For a $5 difference I'd try picking my own unless getting to you're local fry's is a hassle.
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For a $5 difference I'd try picking my own unless getting to you're local fry's is a hassle.
Its an hour drive to my local Fry's but we will be up that way later this week.
If you're assured you can choose the one you want, I'd take my chances at fry's and wait.
Some success here :D
0921APAW ASRock A790GMH/128M - P1.20
http://valid.canardpc.com/show_oc.php?id=607966
http://i64.photobucket.com/albums/h1...ter/unlock.jpg
Using speedfan the third temp is the cpu. It works on my Bio TA790G :) (also unlocked to 4 cores)Quote:
Originally Posted by lamby_splendid
I went to Fry's (and was allowed to pick the batch and week i wanted) but all they had was:
CACYC AC 0923EPMW
I will test it tonight after work and see if it unlocks in my MA790X-UD4P
I havnt seen one of those yet... Mostly 0922 has been highest in my Area ATm ,,when looking for a few friends.Quote:
Originally Posted by BrokenWall
NOTE; EPmw's seem to have good unlock rate.. keeping finger crossed for ya,, you have the first 0923 on the list.
I know i figured i could take a hit for the good of XS. The CPU makes it yay, if not drop it in my wife's pc and beg her to let me buy another one from newegg.
*edit* I did a google search for "0923EPMW" and "0923 EPMW" and was unable to find anything at all about this CPU.
0923EPMW - Success
x4 @ 3.2Ghz
MA790X-UD4P F5a
Screenie: (1600x1200)
http://brokenwall.net/pics/Computer/phenom/x4-550.jpg
*edit*
I might need to look into why it wont stay stable. I have gave it 1.4v and it will boot into Windows and run basic apps for awhile but any heavy tests like 3Dmark cause it to blue screen. Memory is running at SPD timings for 1066 and 2.0v
You probably need to give it a little more Vcore man.. If you have decent cooling 1.5v should be reasonable...Quote:
Originally Posted by BrokenWall
Gratz on the unlockable chip, I'm sure you can tune it up with a little practice.. :up:
Found the bug. It crashed while in Dual core mode at stock. So i backed my 1066 memory back to 800 and the damn thing is stable and made it though 3D06 with no problems as a quad at 1.35v So i get to play with my worst area. Memory timings.Quote:
Originally Posted by Daveburt714
Same thing happened to me when dropping from 1600 to 1333. Memory timings are such a pain. Congrats on the unlock though. It feels good doesn't it?
yes it feels like im sticking it to da man
Quote:
Originally Posted by BrokenWall
It should do 3.5/3.6 with Stock CPUvcore(or small +). X4mode
On this Mobo you should Run +200 NBvid .. Even when running STOCK NB.. It hleps with ram a lot ..
Even with mine its unstable past 3.6ghz unless i ADD +100-+200 to NBvid with stock Vcore and NB@ 2000- 2600mhz:D
So if its buggy with the ram setting to 1066 i can almost ganrentee its the NBvid.
I had tested with Stock cooling before putting it under water:D. +100nbvid makes abig differance in what it will do with Stock Vcore and Ram.
Yeah I did some testing today. But I haven't had time to really push it. So your saying bump up the NBvid just a bit and try it at 1066? the ram is at stock settings I haven't really tried to push it. I just wanted to make sure all the cores were stable after unlocked.
Yes,, providing your using 1066 ram,, make shure it runs in 1066mhz mode:DQuote:
Originally Posted by BrokenWall
I have seen some chips not run higher than 900mhz on ram because of IMC or not enuff NBvidvolts.
My 550 will push my ram higher using 800divider vs 1066divider .
When im above 3900mhz it dosnt like Ram@1175mhz ram while Ocing with 1066divider but works fine on the 800 divider @ 1175mhz..when im raising the HTT.
just tweak it one step at a time.
Im going to push the CPU and then find what it can do then worry about the memory last.
I got mine 0924FPMW, no idea yet how will work, have to wait to return to my home to test it.
Will try on a M3A79-T deluxe with 0803 bios
From newegg.com
0922APMW - lemonlime - MSI 790FX-GD70 - 1.5b1 - Success
Anyone having issues with the MSI 790FX-GD70 should give the 1.51 beta a try. Check out this thread :up:
http://www.xtremesystems.org/forums/...1&d=1247870515
Hey guys !!! :welcome:
i have the choice between 2 motherboards : Gigabyte GA-MA790GP-UD4H or DFI LANPARTY JR 790GX-M2RS
which is the best for overclocking and unlockung Phenom2 720BE and 550BE ?
i have an Asus M4A78-E but i find this motherboard is very crapy for unlocking cores or overclocking. I cannot unlock my 720BE and the 550BE. The step of the 720BE is 0904DPMW and the 550BE is 0919EPMW. I tried the 0082 bios and the last 1204 without chance.:mad:
(sorry for my poor english) :(
je prendrai la gigabytes sans hésiter, le débloquage des cores a été éprouvé dessus ;)
Par contre le 550be pas sur qu'il soit délockable , sur ce stepping ya eu des échecs, j'en ai eu un aussi .
merci pour les infos !Quote:
Originally Posted by zelos
thanks for the informations :D
Allow me translate that into Australian so the rest of us can understand.Quote:
Originally Posted by zelos
G'day, Zelos here. Friggin 550 on Gigabyte wont unlock, what a ripoff. Stepping is a failure.
Am I close?
C-BuZz
what about that
Quote:
Originally Posted by FR to ENG
Quote:
Originally Posted by C-BuZz
thanks for the translation guys :)Quote:
Originally Posted by mk-ultra
It would help if you can post your stepping :yepp:
0922CPMW - xixo_12 - Biostar TA790GX3 A2+ - Mod Bios (RH) - Success :up:
Too hot to handle by Stock cooler
http://img174.imageshack.us/img174/1651/91579172.jpg
good translation ! :up:Quote:
Originally Posted by mk-ultra
sorry for the french spoken :hitself:
edit : i made my choice : i'll buy the gigabyte !
at the moment my X2 550BE 0919 EMPW and my X3 720BE 0904 DPMW won't unlock on my ASUS M4A78-E. If I enable the ACC, the motherboard reboot and don't post
Yet to see anyone unlocking on the ASUS M4A78 - so probably BIOS issue?Quote:
Originally Posted by Seth-01
Has anyone had success with the Gigabyte GA-MA78GM-US2H? The Rev 2.0 is supposed to have sb710. But i dont know if the bios is capable.
Here is my overclock, its not stable I didn't even touch the voltages and I was able to boot into Windows with the magical 4Ghz all on air.
http://www.geocities.com/johnvuong2000/amdoverclock.jpg
For some reason I cannot set the multiplier higher than 19. Must be my motherboard I suppose. I tried unlocking the 2 other cores but it doesn't work, it either won't post or I cannot go past the boot screen. But whatever, I don't really care.
Don't see any pics Chrono
sooo it was a failQuote:
Originally Posted by Chrono Detector
what was the mobo & the date?
My 720/550 do the same thing on my M3A79-T with Modded Bios and wont even work with any stock Bios by ASUS.Quote:
Originally Posted by Seth-01
My UD4P Unlocks both flawless with STOCK BIOS F5....
Id say the Mobo has to do alot with what works and what dosnt... Gigabyte has the best success so far .Even there low line UD3 unlocked both of mine too when tested for a friend while he waits for a new 550.
I have a 790Gp-UD4H, and while I still haven't gotten around to doing some solid OC'ing, it's a nice board. =]
I finally went and took off my heatsink the other day to take a look, and guess what I found?
http://i76.photobucket.com/albums/j1...t/SNC00038.jpg
http://i76.photobucket.com/albums/j1...t/SNC00039.jpg
It's a 0920GPMW! :shocked: Boy do I feel lucky. I'm only the second person to have a 0920GPMW to successfully unlock.
sorry for the french parenthese :p:
by the wat C-buzz you didn't correct the mistake about the stepping on the 1st page :)
The screenshot is on my post, you can't see it?Quote:
Originally Posted by richierich
I only wanted to see if I can successfully boot into Windows without touching the voltages and I was surprised to see it did. It was "stable" until I ran IBT, though I knew it was going to fail but I wanted to see how long it would last. I will increase the voltages later.Quote:
Originally Posted by Jamesrt2004
My motherboard is a Gigabyte GA-M720-UD3, some budget board that cost me like $98, and I just overclocked this yesterday.
Well, then i´m the third one here ;)Quote:
Originally Posted by KayDat
0920GPMW - DonBanana - ASRock A780GMH/128M - P 1.20 - Success
http://www.abload.de/thumb/x4mwqn.png
It´s hard to overclock on that board because of the voltage instabilities :down:
i think so ! i will see later, my gigabyte is on the road ! this week i will try to unlock the 720BE and the 550BE.Quote:
Originally Posted by Jessfm
thanks for the informations :up:Quote:
Originally Posted by gOtVoltage
0922APMW - successfully unlocked to 4 cores stable, Biostar 790GX XE
0923APMW - successfully unlocked to 4 cores but only 3 cores stable, Biostar 790GX XE
I wonder how many of those who failed to get 4 cores stable have tried running their chip as a tri-core ie. x3, it's plenty fast still. :up:
My early UVOC attempts, not finalisd results cos yet to fully tweak the NB speeds.
http://i173.photobucket.com/albums/w...NB2000_5xL.png
its kinda funny that since its only a tri core CPU-Z is still picking it up as a Quad.Quote:
Originally Posted by MacClipper
Anyone have any good ideas on getting good CPU Temp readings after unlocking.
To the BIOS, once unlocked it is ID-ed as a quad with a disabled core - x3 when running as reported by CPU-Z. :D
For my 790GX XE mobo, the onboard sensor seems pretty close enough to the onchip sensor,
http://forums.vr-zone.com/overclocki...ml#post6953511
great ! it's the first time i see this ! Phenom2 X2 550 no running as a quad core but like a 3 core :eek:Quote:
Originally Posted by MacClipper
Quote:
Originally Posted by Chrono Detector
Check the Bios version you are using ,, I recomend the Most recent from Gigabyte for UD3 and UD5..Check the Default CPUvcor as it should be 1.35v NOT 1.3v or 1.26v..Disable CnQ too or you may have problems with Default volts when enabling X4cores.
UD4P the F5 is best for unlocking X2 550 ATM.
Make shure to Set the ACC mode to Hybrid and use the Auto ACC function ..Also set to stock Multis when you do this for the first time so it will enable all cores .. The UD3 does unlock them in Hybrid Mode under ACC setting for Firmware(Auto ACC suggested).
Note :
AS for The X2 550 being a 3core that means usually you have a Downcore option enabled or are not using ACC auto with Hybrid and could be using a older outdated Bios.Check to make shure you are using Most recent Bios. You should also make shure the NBvid is set to +100 for fourcores to help the IMC..
This will set the NBvid to 1.2volts instead of default 1.1v which is way to low. When overclocking fourcores @ 3400+ and stock volts on CPUvcore or VID.
Here are some screens all with my Mobos Default of 1.35cpvid(default volts) and NBvid @ 1.2v not 1.1v..this should be set for UD3/ Ud4 /UD5mobos regardless of DDR2/DDR3 as i have tested this for a friends setup as well.
NBvid is 1.1volts i found this to be too low when i went to 3500mhz and only 2200nb
http://i168.photobucket.com/albums/u...4P_F5Abios.jpg
NBvid @ 1.2volts with Stock Vcore or CPUvid
http://i168.photobucket.com/albums/u...ts_3500mhz.jpg
NBvid @ 1.2volts with Stock Vcore or CPUvid
http://i168.photobucket.com/albums/u...ts_3800mhz.jpg
NBvid @ 1.3volts with (CPUvid set to 1.45volts)
http://i168.photobucket.com/albums/u...lt_3900mhz.jpg
I recomend 1.2 NBvid as the lowest to run when in foucore Mode and even as an X2core. I found that @ 1.1nbvid it would be unstable past 3550mhz unless i used 1.2volts on the NBvid..
Note: all runs are with the NB set to 2200mhz @ above CPUvid's in screenshots...It is very consistant volt wise in X4 and X2 mode .
Im using Water,,
Air you may need slightly more CpuVcore and or NBvid for same results...Bump the volts slowly since these Cpu's dont need Xtreme volts ,Unless your going supercooled keep the Volts minamal @ 1.2NBvid for under 2400mhz NB or More for Higher NBmhz. It works the same for UD3/UD4/UD5 ... Its simply what the CPU wants...Default voltages are only good up to 3500mhz on average for X2 550's ATM with Air or Water.
Have fun ,,
gOtVolTage
My 0924FPMW on my Asus M3A79-T deluxe Bios 0803, 0905 FAIL
to unlock 4 cores, but 2 running easily 3.7 ghz on air flawless
Im thinking of getting a 0918BPMW, handpicked from the shop. It seems like a good cpu for unlocking or?
Well I was able to unlock mine. YMMV though! :up:Quote:
Originally Posted by Snowman89
testing a 0922 CPWM with Gigabyte 770T-UD3P yields the result :
cooling is Zerotherm Nirvana
http://img339.imageshack.us/img339/2200/92875891.jpg
Hello AMD boys :D
good news but at first the story of my Phenom 2 X2 550 0919 EPMW :
Motherboard : ASUS M4A78-E DDR2 790GX & SB750
Original bios : 0711 ..... unlocking : failed (black screen and reboot again, again and again .... when ACC is enable) :(
Bios 0082 modded : unlocking failed (when ACC is enabled, it's the same like 0711)
other try with bios from ASUS give me the same results : no boot :shrug:
Bios 1204 : unlocking failed (when ACC is enabled, it's the same thing like 0711)
last try : bios 1210 (the last on line), I put the multiplier on 10, raise the vcore @ 1.50v but decrease the HTLink to 1600 MHz). I enable the "special" "unleashingé mode with ACC and try a boot.
Hmmmmm the PC boot but i have not see the post. Arrived under Vista, a little CTRL + ALT + DEL and i see ........... 4 active cores :shocked:
A big YES !!!! I'm not sure : it's the last bios or the HT Link set to 1600 MHz but there are now 4 active cores. :up:
I try 3200 MHz with 1.50v and it's stable. Maybe i can decrease the vcore but i'am now interresting to overclock my new quad core that cost me 85 €uro!
Sorry for possible mistakes, my english is a little poor
wow!!so high vcore!! carefull as that is the max vcore. 72degree i thinks max temp for x2 550. try to lower 1.4 for daily use as i can get 1.15vcore x2 3100mhz. x4 3400mhz for 1.35vcoreQuote:
Originally Posted by Seth-01
New system M4A79T-E / 0921APBW - Success!
ACC auto / Unleased mode on / Bios: 1604
http://3800z24.info/Phenom/Callisto/550x4-M4A78T-E.jpg
1.50 vcore was just a try.Quote:
Originally Posted by under18
i'm waiting for my gigabyte to overclock from zero my X2 550 BE with all core enabled. :)
I think 3400 MHz is possible with 1.35v but if i want to go higher for example 3600 MHz i need 1.45v at least.
With 2 cores i can overclock 3780 Mhz but with a vcore of 1.50v. Temps are good because not over 50° with my Zalman 9700. See you soon probably this week to give you informations of my overclocking :up:
0924BPMW - Rezag1000 - Gigabyte 790X-UD4P - F5 - success
if someone could pm me on how to post pictures, I will be happy to do so. (A link to a guide or faq would also be sufficient :) )
0925APMW - Cele303 - Asrock A780GMH/128M - P1.10 - Success - Link
ACC - Auto
Acting as 955 default max 3.8, 1.35V with box cooler
http://img193.imageshack.us/img193/2900/0925.th.jpg
OP updated :up:
C-BuZz
C-Buzz you forgot my post:
http://www.xtremesystems.org/forums/...&postcount=312
Quote:
Originally Posted by BrokenWall
Looks like a fail, not success?Quote:
Originally Posted by C-BuZz
C-BuZz
Its an Success as i stated in the post, but to make things easy for the copy and paste here you go.
0923EPMW - BrokenWall - MA790X-UD4P - F5a - Success - http://brokenwall.net/pics/Computer/.../x4-Stress.jpg
Thx :up: Updated.Quote:
Originally Posted by BrokenWall
C-BuZz
C-Buzz
[ AC098BPMW ]
AC098BPMW - jackdno7 - GA MA790XT UD4P - F4 - Success - Link
this stepping doesn't exist.
Should this one [ AC0918BPMW ]
Good chance?
http://ceemic.pri.ee/hardware/550be.JPG
I'll give a try tomorrow on 790FXT-UD5P :)
Looks like Cele303 successfully unlocked their 0925APMW chip. I imagine you shouldn't have too much trouble either.
I'll be getting mine tomorrow. Not sure what stepping I'll get since it's in the mail but I'll be sure to report back with results later. :)
Got it thx Zelous :up:Quote:
Originally Posted by zelos
C-BuZz
you guys think a 955 with the same stepping as the 550's is the same chip except with the 2 cores disabled? i just got a 955, 0919 epmw which there is a ton of 550's with the same stepping...
I'll be really interested to see your results!Quote:
Originally Posted by crazydiamond
They all came from the same batch so you would think the 955 was binned higher for a reason... ;)
I've actually been waiting to see some results from newer high clocked quads. If it outperforms the X2 550's you should have a sweet chip on your hands.
Keep us posted! :up:
ya ill let you know how it does, i ordered up the gd70/955 combo from the egg for $315 and got the ocz gold amd 1600mhz ram... i was askin cause i saw somewhere else someone say that batch for 550's was good and saw someone on here with their 550 with same stepping priming as an x4 at 3.7xx ghz 1.35v thought it was pretty good.. i got a ton of school work to do the next couple days but hopefully sometime next week ill get to do some real tweaking
good :)Quote:
Originally Posted by C-BuZz
but this category already exists on the bottom :p:
Put that one in right order ! move it lower down table :)Quote:
Originally Posted by C-BuZz
[ AC0918BPMW ]
AC0918BPMW- jackdno7 - GA MA790XT UD4P - F4 - Success - Link
Ahh yeah ok IC now :rofl: The AC in front of the stepping made me confused :welcome:
C-BuZz
this thread is a must , thanks C-Buzz.
Now everyone can choose what to take.
Honnestly, in my country the "best" stepping i could find is a 0919EPMW , i don't know what to do :p:
to my mind .... it's a good one ! :up:Quote:
Originally Posted by zelos
Hi Guy's !
my new Gigabyte MA-790GP-UD4H works fine. The last bios F3 was flashed but i have a little trouble : when i increase the CPU/NB Vid to 1.20v instead of standard 1.1v, the motherboard don't increase the vid. AMD Overdrive tool and Everest Ultimate confirm this.
Another question for overclockers : how do you do to overclock an unlocked X2 550BE to 3.7 GHz with 1.35v (the standard vid). My 0919 EPMW is unstable OCCT at 3.55 GHz with a so vid :confused: I'm a new overclocker in AMD's world but my E3110 C0 works fine at 4.25 GHz @ 1.32v :D
http://img140.imageshack.us/img140/7...nlockworks.jpg
Stepping is 0924BPMW. Looks like this stepping and board is a winning combo as Rezag1000 was also able to unlock his. :)
I also tried this chip on my ASUS M3A79-T Deluxe with BIOS 0803. I was able to get the board to recognize it as a quad core and even booted into Windows but it locked up instantly when all four cores were loaded using Prime or IBT. Also didn't work with only three cores active either. Didn't work at all with 0905.
For C-BuZz:
0924BPMW - ASharp - Gigabyte MA790X-UD4P - F5 - Success - Link
When unlock fails, does it fail to post or just failed when stressed?
I just buy 0922 APMW 20pcs all unlock and stabil with 3 board DFI LP DK 790FXB M3H5, ASUS CROSSHAIR III, BIOSTAR 790GX A3+
http://img268.imageshack.us/img268/200/x2550be2.jpg
http://img132.imageshack.us/img132/7383/x2550be.jpg
:shocked::shocked::shocked::shocked::shocked:
what will you do with all this pieces ?:confused:
omfg
Yep i think you need a couple more though if you are going to tile your kitchen floor :P
I love your mosaic of 550s, omg so beautiful!!
0925APMW - Cele303 - Asrock A790GXH/128M - P1.20 - Success - Link
0925APMW - Cele303 - Asrock A790GXH/128M - P1.20 - Fail - Link
ACC - Auto
http://img253.imageshack.us/img253/5...0x40925.th.jpg http://img353.imageshack.us/img353/5662/dsc02983.th.jpg
Ive got a 550 incomming to. But i cant decide on the motherboard. I have a Gigabyte 790X-UD4 atm but im thinking of going am3 with a asus 785G something motherboard. Or what motherboard should i go for to have the best chance to unlock it to a quad?
not the Asus motherboard !:down:Quote:
Originally Posted by Snowman89
Okey, but what am3 board should i get then?Quote:
Originally Posted by Seth-01
Gigabyte !
Gigabyte seems to be the best unlocker so far.
ASUS is ok, and MSI seems to be struggling with releasing a good BIOS.
If you want a cheap as possible board go for the new AM3(DDR3) 770+SB710 motherboards from Gigabyte or MSI.
Lol, still what gigabyte? Ive had alot of problems with my 790x-ud4 and my previous am2+ gigabyte mb to so i dont know if gigabyte really is ready :PQuote:
Originally Posted by Seth-01
Snowman89: FWIW man, The GBT 790XT-UD4P (DDR3 board) unlocked my 720BE and the 550BE, and clocks the snot out of both of them!!
I'm sure you have a bad taste in your mouth conserning GBT...
I actually swore off of them after the DS5 and S2H boards, and I've seen alot of people having the same problems using the UD4's that I had with those earlier boards....
I personally think you'd be really happy with a UD4P, it's a whole new animal and it seems like GBT learned from their earlier mistakes! :up:
If your really against going the Gigabyte route again, most folks have had good luck with the BioStar boards for unlocking...
no problem with my GA-MA790GP-UD4H (AM2+ 790GX and DDR2)Quote:
Originally Posted by Snowman89
and no problem unlocking my X2 550BE. I cannot say the same with my other Asus M4A78-E (AM3 790GX and DDR2).
For me, Gigabyte is the best at this moment.:up:
Yeah the Gigabyte MA790X-UD4P and MA790XT-UD4P are awesome boards
BOO !!
I just ordered myself a x2 550 and a Asus M4A78!
If only i had checked this place first :p i could have put another couple of pounds on and bought one of those gigabyte boards, I didn't think anything about unlocking cores when i was browsing boards lol
http://valid.canardpc.com/show_oc.php?id=621954
My 4Ghz overclock, I've successfully ran 20 tests on IBT and it passed and have run 3dmark06 without any BSOD's, crashing or any errors.
http://img195.imageshack.us/img195/8642/4ghzoc.th.jpg
What my desktop with CPU-Z, 3dmark06 and Core Temp. Using a Noctua here, and my load temps were just 32C max on IBT, very surprised because when I ran IBT on my Q9650, it went over 90C.
Ive got a 0924DPMW inc now. Didnt find anything about it on the internet so i hope it does good :)
My 0925APMW failed@4 core. Tho, had to test a little more...
But wanted to ask, is there any tool to change memtimings in win, like MemTest?
And, what do You recommend for stability testing? Prime, Orthos, OCCT, some other?
Also, what soft to use for CPU temp measuring? I get different strange results with coretemp, hwmonitor etc. And ET6 doesn't seem to refresh temp. It's not possible, that temp doesn't change under load. I use HR-01 Plus with 60CMF 120mm fan...
You mean Memset?Quote:
Originally Posted by ceemic
http://www.xtremesystems.org/forums/...ad.php?t=92190
AMD Overdrive tool allow this isn't it ?Quote:
Originally Posted by ceemic
Now here is my X2 => SUCCESS :up:
AMD Phenom2 X2 550 BE stepping 0919 EPMW
Gigabyte GA-MA790GP-UD4H
Bios : F3
Screen
[img=http://img8.imageshack.us/img8/6576/x2x43718.th.jpg]
http://img8.imageshack.us/i/x2x43718...x43718.th.jpg]
ASharp, sry typo. Yes I meant MemSet. But that 4.0 didn't work :rolleyes:
UD4 were troubled boards for even stock cpu's .. Thats why the UD4P replaces it;)Quote:
Originally Posted by Snowman89
I know because ive exchanged some UD4 for friends in the beginning of unlocking that thought the UD4 was the same as UD4P
,,,,,,,,,Its not.
UD4P is very stable and has great voltage options for overclocking and stability. Plus a very stable Unlocking Bios ATM.
X4 B50 Priming initiating....Time to live : 5 Hours
Program: Orthos
CPU: AMD X4 B50 7.5Mb Cache
Motherboard : Asus M4A78-E
BIOS : Official Asus 1208
Voltage CPU: 1.350v
Temp CPU: 45c (approx)
Status: Priming
http://evolusiotomobil.com.my/antoni...0/x4-prime.jpg
I see that someone has theirs listed as a tri core. I didn't know you can unlock just one core and run it as a tri core. Can someone tell me how this is done?