28
Hey.
No need in upping the NB volt if U didnt raise the fsb after the first OC atempt. U could try to up the CPU/NB volt a tad. And U could also try do upp the vcore. Ur temps seems fine so that should be ok.

Leave Ur ht as close to stock as possible - 2000Mhz. What U want to up is the NB frequense. The cpu/nb volt is the one to up when U raise the NB frequense. But do that when U have Ur cpu stable.

RAM spesifics? Stock and OCèd numbers.

Good luck and please let us know how it turns out.
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post #5 of 28
Thread Starter 
Ok I'll try some of that out.

RAM is actually now at 1068Mhz (267x4)
post #6 of 28
Thread Starter 
Could someone be so kind as to answer this for me:
(Either I can't handle Google, or it's not coming up anywhere)
I see CPU Voltage, and VNNB Voltage in the BIOS settings.
Would VNNB be the NB/CPU Voltage? I don't want to touch something without knowing.
Edited by BPK - 2/6/11 at 6:31pm
post #7 of 28
1.55v is safe so long as temps are <71 which is the max temp for the athlons. My NB is at 2500MHz at stock nb voltage

I run mine 3.62GHz 24/7 with 1.5v under load, temps are okay but not great with my TX3.

Likely, your RAM is giving you trouble, set it as close to stock speeds as possible and manually configure the timings.
post #8 of 28
Quote:
Originally Posted by BPK View Post
I see CPU Voltage, and VNNB Voltage in the BIOS settings.
Would VNNB be the NB/CPU Voltage? I don't want to touch something without knowing.
yes, correct
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post #9 of 28
Thread Starter 
Quote:
Originally Posted by ku4jb View Post
yes, correct
Thank you, I actually think that's the problem. As in, I put the NB back down below stock speed, and I've got a lot more stability; I just confirmed stability for an additional .5x as in now it's 267x13 (3.4).
I think my (apparently crappy) NB seriously needs a voltage bump for OC stability.

As for RAM, with the help of a friend the sticks were originally manual set to (in BIOS) 533(1066) speed, 5-5-5-15-20 timings. But as I was raising bus clock, then I had to put the RAM down to 400(DDR2-800), and the limit on TWTR was 3 instead of 5.
But I don't think that created an issue, because I have tested using HyperPI 32M 3 times now, including at the recent 3.4 Ghz OC.

Additionally, I bumped the voltage from stock up a lot higher, to ~1.42V to guarantee stability at 3.4Ghz.
I do hope my CPU doesn't have a really low wall...
Edited by BPK - 2/6/11 at 7:13pm
post #10 of 28
Thread Starter 
I think I may have hit the absolute wall at 3.471 Ghz... sorely disappointed, but I did bump VCORE all the way up to 1.5V, and it will not stable with that for 3.60 Ghz...

What would be my case here? I certainly hope this isn't the wall.

Is there anything I could do? As in, would something like overclocking the NB + adding CPU/NB voltage help the stability?
Temps at 1.5V/3.6Ghz are just around 50C, so I think that's fine.

Can I perhaps push the VCORE a little further, as my temps are pretty decent?
Update: I'm trying 1.513~1.516V and crossing my fingers that it's stable.
Edited by BPK - 2/6/11 at 8:09pm
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