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Phenom II 955 BE - almost stable at 4.2 GHz?

post #1 of 54
Thread Starter 
First off, thanks for reading. This is my second overclock ever and I might be doing something wrong, but here are my current specs:

- AMD Phenom II x4 955 BE
- Asus M4A87TD EVO
- Corsair CMT4GX3M2A2000C8 2x2Gb
- PSU: Thermaltake Purepower 650w
- CPU Fan: Zalman 9900 MAX

And my current (OC'ed) settings are:
- FSB: 225
- CPU Multi: x18.5
- CPU/NB: 2.7 GHz
- VCore: 1.56v
- CPU/NB voltage: 1.25v
- RAM voltage: 1.65v
- RAM Freq: 1500 Mhz
- RAM Timings: 9-9-9-24

As you can see from the above, I'm running @ 4.2 GHz.
CPU Temps: 41º idle - 54º on full load. Not too bad, right?

Ok, one last thing to mention is that I'm on Ubuntu Linux which makes the overall stability better compared to Windows (fewer OC tools available, though).
In any case, the system seems pretty "stable": I can boot and work for a couple of hours. However, when running prime95 (or mprimer for Linux) 'Small FFTs', a worker always fails after around 2 hours. System does not crash nor frozes up. But can get the damn Prime95 test to pass.

Therefore, my questions to you folks are the following:
1) Is that TERRIBLE that Prime95 fails after +2 hours on full load? I mean, it's pretty rare that any program would consume all 4 cores at 100%, right? And, moreover, the system does not crash, it just fails to round up a number (remember, I'm just running 'Small FFTs' tests so far).
2) Should I keep upping the VCore? I'm at 1.56v, temp is not that bad (54º) but really don't want to force it since I'm targeting a 24x7 stable system.
3) I'm sure thing has something to do with some BIOS setting, but even though I set the VCore to 1.56v, the voltage sensor ranges from 1.45v-1.52v. Is that normal? Btw, Cool n' Quiet is disabled (I know it can mess up the readings).
4) What else could you think of in order to stabilize this system?

EDIT: check my testings here: https://spreadsheets.google.com/pub?hl=en&hl=en&key=0AvrG9zl8hC1WdG1hZ1pXeHhuVWtMVGFSblhKdHh6WUE&output=html
Edited by pablo.santiago - 3/26/11 at 5:58pm
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CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
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post #2 of 54
Possibly lower the multiplier and up the bus? Are ur mosfets heatsinked? Find out what ur max CPU/nb voltage is and up it a little more?

Any experts?
post #3 of 54
Wouldn't 255*18.5 be like, 4.7GHz?
Edited by falconkaji - 3/26/11 at 4:30pm
    
CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
PowerCase
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post #4 of 54
I would clock it down to 4.1 and call it good, that's a very nice overclock for a 955. My own 955 can't get near 4ghz and stay stable. So to be pushing 4.1 is pretty impressive.
post #5 of 54
Thread Starter 
Quote:
Originally Posted by jdouglas;12881819 
Possibly lower the multiplier and up the bus? Are ur mosfets heatsinked? Find out what ur max CPU/nb voltage is and up it a little more?

Any experts?

- I could try that, but already went from 200 to 225. I'm under the impression that Phenoms don't really like messing with the FSB and would rather need to play with multiplier
- No, mosfets are not heatsinked
- I don't think upping the CPU/NB voltage would do any good since I'm running tests against the CPU. However, 1.25v should be enough
Edited by pablo.santiago - 3/26/11 at 4:41pm
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post #6 of 54
Quote:
Originally Posted by falconkaji;12881849 
Wouldn't 255*18.5 be like, 4.7GHz?
That it would. He must have meant 16.5
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post #7 of 54
Ouch, 1.56V is a lot of voltage. Try different settings, maybe 19x222? Maybe you should lower your OC, after all 100MHZ doesn't make much of a difference(to me at least)
    
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post #8 of 54
If you have any way to get your CPU under 50c, I bet you could pull it off. In my experience, my 955 gets grumpy the higher it goes over 50c. Of course, 4Ghz is nothing to complain about either.
    
CPUMotherboardGraphicsOS
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PowerCase
Antec EarthWatts 650 NZXT Phantom 
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CPUMotherboardGraphicsOS
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post #9 of 54
Thread Starter 
Quote:
Originally Posted by falconkaji;12881849 
Wouldn't 255*18.5 be like, 4.7GHz? What is the stock speed for your RAM?

Damn, you're right. This is weird: BIOS shows 4717.5 MHz but system info shows 4176 MHz. I'll need yo check what's going on.
Stock speed (SPD) is 1333Mhz @ 9-9-9-24
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CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
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post #10 of 54
4717.5 won't happen, lol
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