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Stepping of the CPU help
- Thread starter daNo-
- Start date
- Joined
- Nov 8, 2001
AMD doc
Script to identify a stepping
Its simply a code that describes the batch and production run the CPU came from, the time it was made, and possibly some sort of scroing system results when the CPU was tested. None of us know for sure exactly what the codes mean, but there are many theories. Here's an example:
AXDA2400DKV3C
AIXHB 0327 XPWM 9xxxxxxxx
This is not a complete code, but only the relevant parts of it.
The "K in KV3C in the first line is a signifier of what the default voltage is. The lower the better.
U = 1.65
K = 1.6v
L = 1.5v
2400 quite obviously identifes that this CPU is a 2400+ model.
AIXHB- The B in the last of the first 5 digits signifies this is a Thoroughbred B core, an A would me an A core. The first letter A has some significance as to the location on the wafer the chip came from. A is generally a bit better than J. K or R are not good. The 3rd digit has some significanc. Theis one will move down the alphabet as the process matures and generally the more towards the end of the alphabet, the newer and better the chip will be. The same is true of the 4th digit. Right now you find mostly U's or a very few X's in the 3rd digit, and almost always an H in the 4th digit.
"0327" - This is the year and week the cpu was made. Newer is usally better as small improvements are often made to the process.
The 9 with trailing x's- This is a serial number, but the first digit does have some significance. Usually a 9 or other number, but sometimes a "Y". Y's are the best. This is thought to have some meaning related to the scoring system for the tests run at the factory. the x's will actually be numbers/letters, a unique serial number for the CPU.
Script to identify a stepping
Its simply a code that describes the batch and production run the CPU came from, the time it was made, and possibly some sort of scroing system results when the CPU was tested. None of us know for sure exactly what the codes mean, but there are many theories. Here's an example:
AXDA2400DKV3C
AIXHB 0327 XPWM 9xxxxxxxx
This is not a complete code, but only the relevant parts of it.
The "K in KV3C in the first line is a signifier of what the default voltage is. The lower the better.
U = 1.65
K = 1.6v
L = 1.5v
2400 quite obviously identifes that this CPU is a 2400+ model.
AIXHB- The B in the last of the first 5 digits signifies this is a Thoroughbred B core, an A would me an A core. The first letter A has some significance as to the location on the wafer the chip came from. A is generally a bit better than J. K or R are not good. The 3rd digit has some significanc. Theis one will move down the alphabet as the process matures and generally the more towards the end of the alphabet, the newer and better the chip will be. The same is true of the 4th digit. Right now you find mostly U's or a very few X's in the 3rd digit, and almost always an H in the 4th digit.
"0327" - This is the year and week the cpu was made. Newer is usally better as small improvements are often made to the process.
The 9 with trailing x's- This is a serial number, but the first digit does have some significance. Usually a 9 or other number, but sometimes a "Y". Y's are the best. This is thought to have some meaning related to the scoring system for the tests run at the factory. the x's will actually be numbers/letters, a unique serial number for the CPU.
