Phenom 9950 Overclocking

[akaBruno]

i'm having a super hard time to get this thing stable at anything over 3.3 GHz. Any suggestions?

Be thankful you got that far.

Great chip.

Bruno

[HondaGuy]

I dont know what type of cooling you have but 1.35v- 1.4v for CPUNB can help stabilize things when running Higher NB..

Also if your Mobo has a CPUNB to SB voltage setting (this is for the comunication from CPUNB to SBchipset/Memory)
You can run this around 1.3v-1.325v with stock NB/SBchipset cooler.This helps keep the Ram stable and allows Higher Ram freqency and Tighter timing as well..

little things count with Phenom for Stable clocks. NB @2400mhz is good all around freqency..2600mhz and higher require real good cooling especially above 3.3ghz..You can usually clock Higher CPU with Less overall NBfreqency above stock paramiters..

Ive found,,
Stock CPUnbvolts = 1.3v up to 3.2ghz and say 2400mhz.

3.2/2000-2500 with 1.35vCPUnb
3.3/2000-2500 with 1.36vCPUnb
3.4/2000-2600 with 1.36v-1.4vCPUnb
3.5/2650-2700 with 1.55vCPUnb(max volts) My max stable.

By looking above ,, 2450mhz at any given CPU freqency with minamal xtra volts is ideal..

Of coarse this was with SB600 The Volts will be about the Same with 9950/SB750 for CPUNB..The CPU is main factor for NBvolts..Now a 750chipset( CPUnb to SBchipset) will be a little lower because the SB750 does a better job.

Hope that made sense..
Your Cooling will determin the overall Oc.
I just Try to find Max CPU clock @2200nb before raising the CPUNBvolts.. More CPUnbvolts will allow the CPU to Clock higher...Raise the CPUnb and Scale the Volts in Slow increments to find its max. Then Turn the NB back down to say 2200mhz with the Higher Volt setting.

Next try rasing the CPU clock Higher while keeping the CPUnb @2200mhz. You probally will be able to hit 3.4ghz no prob. For me to achieve 3.5ghz i have to run CPUNBvid @1.45v+ and above 2200mhz NB or 3.5ghz wont work. Each chip is differant. Ive found the Higher the Phenom goes the Nb seems best when raised a little above stock ,,Goes in hand with the extra CPU clocks//CPU performance.

CPU@ 3.3 NB@2600 HT@2600 stable at 1.55Volts

[equinox1]

Sounds good to me, give me some ideas for the bechmark. I'll d/l it now and when I come from the gym later I'll go ahead and start doing some benches.

maybe something like this

this series is at 3200 mhz,2000 nb, 2000ht, acc on auto, cpu voltage at 1.3875 and nbvoltage at 1.3750
on each succesive series raise nb by 200 and change acc +2. i'm curious how much variation there is between cpu and possibly board bios's on how they react. notice it took 1.3875 volts on my cpu. i had to set it there to run prime32. it seems to me other people are able to achieve higher clocks on less voltage but how stable are the clocks.

[Chicken Patty]

I dont know what type of cooling you have but 1.35v- 1.4v for CPUNB can help stabilize things when running Higher NB..

Also if your Mobo has a CPUNB to SB voltage setting (this is for the comunication from CPUNB to SBchipset/Memory)
You can run this around 1.3v-1.325v with stock NB/SBchipset cooler.This helps keep the Ram stable and allows Higher Ram freqency and Tighter timing as well..

little things count with Phenom for Stable clocks. NB @2400mhz is good all around freqency..2600mhz and higher require real good cooling especially above 3.3ghz..You can usually clock Higher CPU with Less overall NBfreqency above stock paramiters..

Ive found,,
Stock CPUnbvolts = 1.3v up to 3.2ghz and say 2400mhz.

3.2/2000-2500 with 1.35vCPUnb
3.3/2000-2500 with 1.36vCPUnb
3.4/2000-2600 with 1.36v-1.4vCPUnb
3.5/2650-2700 with 1.55vCPUnb(max volts) My max stable.

By looking above ,, 2450mhz at any given CPU freqency with minamal xtra volts is ideal..

Of coarse this was with SB600 The Volts will be about the Same with 9950/SB750 for CPUNB..The CPU is main factor for NBvolts..Now a 750chipset( CPUnb to SBchipset) will be a little lower because the SB750 does a better job.

Hope that made sense..
Your Cooling will determin the overall Oc.
I just Try to find Max CPU clock @2200nb before raising the CPUNBvolts.. More CPUnbvolts will allow the CPU to Clock higher...Raise the CPUnb and Scale the Volts in Slow increments to find its max. Then Turn the NB back down to say 2200mhz with the Higher Volt setting.

Next try rasing the CPU clock Higher while keeping the CPUnb @2200mhz. You probally will be able to hit 3.4ghz no prob. For me to achieve 3.5ghz i have to run CPUNBvid @1.45v+ and above 2200mhz NB or 3.5ghz wont work. Each chip is differant. Ive found the Higher the Phenom goes the Nb seems best when raised a little above stock ,,Goes in hand with the extra CPU clocks//CPU performance.

THanks bro, this post was really helpful. However my CPU is water cooled, everything else is on stock cooling. I have my computer out of a case in the open so temps stay nice and cool. I will give it another shot and let you guys know. Thanks.

[Chicken Patty]

What is the max acc should be run at? Would it damage anything to turn it up more? I haven't tried at over +4.

[equinox1]

What is the max acc should be run at? Would it damage anything to turn it up more? I haven't tried at over +4.

not sure, im comfortable running it at +4. seen no ill effects from it. +6 allows me to run my nb at 2600. +4 and nb at 2600 crashes,i need to probably up nb core voltage to get 2600. will have to read up on it. actually gotvoltage was at 2600. ill check his posts for specs

[Chicken Patty]

not sure, im comfortable running it at +4. seen no ill effects from it. +6 allows me to run my nb at 2600. +4 and nb at 2600 crashes,i need to probably up nb core voltage to get 2600. will have to read up on it. actually gotvoltage was at 2600. ill check his posts for specs

Thanks.

I also read that it depends a lot on the stepping. Like some chips need ACC at a high "+" setting to run stable while some can actually use a "-" setting to run stable. I'll do some more research and some more testing. Hopefully soon I'll have new benches up, along with the Cine benches I have to do. For some reason Cine bench crashes while nothing else does. So hopefully I can get it working correctly soon.

[Chicken Patty]

just for kicks, here is a screenie of the temps i'm getting now that the thermal compound is more settled in. CPU is water cooled with a Koolance dual fan radiator and thermal take pump & reservoir. THe rad has 2 120mm fans pushing thru it.

My computer is also outside of a case, as you see in my avatar so that helps with everything staying much cooler, room temps is also pretty cool.

[demonkevy666]

just for kicks, here is a screenie of the temps i'm getting now that the thermal compound is more settled in. CPU is water cooled with a Koolance dual fan radiator and thermal take pump & reservoir. THe rad has 2 120mm fans pushing thru it.

My computer is also outside of a case, as you see in my avatar so that helps with everything staying much cooler, room temps is also pretty cool.

wow someone using a koolance radiator, temps seem pretty good too.

[Chicken Patty]

wow someone using a koolance radiator, temps seem pretty good too.

why are you surprised that I am using a Koolance Radiator?

Thanks by the way

[Chicken Patty]

Ok, I just ran super PI, 3dmark (cpu tests only), and CineBench at default clocks.

Use CPU-z to see CPU clocks and HT speed, mem test for timings and NB speed in the top right hand corner

Super Pi


3dMark CPU Score

[Chicken Patty]

Now I upped the NB Multiplier from x10 to x11, NB is now at 2200 MHz.

I forgot to run CineBench with the NB at default. So I ran it at x11 and then from now on we just compare with the rest.


Super Pi


3dMark 06 (cpu score)


Cine Bench



What do you guys think so far, I have to head to bed now its about to be 1:30am here, tomorrow i'll do more testing and comparisons.

[RhoXeD]

try raising ht link also

going from 2800CPU and 2000 HT/NB
to 2800CPU and 2400HT/NB gave me up to 20% gains in some benches.

[HondaGuy]

Phenom 9850 CPU@3.3 NB@2600 HT@2600 Cinebench...

[Chicken Patty]

try raising ht link also

going from 2800CPU and 2000 HT/NB
to 2800CPU and 2400HT/NB gave me up to 20% gains in some benches.

I will as well, once I try only the NB, then I will raise the bus and lower them multiplier to yield a higher HT.

[Chicken Patty]

here is some more benches to follow the ones a few posts ago, this time the NB at 2400MHz

super Pi


3dmark (cpu score)


Cinebench

[Chicken Patty]

ok some info I have gathered. So far by only upping the NB from stock 2.0 GHz to 2.4 GHz we saw almost 1/2 sec. drop in super PI, about a 27 point increase in 3dmark 06 cpu score, which when running the whole test would actually give you a bigger difference with the CPU feeding more to the video card (s).

In Cinebench, I didn't run it at a 2.0 GHz NB speed, however from a 2.2 GHz to a 2.4 GHz NB speed it increased 2291 points in the multiple CPU test, and 510 in the single CPU test. Last but not least, 52 points in the open GL benchmark.

[Chicken Patty]

Ok, now the NB speed back to default (2.0 GHz), but upped the multi from x13 to x14. Result is, CPU at 2.8 GHz. All voltages at default, actually CPU is under default as it is @ 1.296v, out the box it runs at 1.316v.

I owe you guys the cinebench one, I'll leave it running tonight, and tomorrow morning before heading off to work, i'll post it up, Just don't want to wait for it

super pi


3dmark (cpu score)

[Chicken Patty]

Here is the CineBench at 2.8 GHz and 2.0 GHz NB

[merkk1]

Hi guy been working on a ACC setting, my 9850 has a weak core it number 4 . I have to bump it up +10% to make core 4 run stable running over 3.0 ghz the trouble is after i run the pc for a bit trun it off will not like to reboot when clock over 3.ghz at 3.0 and lower no trouble . With the +10%
on core 4 clock over 3.0ghz the cpu run prime np the AOD stabiliy

[merkk1]

dam hit the botton to soon hear some screen shot running aod stability as i post this got any ideas on reboot trouble ?

[Chicken Patty]

Hi guy been working on a ACC setting, my 9850 has a weak core it number 4 . I have to bump it up +10% to make core 4 run stable running over 3.0 ghz the trouble is after i run the pc for a bit trun it off will not like to reboot when clock over 3.ghz at 3.0 and lower no trouble . With the +10%
on core 4 clock over 3.0ghz the cpu run prime np the AOD stabiliy

dude, I dont know what to tell you. Thats weird. You sure when you bring the clock down it does not do it?

[JumpingJack]

here is some more benches to follow the ones a few posts ago, this time the NB at 2400MHz

Cinebench

Were you messin' around like opening windows or running something in the background while the single threaded bench was running, the single threaded score looks really low here. The multithreaded score is spot on, I get roughly the same.

but my single CPU score is 2928 .. (64-bit CB R10)...

Jack

[Chicken Patty]

Were you messin' around like opening windows or running something in the background while the single threaded bench was running, the single threaded score looks really low here. The multithreaded score is spot on, I get roughly the same.

but my single CPU score is 2928 .. (64-bit CB R10)...

Jack

not that I remember. Anyhow, at what clock do you get those scores at? Remember i am at default clocks on that one.

[merkk1]

when i have the pc clock at 3ghz all the cpu cores set at +4% and lower it reboot np but to get to 3.0+ i have to bump the ACC on core 4 up to +10% to make it run stable and it will run find the hole time but it just when i trun it off and try to restart it will not reboot it weird like you said Chicken patty