X2 550 Unlocking & Overclocking Consolidated

[ASharp]

MSI 770-C45:

http://valid.canardpc.com/show_oc.php?id=629860

Where can i see which stepping my CPU has?

Looks like a decent chip you got there!

If by stepping you mean batch number, you can find it on the IHS of the CPU. Below where it says AMD Phenom II, there are three lines. The first line is your model number, second line is batch number and the last line is the serial number. What I imagine you're looking for are the last 8 characters on the second line.

[Snowman89]

try with stock HT/NB @ 2000 and kepp CPUvore stock and use NBvid @1.2v...


This should get you stable to boot ,, you may even have a ram problem or videocard driver problem if its crashing right in the Windows XP/Vista screen...


If its a Blue BSOD see what the BSOD says and go from there. IF its driver related try in safe mode and reinstall what ever driver was creating the problem.

If using 1066 divider try the 800... Sometimes a Bios can set wrong timing in 1066mode vs 800 and you can raise the HTT if you need more than 800 on the ram.

Make shure your using the Best Bios. Ive seen some be real buggy on the XT. The F4 i think was best ,im not 100% shure though.

It just locks up when vista should start booting. Whats stock nbvid? Im using the 1600 divider

Does the same thing with 800divider, when it is finished loading vista and the vista mark should appear then it just locks up.... Where can i find the F4A bios then?

[DerBöseWolf]

Looks like a decent chip you got there!

If by stepping you mean batch number, you can find it on the IHS of the CPU. Below where it says AMD Phenom II, there are three lines. The first line is your model number, second line is batch number and the last line is the serial number. What I imagine you're looking for are the last 8 characters on the second line.

Ah ok thanks, i thought perhaps there is a program oder somethink like that... now i have to remove the cooler

Yeah, an other friend already said it that my cpu seems to be cool.

[gOtVoltage]

It just locks up when vista should start booting. Whats stock nbvid? Im using the 1600 divider

Does the same thing with 800divider, when it is finished loading vista and the vista mark should appear then it just locks up.... Where can i find the F4A bios then?

Im bad try it with 1333 divider . You may may not be doing what its suppose to be doing.

As for NBVID its in your Bios you will need to add +.100 to the NBvid setting this will make it 1.2volts.

As for HT and NB freqency its suppose to be 2000 not 1600...I always test with deafault settings and then ADD to The NBvid if the ram or CPU is buggy.

Goto gigabyte site and download the F4A .

[Snowman89]

Im bad try it with 1333 divider . You may may not be doing what its suppose to be doing.

As for NBVID its in your Bios you will need to add +.100 to the NBvid setting this will make it 1.2volts.

As for HT and NB freqency its suppose to be 2000 not 1600...I always test with deafault settings and then ADD to The NBvid if the ram or CPU is buggy.

Goto gigabyte site and download the F4A .

Okey, will report back in a sec after ive tested that.

Where can i find the bios? I must be both stupid and blind but i cant find it http://www.gigabyte.com.tw/Support/M...ProductID=3010

Tried the F4 Bios but no luck ther either with 1333 divider Going for F4I now

Tried the F4G with no luck, reinstalled XP and now it locks up at the welcome screen... When i run prime/linpack at 3.8ghz it runs like a breeze but programs around it starts to shut down... My UD4 was , this cpu/mobo doesnt seem to be much better...

[Snowman89]

What is the stock vcore on the 550?

[Rezag1000]

What is the stock vcore on the 550?

1.35v

[T1Cybernetic]

1.35v

Cheers, I was just looking for that Luckily mine runs at 1.35v as standard but i wanted to make 100% sure i wasn't over/under

[gOtVoltage]

Cheers, I was just looking for that Luckily mine runs at 1.35v as standard but i wanted to make 100% sure i wasn't over/under

yup,,

Also in X4mode and X2mode this is simalar.

NBvid is 1.1volts too...they run better stock @ 1.2v NBvid up to 3600+ with Default Vcore

May take hair more Vcore in X4 vs X2 over default the Vcore.

All depends on your cooling .

[Smartidiot89]

My Phenom II x2 550BE ran at 1.28v stock, and clocked to 3690mhz... Always thaught it was 1.28v doesn't anyone have a link to prove me wrong cause I am really confused now that you say 1.35v

[gOtVoltage]

My Phenom II x2 550BE ran at 1.28v stock, and clocked to 3690mhz... Always thaught it was 1.28v doesn't anyone have a link to prove me wrong cause I am really confused now that you say 1.35v

From what ive seen depends on Bios and What Mobo. Average is 1.35v some will set 1.3v or 1.28v like yours even due to Bios.


Heres Mine @ 1.35v default unlocked X4.

F5A and F5 set same defaults on UD4P DDR2

[-pWs-]

Here is mine unlocked x2 550 B.E.

3803MHz Prime95 stable 2 hours (Small FTT)


4100MHz SPI 1M stable

[davidw8818]

Couple things:

1) ACC may not help much with locked CPUs, ACC will help to extend CPU core frequency clocking. If the limitation is something else (lets say Memory, HT ref. clock, Power) then the benefit of ACC is not optimal

2) typically you want to use AUTO setting if running with 9850/9950 and aircooling, more extreme conditions may like +4% or +6% - 9600BE usually prefers +4 or +6% at increased Voltage levels

3) negative values might be beneficial if trying to tune the CPU to run with low voltage settings (silent HTPC but still with max clocks) - low voltage meaning less than default Vcore

4) IGP in the Chipset doesnt have an impact on the Overclocking capabilities of the mobo (HT ref. clock etc)

5) CPU Voltage slider (CPU VID) range is defined by the CPU: unlocked Phenom CPU (Black Edition) will allow up to 1.55V, locked CPU (non-BE) has a limited VID range (e.g. up to 1.25V) - the motherboard may have VID override or OFFSET capability that allows running beyond max VID value. This may or may not be adjustable via AOD depending on the Motherboard and the implementation. Its a good idea to monitor the Voltage levels when adjusting Voltage / OFFSET value from SBIOS.

6) ACC being unavailable with SB750 could be SBIOS issue or SW bug in AOD. We have certain cases where AOD cant detect ACC capability properly (even if SBIOS is 100% fine). Some of these problems are now fixed with 2.1.3 release and the remaining ones (AHCI/RAID mode in particular) are taken care of with 2.1.4 that will be available soon. Just to make it clear: ACC will not be visible in AOD if you run in AHCI / RAID mode with version 2.1.2 or 2.1.3. 2.1.4 will fix this.

Please update to AOD 2.1.3 - LINK

This solves a couple of bugs that depend on OS environment (the crash bug for instance).

If ACC is not available thru AOD then you could use the SBIOS ACC control for time time being.

BY: macci

Heres ACC -2% at 3.7ghz it needs 1.456v which is +100 in bios to be able to prime 10hrs.

Heres are the results after changing ACC in bois to -4% which it brought down the vcore from +100 to +50.

[Seth-01]

Couple things:

1) ACC may not help much with locked CPUs, ACC will help to extend CPU core frequency clocking. If the limitation is something else (lets say Memory, HT ref. clock, Power) then the benefit of ACC is not optimal

2) typically you want to use AUTO setting if running with 9850/9950 and aircooling, more extreme conditions may like +4% or +6% - 9600BE usually prefers +4 or +6% at increased Voltage levels

3) negative values might be beneficial if trying to tune the CPU to run with low voltage settings (silent HTPC but still with max clocks) - low voltage meaning less than default Vcore

4) IGP in the Chipset doesnt have an impact on the Overclocking capabilities of the mobo (HT ref. clock etc)

5) CPU Voltage slider (CPU VID) range is defined by the CPU: unlocked Phenom CPU (Black Edition) will allow up to 1.55V, locked CPU (non-BE) has a limited VID range (e.g. up to 1.25V) - the motherboard may have VID override or OFFSET capability that allows running beyond max VID value. This may or may not be adjustable via AOD depending on the Motherboard and the implementation. Its a good idea to monitor the Voltage levels when adjusting Voltage / OFFSET value from SBIOS.

6) ACC being unavailable with SB750 could be SBIOS issue or SW bug in AOD. We have certain cases where AOD cant detect ACC capability properly (even if SBIOS is 100% fine). Some of these problems are now fixed with 2.1.3 release and the remaining ones (AHCI/RAID mode in particular) are taken care of with 2.1.4 that will be available soon. Just to make it clear: ACC will not be visible in AOD if you run in AHCI / RAID mode with version 2.1.2 or 2.1.3. 2.1.4 will fix this.

Please update to AOD 2.1.3 - LINK

This solves a couple of bugs that depend on OS environment (the crash bug for instance).

If ACC is not available thru AOD then you could use the SBIOS ACC control for time time being.

BY: macci

Heres ACC -2% at 3.7ghz it needs 1.456v which is +100 in bios to be able to prime 10hrs.

Heres are the results after changing ACC in bois to -4% which it brought down the vcore from +100 to +50.

thanks a lot for all this informations. But i need informations about this values :

- cpu/NB voltage
- NB voltage

how can this help overclocking and in which cases ???

edit : with ACC set to -4 in bios, my computer doesn't post.

[richierich]

Couple things:
Heres ACC -2% at 3.7ghz it needs 1.456v which is +100 in bios to be able to prime 10hrs.

Heres are the results after changing ACC in bois to -4% which it brought down the vcore from +100 to +50.

Wow awesome info. Thanks david!

David, have you tried overclocking your NB and seeing if it's prime stable as well?

[davidw8818]

Wow awesome info. Thanks david!

David, have you tried overclocking your NB and seeing if it's prime stable as well?

I can run NB up to 2400mhz on +100v cpu nb (which is wat ppl claims that it will stabilize the IMC when your running 3.5.-3.7ghz) anything higher will need to bump it up to +200 like 2600mhz

oh and yes is stable with the configurations i had above. I will post pictures later. Gonna play with ACC a little more.

[Snowman89]

I guess you can count my attempt as a fail.

Stepping -0924DPMW
Username -Snowman89
Mobo model -Gigabyte 790XT-UD4P
Bios used - F4/G/I
Success/Fail - FAIL

[-pWs-]

@davidw8818
All cores to -4%??

[davidw8818]

@davidw8818
All cores to -4%??

Yes, all cores -4%

[davidw8818]

thanks a lot for all this informations. But i need informations about this values :

- cpu/NB voltage
- NB voltage

how can this help overclocking and in which cases ???

edit : with ACC set to -4 in bios, my computer doesn't post.

I guess you have to play with ACC a little more. Every chip is different, so you have to find the right spot for it.

[Seth-01]

I guess you have to play with ACC a little more. Every chip is different, so you have to find the right spot for it.

There is no way to finish an OCCT without à BSOD 0x...124. I tried ACC set to -2, -4, +2, +4. VCore is set to 1.47v, CPU/NB Vid is 1.30v, NB Vid is 1.35v. The overclocking is 3755 MHz but no stable OCCT.

Is there anyway that can help me to run this overclocking stable ?

[Dopamin3]

My Phenom II x2 550BE ran at 1.28v stock, and clocked to 3690mhz... Always thaught it was 1.28v doesn't anyone have a link to prove me wrong cause I am really confused now that you say 1.35v

My x2 550 has stock VID of 1.325v. I think it really depends on the chip and/or bios version.

[Rezag1000]

could anyone post the temps that they are getting with their dual core 550 and what HSF they are using? I am trying to decide whether or not I should invest in a new HSF. With two cores running at 3.4 ghz and 1.35V, my thermaltake silent boost keeps my dual core 550 at 50C MAX when running intel burn test. I dont think this HSF will give me any head room to overclock once my 550 is unlocked.

[Dopamin3]

could anyone post the temps that they are getting with their dual core 550 and what HSF they are using? I am trying to decide whether or not I should invest in a new HSF. With two cores running at 3.4 ghz and 1.35V, my thermaltake silent boost keeps my dual core 550 at 50C MAX when running intel burn test. I dont think this HSF will give me any head room to overclock once my 550 is unlocked.

On a mugen 2 (applied with ocz freeze) with stock fan, I run my x2 550 at 4ghz with 1.505v and the under load it goes up to about 48 degrees. When I unlock it and run about 1.4v it is close to the same temperature.

On an unrelated note, does anyone notice these cpus have a weak IMC, or did I just get an unlucky one? It won't run 1600mhz no matter what I try, even as dual or quad.

[richierich]

1600MHz? or 2600MHz? What memory timings?