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Another Phenom II 955 overclocking thread! CPU-NB-HT

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  • CPUs
  • Overclocking
  • Phenom
Last response: in Overclocking
a b à CPUs
August 4, 2011 2:43:28 PM

AsRock 890GX Pro3
Phenom II x4 955BE C2 [w\ Hyper 212+]
Patriot Sector 5 DDR3 1600 2x2GB
XFX Dual Fan Radeon 6870
3.5TB SATA 3.5"
Antec 300 Illusion
Windows 7 x64 SP1
[idling around 30°C, Prime95 load around 50°)

Currently stable with CPU @ 3.6GHz (1.375v), NB @ 2600MHz (CPU-NB 1.3v), HT @ 2400MHz (on AUTO, @ 1.1v).
Hoping to get stable with CPU 4GHz, NB 2800MHz, HT 2400MHz maybe 2600MHz.
-can't get my 955 completely stable @ even 3.8GHz, tried with voltage up to 4.25.

looking at AXTU (AsRock Extreme Tuner) shows:
CLOCKS
CPU Frequency 200MHz
PCIE Frequency 110MHz
CPU Ratio x18.0
HT Ratio x12
VOLTAGE
CPU Voltage 1.375 V
CPU NB Voltage 1.3 V
NB Voltage 1.145 V
HT Voltage 1.105 [why's this one missing the "V", is it not measured in volts?]

HT @ 2600MHz: what exactly should the voltages for the HT be and what speed & volts should the NB be running at? Usually seeing that the HT should be about 400MHz below the NB, but haven't seen too many with their NB over 2800MHz.

i've been going through all the guides and suggestions for about a year now but never see any definitive answers it seems. i have always been looking for a chart with Speed to Voltage Ratio for all components. i know it varies depending on each individual component and chipset but there should be an average norm right? all guides and forums pretty much come down to: increase in small steps. fine, but i still want to know what i should expect. also, when figuring voltages for this CPU is there an equation you can go by to determine the minimum voltage the CPU and other components need at certain speed increments?

though I've seen it asked a hundred times I've never seen a real answer. if you know: what is the difference between the "CPU NB Voltage" and the "NB Voltage"? i have never changed the NB Voltage, only the CPU-NB Voltage.

P.S. please don't just provide links to other guides UNLESS they are very new and directly answer my questions.
P.P.S. why is this 955 C2 always labeled as a 1.25v CPU when every board I've had it installed in shows it at default 1.35v? i've always manually set it @ 1.25v for stock speeds and it's always been fine. 1.35v runs it with no prob up to 3.5GHz.

More about : phenom 955 overclocking thread cpu

a c 174 à CPUs
a c 311 K Overclocking
August 4, 2011 9:32:55 PM

GObonzo said:
AsRock 890GX Pro3
Phenom II x4 955BE C2 [w\ Hyper 212+]
Patriot Sector 5 DDR3 1600 2x2GB
XFX Dual Fan Radeon 6870
3.5TB SATA 3.5"
Antec 300 Illusion
Windows 7 x64 SP1
[idling around 30°C, Prime95 load around 50°)

Currently stable with CPU @ 3.6GHz (1.375v), NB @ 2600MHz (CPU-NB 1.3v), HT @ 2400MHz (on AUTO, @ 1.1v).
Hoping to get stable with CPU 4GHz, NB 2800MHz, HT 2400MHz maybe 2600MHz.
-can't get my 955 completely stable @ even 3.8GHz, tried with voltage up to 4.25.


That 4GHz are impossible for your CPU revision, maybe 3.8GHz with voltage at 1.55V but not sure. For that CPU revision the NB @ 2800MHz is hard but not impossible, you need add voltage to the CPU-NB voltage options in your BIOS. For the HT, 2000MHz offers the best performance, something above that is useless.
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a b à CPUs
August 5, 2011 12:04:41 PM

saint19 said:
That 4GHz are impossible for your CPU revision, maybe 3.8GHz with voltage at 1.55V but not sure. For that CPU revision the NB @ 2800MHz is hard but not impossible, you need add voltage to the CPU-NB voltage options in your BIOS. For the HT, 2000MHz offers the best performance, something above that is useless.
so, you havent answered any questions and you're info is incorrect. thanks so much.
HT above 2000MHz is useless? Wrong. @ 2200MHz AMD OverDrive benchmark goes from 7500 to 7900. @ 2400MHz score rises from 7900 to 8500. [with 3.6GHz CPU, 2600MHz NB]
I've posted what I had believed to true a few times on forums and been proven incorrect. All of us need to research our opinions more thoroughly before we go telling others how to do things.

Through yesterday I had NB @ 2800MHz with 1.3v and passed all tests. Seeing that was stable I then went back down to 2600MHz and tried 1.26v, stable and temps seem to have dropped a degree or two.
I didn't see any change in scores between 2600MHz and 2800MHz in WEI or OverDrive. Will keep testing back and forth to see if the 200MHz makes a difference in performance.
Finally got CPU stable @ 3.7GHz with 1.4v but going to try lowering voltage through this weekend. Still want to hit 4GHz!!

With the 3.7GHz, 2600MHz NB, and 2400MHz HT scores have gone to 9500+, highest I've gotten yet.

[only using OverDrive for quick benchmarks, all OC done from BIOS]

I need answers for my questions about voltages!!
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a c 174 à CPUs
a c 311 K Overclocking
August 5, 2011 2:45:27 PM

Yeah. Read this: http://www.overclock.net/amd-memory/555061-guide-am3-cp...

Personally I never test a CPU with a program from the same CPU's manufacturer, test it with 3DMark, Maxmem, Vantage...those are real benchmarks.

For answer your questions:

1- CPU-NB Voltage is for the IMC in your CPU while the NB voltage is for the chipset in the mobo
2- About the range voltage, equation doesn't exist really since as you say all depends of components and bach of CPU. Average for your CPU goes from 1.43V to 1.55V for 3.8GHz, you need find yours.
3- Where do you saw that 1.25V? The C2 is 0.875V to 1.5V CPU, keep in mind that if cool'n'quite is enable, the voltage change in CPU-Z and always exist a vdrop.
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a b à CPUs
August 5, 2011 3:45:02 PM

saint19 said:
3- Where do you saw that 1.25V? The C2 is 0.875V to 1.5V CPU, keep in mind that if cool'n'quite is enable, the voltage change in CPU-Z and always exist a vdrop.

was the 955's 125w rating I was thinking of. was looking at the 1.35v and had remembered seeing that 125w in details.

about the graphs on overclock.net:
My timings are at 7-7-7-21-2t-Row Cycle Time 32, with the DDR3 1600 RAM. Does changing the command rate to 1t really improve system much?
I kept thinking about going back to 1333 and try lowering all the timings some more and retesting. This motherboard defaults at 1333 with just about the same timings I have now at 1600.
I tested 1333 defaults versus 1600 recommended 9-9-9-24-2t and the scores in WEI, 3DMark Vantage, and AMD OverDrive were significantly lower at 1333 with CPU at 3.5GHz and NB at 2400Mhz back when I tested.
Do you believe I would really get improvement back at 1333 with much lower timings? [Or is this guy on overclock.net just trying to justify buying a motherboard that only supports up to 1333? lol]

Cool & Quiet and all automatic overclocking crap always disabled, 1st thing I do when loading up motherboards for the first time. Usually just go back after all settings are tight and setup custom K10STAT profiles for CPU control.

I do use 3DMark Vantage and Crysis Benchmark for testing CPU & GPU after I think I have everything stable. They both take too long to load and run when I'm going through settings in the BIOS\UEFI and restarting every 10-15 minutes. OverDrive's just a quick 30sec run and seems to reflect the speeds I'll get in FPS in games pretty well. Anything below 8000 = crap, as it climbs past 8000 so do my FPS.

When should the voltage for NB alone be adjusted? I've only ever changed the CPU-NB.
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a b à CPUs
August 5, 2011 3:59:59 PM

Looking back through that guide on overclock.net and it really doesn't make sense how or why in those graphs lower speed RAM would finish tasks faster. Besides it was produced 3 years ago for older motherboards\chipsets. Think we'd all be better off testing on our own for those speed issues.
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a c 174 à CPUs
a c 311 K Overclocking
August 5, 2011 4:20:36 PM

1- The 1T give you more performance, worked for me in benchmarks but you can try too as compare results.

Does you mobo give you the option to set the RAM at 1600? Give me please the link of the RAM that you have.

I only change the NB voltage on extreme cooling (temps under 0ºC) or for go with NB above 3000MHz, my current one is 3000MHz @ 1.325V
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a b à CPUs
August 5, 2011 6:46:15 PM

saint19 said:
Does you mobo give you the option to set the RAM at 1600? Give me please the link of the RAM that you have.

specs are in first post here. MB does support 1600 RAM in options and runs mine with no problem at all. like I said at 1600MHz timings are at 7-7-7-21-2t.
http://www.patriotmemory.com/products/detailp.jsp?prodl...

saint19 said:
I only change the NB voltage on extreme cooling (temps under 0ºC) or for go with NB above 3000MHz, my current one is 3000MHz @ 1.325V

with your NB is at 1.325v, what's the CPU-NB at?
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a c 174 à CPUs
a c 311 K Overclocking
August 5, 2011 7:17:41 PM

Set 7-7-7-21-1T @ 1.65V if that doesn't work try with 7-7-7-24-1T and same voltage.

NB: 1.15V
CPU-NB: 1.325V for 3000MHz
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