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[OFFICIAL] AMD Phenom II x4 Deneb CPU Owner's Club - Page 80

post #791 of 1264
Quote:
Originally Posted by bond32 View Post

I can't seem to stabilize it for anything over 4.4. What is the difference between "CPU NB voltage" and "NB voltage"?

Most of the overclocking guides for the phenom 2 are before the 990 chipset so I think things are different. I am putting 1.64 volts to the cpu right now and it still restarts in almost the exact same spot every time during benchmarks which makes me think I am missing something or the NB isn't what it should be. My temps never get above 54 C at full load. Board temps are always under 38 C too so no issue there.

http://valid.canardpc.com/2758502

Messing with the HT link speed and voltage seems to have no effect on stability. Right now I upped the "NB Voltage" rather than "CPU-NB voltage" and im going to try to run some benchmarks after class.

Also I disabled LLC as it was causing issues. I know for other cpus this is needed but seems for my setup it was causing problems.

 

Chances are that you wont get stable over 4.4, because like a mentioned a few posts up, these chips need cold temperatures to scale very much past that.  

 

CPU-NB voltage is what you want to be raising for NB clocks.  Try to aim for around 1.35v - 1.40v to get a NB of around 2.8ghz to 3ghz.  Also try to keep the HT link close to 2000mhz, because its the most stable there and it doesn't really increase performance if you raise it.

 

Don't mess with the NB voltage.  This voltage helps the FSB to clock high, but it's not needed unless you're shooting for 350+ fsb.  

 

Also, these chips tend to get unstable when approaching 55 C, so try to keep it lower if you can.  Below 50 C is a good temp to shoot for.

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post #792 of 1264
Quote:
Originally Posted by HobieCat View Post

The H100 will definitely be better than the Mugen 2, but I'm not sure how much better of an overclock you'll be able to achieve with it (if any).

Your sig says that your chip is already at 4.4ghz on air, so I really doubt that it will go much further for a 24/7 clock.  More so than anything these chips scale with cold, and I dont meant the 5C difference you'll see from the H100...I mean going sub zero.  You're not going to be able to go much further than you 4.4ghz OC for any length of time unless you start dropping temps drastically.

I completely agree and this is why I haven't spent the money for one yet. I'd really like to run a chilled water setup if anything to bring temps way under ambient but really phase is what's needed to take this baby to the next level.
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post #793 of 1264
Quote:
Originally Posted by bond32 View Post

I can't seem to stabilize it for anything over 4.4. What is the difference between "CPU NB voltage" and "NB voltage"?

Most of the overclocking guides for the phenom 2 are before the 990 chipset so I think things are different. I am putting 1.64 volts to the cpu right now and it still restarts in almost the exact same spot every time during benchmarks which makes me think I am missing something or the NB isn't what it should be. My temps never get above 54 C at full load. Board temps are always under 38 C too so no issue there.

http://valid.canardpc.com/2758502

Messing with the HT link speed and voltage seems to have no effect on stability. Right now I upped the "NB Voltage" rather than "CPU-NB voltage" and im going to try to run some benchmarks after class.

Also I disabled LLC as it was causing issues. I know for other cpus this is needed but seems for my setup it was causing problems.

Exactly what HobieCat said. Your simply temperature limited. Try setting up you PC outside in dead of winter and you'll see what were talking about. The higher OC you go the lower the temperature threshold for stability. This gets quite drastic the farther you go.
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post #794 of 1264
Quote:
Originally Posted by FlawleZ View Post


Exactly what HobieCat said. Your simply temperature limited. Try setting up you PC outside in dead of winter and you'll see what were talking about. The higher OC you go the lower the temperature threshold for stability. This gets quite drastic the farther you go.

 

Yes, yes it does.  Here's a rough estimate of the temps I need for OCs on my 955.

 

4.0ghz @ 50C

4.5ghz @ 30C

5.0ghz @ 0C

5.5ghz @ -70C

6.0ghz @ -120C

6.5+ @ -190C

 

If I recall correctly, this one needed -192C to get here:

 

 

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post #795 of 1264
Hey has anyone here made voltage profiles of their chips? Like making a table or chart graphing what voltages are needed to keep their chip stable at such and such speed in clearly defined increments?

Ive tried looking for one to use as a reference for my 940 (C2 stepping if anyone was wondering), but i cant really find a damn thing and am tempted to make one of my own before posting it.
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post #796 of 1264
Quote:
Originally Posted by Cyrious View Post

Hey has anyone here made voltage profiles of their chips? Like making a table or chart graphing what voltages are needed to keep their chip stable at such and such speed in clearly defined increments?

Ive tried looking for one to use as a reference for my 940 (C2 stepping if anyone was wondering), but i cant really find a damn thing and am tempted to make one of my own before posting it.
My two 720 B.E. C.P.U.s could achieve 3.4 GHz with two cores at the same voltage, but my 3+1 phase motherboard needed an extra bump of .25 voltage to maintain stability versus my 4+1 phase motherboard, so phase count or motherboard V.R.M.s should be considered.

On my 3+1 phase board, I got my x4 720 B.E. to 3.2 GHz via 1.375 volts via its B.I.O.S. that drooped to 1.36 volts (this was a Gigabyte motherboard, and it added about 1.5 MHz to the base clock), and my other x3 720 B.E. in a 4+1 phase board (A7DA-S) got 3.3 GHz via 1.35 volts via its B.I.O.S.

I concluded that 100 MHz could be attained via disabling a core.

Also, my 3+1 passed 20 hours of Prime95 Blend at x4, 3 GHz and the stock 1.325 volts via its B.I.O.S.
Edited by L4dd - 4/5/13 at 4:09pm
post #797 of 1264
Thanks for the help. Good stuff here. Suppose I will shoot for a solid 4.3 with the ram as best I can go.
post #798 of 1264
hey will changing my thermal graese to a higher brand bring down my temps much ?
post #799 of 1264
Doubt it will make a huge difference - did you try lapping the cooler base? You could also lap the CPU but may be risky. Best to focus on the airflow in your case instead.
 
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post #800 of 1264
Some swear arctic silver brings temps down a lot. I have always used it. The H80i actually comes with thermal paste on it so I could have saved a little I think and used it rather than the arctic silver.
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