ob was dran ist ??? ... ging damals um den T-Bred
Part IV : Additional Codes
WPMW, SP1W, XPMW, XPCW, MPMW have no special meaning to the end-user, but according to the AMD Athlon XP Thoroughbred B Datasheet, the Third alphabet out of these 4 alphabets represents the number of production run/batch on a particular production date. For example, A represents the first batch of product on that week, B is the second batch, C is the third batch and so on;
It therefore can be said the first few batches have the best quality and purity, made from the purest wafer and finest assembling.
Other than A, B, and C, M represents the combined lots from many batches which cannot pass the Quality test (QC) for labeling as higher model like 2700+ but still can be marked as 2400+ for example.
Other than M, they are many alphabet out there eg. R, I, S, and even digits like 1 to 9. Codes with digits are deemed to be one of the poorest quality wafer, like SP1W. They have been combined and re-combined again after abandoning the poorer one from other batches. They are not finished at one go, instead they are finished after several runs of producing, which means they may fail the QC and passed to re-labelling line (Just my guess.)
That's why, those with codes like XPCW and WPCW can be overclocked to unexceptional levels even with default voltage !!
kleiner Nachtrag:
Part VIII : Other particulars
Here's one example, focus on the underlined digits:-
AXDA1700DUT3C 9361333260135
JIUHB0302 XPCW M C 1999 AMD
The first underlined 7 digits are guessed to be:-
i) The serial number of wafer.
ii) The grading code of CPU core.
Which really does not carry any meaning to consumer, unless got certain batch which had been proven to be very overclockable.
Meanwhile, the last 4 digits means the batch production serial number of CPU in one batch of production, all CPU with 0001 - 0300 will relatively have very high chance to be overclocked at higher speed than others.
My own assumption, the best production will be carrying the code:-
XXXXXXXYY0001
Who has it???????? Our site admin se7en has one 270001…