Weird mis-labeled Athlon Slot A?

[Am386DX-40]

Ok, so sometime ago I got an Athlon 700 slot A "classic" (I mean, non-thunderbird) and created a record for it in my database (just a crappy excel sheet btw) acording to the writings on the top of the plastic case.

Today I was finally able to test it and check it with cpu-z and other tools and found something quite interesting:

There are 3 types of Athlon 700 in Slot A format:

"Argon" core (Model 1 aka "K7", 250nm), part number AMD-K7700MTR51B C
"Pluto" core (Model 2 aka "K75", 180nm), part number AMD-K7700MTR51B A
"Thunderbird" core (Model 4, 180nm), part number AMD-A0700MPR24B A

Now here comes the tricky part, mine says AMD-K7700MTR51B A on the top of the plastic case, which would mean it's a Pluto/K75 core, but as soon as I powered it on and checked it, it appears to be an Argon core (and it sure gets hot as hell). I'm pretty sure the case has not been replaced, it's the original one. May it be from the time they were transitioning from K7 to K75 and somehow misprinted it or some plastic cases got mixed up?
I've checked the dates and the K75 was introduced on November 99, and this cpu has a manufacture date code of week 1, January 00.
Any ideas?

[Mr.Scott]

I have a few as well.
CPUz misreads the ID string.
It misreads the Orion cores also.

[Am386DX-40]

[debs3759]

[Neon]

ya, I'd say if CPUID says 612 then you have Argon, regardless the part number on the case.

Have you tried other Pluto core processors, and do they read CPUID 621? If yes, then your example above is a strange mismatch. However, if CPUID is still 612 for other Pluto core processors, then maybe it is a BIOS issue.

[debs3759]

[Am386DX-40]