X2 550 Unlocking & Overclocking Consolidated

0925CPMW + Asrock M3A785GMH/128M(SB710) BIOS 1.20 - SUCCESS
Vcore 1.385V
NB Voltage 1.150V
ACC All cores + 4%
At first the processor had no desire to unlock. I had to overclock it as a dual core first. After a couple of hours grinding Prime 95 at 3.8 GHz dual core I gave it a second try. Had to bump All cores to +4%. Using Vcore 1.365V resulted in an immediate error in the 4th core when I started Prime95 Small FFT. A small boost to 1.375V fixed it. Still not 100% stable - AOE III Asian Dynasties kept kicking me out after 15-20minutes. Changed settings to ACC per core: Core0 +2%, Core1 +2%, Core2 +4% and Core3 +6% - rock solid.
Now I've got to see what it is capable of in 4core mode.

Memory: Adata 4GB DDR3-1600 CL9
Air Cooling: Xigmatek S1283 (waiting for a fan controller for Corsair Hydro H50+2 Scythe Ultra Kaze 3000rpm 133CFM 45.9dBa push/pull)
Computer case: CM HAF932
PSU: BFG 550W
Video: Powercolor HD4830 512MB GDDR3

http://valid.canardpc.com/cache/banner/838251.png

http://valid.canardpc.com/cache/banner/838251.png

@darkblade74,

Try putting ACC in auto, then up your Vcore to 1.4v and CPU/NB at 1.35v. leave bus speed at 200 and HT link at 2000(x10).

ACC Auto is a no go for my system.:(

Quote:

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Originally Posted by darkblade74

ACC Auto is a no go for my system.:(

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Today i saw a new BIOS for my A780GMH/128M, v1.40 which has the remark "Modify code for ACC function". I haven't had time to try it yet, but if there is a relevant updated BIOS for your board, maybe you should give it a shot.

Here's one thing I'm wondering about.
I am getting another 550 that I know for sure unlocks on a MA790XT...... will I have any issues on a Crosshair III?

Was also able to experiment with individual core multipliers with AMD Overdrive and found I could get core 0 and 1 to 3.4Ghz stable while keeping core 2 and 3 at 3.3Ghz.

NB won't go any higher than stock even at 1.25V. Any suggestions?

Well, I guess I have to change my post from SUCCESS to FAIL. My X2 550 BE simply does not want to rise and shine as a quad core anymore:( . As soon as I save my settings and exit BIOS, I get no POST and I have to clear the CMOS no matter what ACC settings (besides DISABLED) I use - Auto, All Cores, Per core, neither changing Vcore nor NB voltage. At least some confort I get from the fact that it's not a bad OCing chip. Flashing with 1.30 BIOS didn't help as well.

Also I get into some kind of FSB wall after 225MHz. 230MHz FSB result in no POST. Memory has plenty of room to go up, NB is within specs, so my guess is it's either the CPU or the MB.

Click the banner:

http://valid.canardpc.com/cache/banner/853351.png

Hi All
Need help. Had to change Mobo back to MSI 770T-C45, Gigabyte 770 board froze after updating Bios to allow "Hybrid" setting and on restart would not unlock all cores. My problem now is that having unlocked all cores on the MSI
I ran Wprime and after 5 passes core 2 (3rd) failed. How can I disable this core
on this Mobo? The settings on the ACC go from 0 to +12 and -12. If I set to per core how do I disable. In anticipation.

OldBarzo
(Douglas)

Quote:

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Originally Posted by OldBarzo

Hi All
Need help. Had to change Mobo back to MSI 770T-C45, Gigabyte 770 board froze after updating Bios to allow "Hybrid" setting and on restart would not unlock all cores. My problem now is that having unlocked all cores on the MSI
I ran Wprime and after 5 passes core 2 (3rd) failed. How can I disable this core
on this Mobo? The settings on the ACC go from 0 to +12 and -12. If I set to per core how do I disable. In anticipation.

OldBarzo
(Douglas)

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I don't remember what board/bios was used but on another forum user claimed... *you must* first clear the cmos, then set it to "per core" and set the core you want disabled to 0, save bios/reboot as usual.

Another way is set numcores switch in boot.ini or using msconfig in Windows, but you can't tell it which cores to use, only limit the number of cores.

1st post in AMD section since venice 3200+ WR days :D

X2 550 BE
CACYC 0928CPMW + Asus evo 785G - FAIL and 3 core FAIL as well. Tried many settings with the latest bios and it restarts/blue screen every time right after starting OS

Despite that I still love everything about AMD much better than Intel :)

cacyc ac 0928cpmw + ASUS M4A770TD PRO, x3 ok @ 3.8, x4 just starts loading OS and BSOD.

Mine CACYC AC 0944BPMW - unlocks but core 3 unstable. Turned off core-3, now running as X3 at 3.6

Board: Gigabyte 790X-UD4P
Bios: F9
VCore: 1.475
VNB: 1.225
NB: 2400
HT Link: 2400
Memory: 800

Not bad - I am happy for the $70 I paid for it at Fry's after $10 rebate on the board :up:

cacyc ac 0932fpmw
ok so heres goes for me.
so far my x2 is a fail but i know of someone with the same stepping which was successful,

i have a dfi DK 790FXB-M2RSH and i have tried almost everyone revised bios i can. (beta and official) iv read and been told that these boards are a :banana::banana::banana::banana::banana: to deal with sometimes and im not surprised since iv had to rma it.

anyway acc on this is very simple.
you just turn it on and select auto, manual all or set per core. (wording isnt correct but u get it)
no mater what i select, after it wont post until i clear cmos.
someone please let me know if they have had major issues and what they did. hoping someone has had issues with this mobo :)
is there a program that can reawaken the cores in windows or anything like that.

hopefully someone can get me in the riht direction so i can awake my sleeping quad :)

thanks

-will

i am getting a Phenom II 550 and i was wondering if there was a AM3 motherboard that i could get that would give me the highest chance of success of unlocking all the cores (stable)

(newegg purchase)

cacyc ac 0940fpmw
unlocked to quad and o/c to 3.825Ghz
gigabyte ma785gm-us2h (F5 bios)
hybrid / acc auto / 200x19 / vCore: 1.475

small fft stable. :)

http://valid.canardpc.com/show_oc.php?id=881201

I have unlocked my 550 to X3...unfortunately it wasn't able to boot @X4

http://www.pctunerup.com/up/results/...reenunlock.JPG

http://www.pctunerup.com/up/results/...Wprime3848.jpg

09115FPMW - sniperspa - Gigabyte MA790FXT UD5P - F8C - Tri core success

Cooled by AC Freezer 64pro

I have also unlocked my Phenom II 550BE, but only to Triple-core.
My third core is unstable whatever I do.

The Motherboard is a Asrock A770DE+ with the bios version 1.4.
In that version AsRock added the CPU Active Core Control option which I used to disable the defective core.

The Procesor is a 0925APMW.

I use the Box cooler for cooling, and I am going to buy a Scythe Katana 3 or AC Freezer 64 pro and than overclock the CPU a bit
(say like 3,6 GHz FSB 240)...

Here are the proofs of my sucess:
http://valid.canardpc.com/show_oc.php?id=879720

http://valid.canardpc.com/cache/banner/879720.png

My thanks to Valg, who gave me the idea for such an unlocking.

congratulations m8, and say hi to Valg :)

so i cant seems to post no matter what i do with my dual core,
can someone answer this for me.. how would i just turn on 1 more core instead of 2, is it just 0% in aac?
and how would i distinguish which cores exactly are my good ones so i can figure out which 2 exactly are my bad ones.

hoping thats not confusing but u know, right now in a 2 core state it just comes up as core 0 and core 1
now is it actually core 0 and core 1 or did it just call it that?

anyone get what i mean?

my 550 is in the truck being delivered this morning. Will post up my results using the GA-790XTA-UD4.

edit: just received them. batch is CACYC AC 0932FPMW

anyone know the vCore / vNB / v/SB max for these cpu's? (ycgtfm -- me lazy right now.) :)

Quote:

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Originally Posted by ReverendMaynard

my 550 is in the truck being delivered this morning. Will post up my results using the GA-790XTA-UD4.

edit: just received them. batch is CACYC AC 0932FPMW

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let me know how it goes since i had the same batch

Got one at Fry's a few weeks ago, mobo/cpu combo deal for $70 after $10 MIR.

CACYC AC 0926MPMW

Don't have a board to test yet, still deciding on DDR2 or DDR3 since I have a few DDR2 kits not in use right now. Will probably go AM2+ to keep cost down. Hopefully by next month I'll have it up and running.

0932FPMW - ReverendMaynard - GA-MA790XTA-UD4P - F1 - SUCCESS

http://www.xtremesystems.org/forums/...d.php?t=241234

Quote:

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Originally Posted by cozmosland

let me know how it goes since i had the same batch

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There ya go!

I ordered two C3 stepping 550's as soon as I could pre-order them and they shipped yesterday. Supposed to come Monday.

I'm really interested to see how they do.