AMD Stepping FAQ

[Micutzu]

STEPPINGS

The stepping code is a 4 or 5 letter string printed on the CPU either on the core (on Morgan Durons , Athlons and Athlons XP with Palomino core) , or on a black label near the core (on the Athlons XP Tbred core, Applebred Durons or Bartons) . Every stepping indicates a revision/change in the CPU manufacturing process , wich usually has an impact on the overclockability and on the temperature of the CPU .

Duron Spitfire:

600-800: AKAA < AKCA < AKBA
800-950: AKCA < ALCA < AMCA = ANCA < ANDA

Duron Morgan:

AHHAA < AHLCA < AHLDA
9 < Z < Y

Athlon Thunderbird :

AXHA = ALUM < AQGA = AGGA = ASHHA < ADFA < AJFA = ARGA < AXIA = BXIA = AVIA = AXIAR < AVHA = BVHA < AYHJA = EYHJA < AYHJAR
9 < K < Y

Athlon Palomino:

AGKFA < AGKGA < ARKGA < AGLHA < AGNGA < AGOGA < AGOIA < AROIA < AROGA
9 < 4 < K < F < Y

Athlon Thoroughbred :

A : AIRCA < AIRDA < AIRGA < RIRGA < RIWGA < RIUGA < AIUGA < AJUGA

B :
1600+ : KIUHB < JIUHB
1700+ and 1800+ : JIUCB < JIUGB < KIUHB < JIUHB < JIXHB < NIUHB < JIXIB
over 2000+ : AIUAB < AIUCB < AIUGB < AIUHB < AIXIB

Athlon Barton :

AIUAA < AQUCA < AQXCA < AQXDA < AQXEA < AQZEA < AQXFA < AQFZA < AQYFA < AQYHA < AQZFA

Duron Applebred :

MIUHB < MIXHB < MIXIB

It seems AMD started locking the CPU's after week 39. See the end of the post for details.




PROCESSOR CARACTERISTICS


Palomino - 0.18 microns , model 6 , FSB 266 , cache : 128K Level1 , 256K Level2

Name Mult X FSB Vcore Power

1500+ 10.0 X 133 1.75V 53.8W
1600+ 10.5 X 133 1.75V 56.3W
1700+ 11.0 X 133 1.75V 57.4W
1800+ 11.5 X 133 1.75V 59.2W
1900+ 12.0 X 133 1.75V 60.7W
2000+ 12.5 X 133 1.75V 62.5W
2100+ 13.0 X 133 1.75V 64.3W
2200+ 13.5 X 133 1.75V 00.0W

Thoroughbred A - 0.13 microns , model 8 CPUID 680 , FSB 266 , cache : 128K Level1 , 256K Level2

Name Mult X FSB Vcore Power

1700+ 11.0 X 133 1.50V 44.9W
1800+ 11.5 X 133 1.50V 46.3W
1900+ 12.0 X 133 1.50V 47.7W
2000+ 12.5 X 133 1.60V 54.7W
2100+ 13.0 X 133 1.60V 56.4W
2200+ 13.5 X 133 1.65V 61.7W

Thoroughbred B - 0.13 microns , model 8 CPUID 681 , FSB 266 , cache : 128K Level1 , 256K Level2

Name Mult X FSB Vcore Power

1600+ 10.5 X 133 1.60V 48.5W
1700+ 11.0 X 133 1.50V 44.9W
1800+ 11.5 X 133 1.50V 46.3W
2000+ 12.5 X 133 1.60V 54.7W
2100+ 13.0 X 133 1.60V 55.9W
2200+ 13.5 X 133 1.60V 57.0W
2400+ 15.0 X 133 1.65V 62.0W
2600+ 16.0 X 133 1.65V 64.0W

Thoroughbred B - 0.13 microns , model 8 CPUID 681 , FSB 333 , cache : 128K Level1 , 256K Level2

Name Mult X FSB Vcore Power

2600+ 12.5 X 166 1.65V 64.0W
2700+ 13.0 X 166 1.65V 64.0W
2800+ 13.5 X 166 1.65V 66.0W

Barton - 0.13 microns , model 10 , FSB 333 , cache : 128K Level1 , 512K Level2

Name Mult X FSB Vcore Power

2500+ 11.0 X 166 1.65V 53.7W
2600+ 11.5 X 166 1.65V 00.0W
2800+ 12.5 X 166 1.65V 55.9W
3000+ 13.0 X 166 1.65V 58.4W

Barton - 0.13 microns , model 10 , FSB 400 , cache : 128K Level1 , 512K Level2

Name Mult X FSB Vcore Power

3000+ 10.5 X 200 1.65V 56.5W
3200+ 11.0 X 200 1.65V 58.4W

Applebred - 0.13 microns , model 8 , FSB266 , cache : 128K level1 , 64K Level2

Name Mult X FSB Vcore Power

1400 10.5 X 133 1.50V 00.0W
1600 12.0 X 133 1.50V 00.0W
1800 13.5 X 133 1.50V 00.0W



UNLOCKING

The Duron , Athlon Thunderbird , Athlon XP Palomino processors have the multiplier locked from the factory , and to unlock it you must connect the L1 bridges . It will unlock all the multipliers in the 5X-12.5X range , except for the XP2100+ and XP2200+ with Palomino core , wich will have the 13X-18.5X range available . On any CPU you can toggle between the multiplier ranges (5-12.5X to 13X-18.5X) by changing the connection of the L10 bridges (cut one and connect the other) .

The Athlon XP Thoroughbred core and Barton processors have the multiplier unlocked from the factory , so any motherboard that has the option for multiplier setting cand adjust it . The processors under 2000+ have the 5X-12.5X range available , and the 2100+ and higher have the 13X-18.5X range available . The exceptions are XP2600+ / 333FSB and Barton 2500+ , wich have the 5X-12.5X range available . To toggle between ranges , you need to connect/cut the rightmost L3 bridge .

AMD started locking the multiplier on their CPUs after week 39; while some of the CPUs made during weeks 39-42 are still unlocked, all the ones from week 43 and later come multiplier locked. The only method discovered so far to set the multiplier on locked CPU's is explained here.

Known locked steppings :

PQZEA 0332
AIXHB 0340
AQFZA 0341 XPMW
AQXCA 0340
AQXEA 0341 MPMW
AQXFA 0339
AQXFA 0342 RPMW
AQYFA 0341
AQYFA 0342
AQZEA 0341
AQZFA 0339 UPMW
AQZFA 0341 XPMW
AQZFA 0342 TPMW
AQZFA 0342 UPMW



Known unlocked steppings :

AQZEA 0339 UPMW
AQZFA 0340
AQZFA 0342 TPMW

The AQZFA 0342 UPMW and the AQYFA 0340 are on both locked and unlocked chips.



If you have knowledge of a stepping not listed here, feel free to shoot me a PM .

[ExtremeAMD]

This should be made a sticky. Very helpful micutzu20. Thanx

[Micutzu]

Yeah i saw in another thread that someone was asking for this ...

[ExtremeAMD]

Lot's of people have been asking for this. I think you answered them at least 2 of the times, heh. STICKY!

[Overclocker]

Thanks man I know I asked for that. WooHoo!!

[PCGenious]

yea <chant>sticky sticky sticky</chant>

[danimal]

AGNGA that was my 1800+ it sucked. I love my new AGOIA

[Micutzu]

What's the max oc on the 1800+ AGNGA ?

[godzakka]

Hey, micutzu, do you know or could you list the average OC's based on the steppings, especially for the Palomino's and T-bred's? I am not sure you know this though, as I am sure its hard to find that info.

[Micutzu]

I have it for some chips , but i need to ask around a lot to find it for all of them . Also it may depend on what vcore/cooling everybody is using ...

[godzakka]

Right, thats why I say "average", since there are huge variations. Maybe a better question would be what is the average high end for aircooling and average high end for water cooling? That of course, just makes it even harder to find, though. Sorry, I am making your life hard, aren't I? I will stop now.

[dynetk]

The avg ocs based on steppings would be inaccurate because people use different components. If you overclock the bus you're running agp/pci out of spec and some of the lesser cards will crap out before the cpu does. Some motherboards provide better overclocking than others. I think chong mentioned too that even with the same stepping one chip was able to get 100mhz more than the other.

[danimal]

my AGNGA 1800+ only got up to 1.68 GHZ

[Drozdov]

nice, this should definitely be a sticky.

BTW, on my T-Bird 1.1ghz it says ASHHA not ASHA

[Drozdov]

heres what it says:

A1100AMS3B
ASHHA 0132RPDW
96853550466

this chip is maxed out at 1.2ghz, u CANT go any higher.

[Micutzu]

Thanx , Droz , i did the update .

you'll see a new stepping this week. a really kickass new stepping.

[Micutzu]

For the Tbreds i believe . Cuz the Palominos are not made anymore . Is that for the 2400+ ?

yup. and the 2600+

[frozenguy]

there is a 2400? and 2600?
i should get me some of thsoe!!!!!!
hehehe
hey, how do you know what kind of stepping you are getting?????