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Advanced Clock Calibration with AMD 965BE

Muel

Muel

Muel

Soldato
Joined
26 Jun 2009
Posts
3,023
Location
Sheffield
Hey, I just found this article: http://www.nordichardware.com/news,7982.html

I'd never heard of ACC before, apparantly with it enabled with the correct settings it allows you to run a higher overclock, because (if I am understanding this correctly).

What I want to know is has anyone used this before, and how well does it work? I'm using an Asus M4A79XDT Evo motherboard and my processor is an AMD Phenom II 965 BE C2 140W, currently at 3.8ghz, and I'm hoping this will allow me to reach 4ghz.

So has anyone used it before, and what did you find? How well does it work? can you really get an extra 100-300mhz with it enabled? What are the recommended settings for it with this chip?

Any help at all greatly appreciated!
 
the Phenom II's have they own hardware ACC builtin to the chip.

enabling ACC won't do anything with Phenom II cpus also it could make your current overclock unstable.
 
Yeh it appeared to do nothing when I tried it, oh well never mind.

I won't be trying to overclock it further again, I've got it fully stable now at 3.8ghz @1.5125v, so that's where it's going to stay.
 
2 hour Prime 95 earlier today (I don't see the point in going for longer, I will never end up maxing all 4 cores at one time anyway, even for 5 minutes), got to 48C then it started going down and ended on 46C. The room temp was dropping though. I'm using a Fenrir Titan with the fan set to "Silent" with QFan. When it was warm in here I saw 50C once though.

My full spec in TurboV is:

CPU Frequency: 200mhz
CPU Voltage: 1.5125v
DRAM Volt: 1.64V (RAM set stock, recommended volt is 1.65v at 1600mhz).
CPU/NB Voltage: 1.1375V
VDDA Volt: 2.8V
HT Volt: 1.20V
NB Volt: 1.10V
SB Volt: 1.35V

The last three are set to auto though, I'm not really happy because the NB volt is as low as it can go, and the SB volt is as high as it can go. I know it's on auto but it just doesn't seem right to me. :/

HT Link is set to 2000mhz, I can't remember why though, I was advised to when I started overclocking it somewhere, but I can't remember the reason.

All the RAM timings and settings are all set to auto, the only thing I've changed there is I set the frequency to 1600mhz and the voltage to 1.64v. Before I did that it was on auto, but was running at 1.8V! Just goes to show auto isn't always right. :P

EDIT: All set in the BIOS by the way, not in TurboV, I was just using it to get the values. :P
 
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Muel said:
CPU Frequency: 200mhz
CPU Voltage: 1.5125v
DRAM Volt: 1.64V (RAM set stock, recommended volt is 1.65v at 1600mhz).
CPU/NB Voltage: 1.1375V
VDDA Volt: 2.8V
HT Volt: 1.20V
NB Volt: 1.10V
SB Volt: 1.35V

The last three are set to auto though, I'm not really happy because the NB volt is as low as it can go, and the SB volt is as high as it can go. I know it's on auto but it just doesn't seem right to me. :/

HT Link is set to 2000mhz, I can't remember why though, I was advised to when I started overclocking it somewhere, but I can't remember the reason.
Click to expand...
your HT, NB, SB are right for stock voltages,

HT link is 2000mhz for stock, no problem upping it.

u could up the NB frequency but u may need to up the cpu-nb voltage alittle
 
Muel said:
2 hour Prime 95 earlier today (I don't see the point in going for longer, I will never end up maxing all 4 cores at one time anyway, even for 5 minutes), got to 48C then it started going down and ended on 46C. The room temp was dropping though. I'm using a Fenrir Titan with the fan set to "Silent" with QFan. When it was warm in here I saw 50C once though.
Click to expand...
its not about maxing out. its about not having random errors / crashs. even when your not doing anything it can/could still crash or error.
 
Haven't really thought about pushing that yet, but I think I will just to see where to go. If I'm right, it's the bus used for transferring data between things on the motherboard? So if I were to push it higher, (I'm sure I've read about it reaching 2600mhz), would I feel much difference?

I'm love to see SuperPI 1M done in less than 18.5 secs. (I have had it done in 17.8, but I have to close all my antivirus and firewall stuff, which is cheating if you ask me. :P)
 
gareth170 said:
its not about maxing out. its about not having random errors / crashs. even when your not doing anything it can/could still crash or error.
Click to expand...

How can you really test it then? I've had it at 3.8ghz @ 1.500v for 2 months and it's never failed, but when I was checking it today it lasted about 15 mins and crashed, so I upped it to 1.5125V and it lasted 2 hours. (I was also experimenting with ACC). I stopped it at 2 hours, it didnt crash.
 
Muel said:
How can you really test it then? I've had it at 3.8ghz @ 1.500v for 2 months and it's never failed, but when I was checking it today it lasted about 15 mins and crashed, so I upped it to 1.5125V and it lasted 2 hours. (I was also experimenting with ACC). I stopped it at 2 hours, it didnt crash.
Click to expand...
thats because its not fully stable..

use prime95 on blend setting for 6-8 hour or use IBT on maximum for 15-20 runs or linX for 15-20 runs, all...
 
Well to be honest I don't agree, all that will prove is that it is capable of running at full load for 6-8 hours instead of 2 hours, which it will never be required to do anyway.

I may try the LinX one though, cheers. Not keen on IBT at all, seems to be aimed at pushing temps higher than they usually go, and I don't actually care what the temps are as long as they're below about 55C.
 
Muel said:
Well to be honest I don't agree, all that will prove is that it is capable of running at full load for 6-8 hours instead of 2 hours, which it will never be required to do anyway.

I may try the LinX one though, cheers. Not keen on IBT at all, seems to be aimed at pushing temps higher than they usually go, and I don't actually care what the temps are as long as they're below about 55C.
Click to expand...

Don't disagree with people, you must be IBT stable LOL. :p
 
Turns out 1.5125v wasn't enough to keep it stable, one of the cores stopped working when I was fiddling with it earlier, so I've given up and put it back to stock.

It'll be fine at 3.4ghz for everything I want from it, just seems silly pushing it that hard for every day use. :P
 
Muel said:
Well to be honest I don't agree, all that will prove is that it is capable of running at full load for 6-8 hours instead of 2 hours, which it will never be required to do anyway.

I may try the LinX one though, cheers. Not keen on IBT at all, seems to be aimed at pushing temps higher than they usually go, and I don't actually care what the temps are as long as they're below about 55C.
Click to expand...

It doesn't matter.

Errors can occur when the CPU is or isn't loaded fully. They are more likely to occur at high temps and at high loads but I've had crashes (3700+ AMD64 (forgotten the core name)) and it used to crash randomly at idle using MSN/Firefox... but did 8 hours of prime no problems (actually maybe 24 hours :o)
 
That still doesn't tell me why you should ramp it up to full load and full temp and keep it there for 8 hours+?

If errors can occur at any time, then hammering it like that won't achieve anything surely?
 
Aim for a NB clock of 2600mhz mate along with 3.6ghz if you can get these 2 stable there wil be few things that you pc cant do. The NB clocks give a huge performance boost on these boards Its not about max FSB for best results. hope it helps:)
 
BigBruiserAl said:
Aim for a NB clock of 2600mhz mate along with 3.6ghz if you can get these 2 stable there wil be few things that you pc cant do. The NB clocks give a huge performance boost on these boards Its not about max FSB for best results. hope it helps:)
Click to expand...

Seriously?
I could go back to 3.8GHZ with a stable 2.8GHZ HT and 3GHZ NB. Would I get better performance than my 4GHZ 2.2 HT 2.6GHZ NB?
 
3.8GHZ with 3GHZ NB is better than 4GHZ with 2.6GHZ NB..

upping the HT doesn't do anything to the performance, in fact it could give a performance hit.

higher NB is much better than higher core clock
 
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