Family: Argon (Model 1)
Model: AMD-K7500MTR51B C
Speed according to marking: 500MHz
Cache: 512kB
cache multiplier: 1:2
CPU VCC: 1.6V

(unfortunately I was given this CPU already without the enclosure, however I don't expect to see any mismatch between case marking and core speed due to the fact it's the slowest Argon model)

Family: Pluto (Model 2)
Model: AMD-K7600MTR51B A
Speed according to marking: 600MHz
Cache: 512kB
cache multiplier: 1:2
CPU VCC: 1.6V

Interesting thing: AMD soldered core rated for 650MHz on this unit

Family: Pluto (Model 2)
Model: AMD-K7650MTR51B A
Speed according to marking: 650MHz
Cache: 512kB
cache multiplier: 1:2
CPU VCC: 1.6V

Interesting thing: AMD soldered core rated for 800MHz on this unit

Family: Thunderbird (Model 4)
Model: AMD-A0900MMR24B A
Speed according to marking: 900MHz
Cache: 256kB
cache multiplier: 1:1
CPU VCC: 1.75V

Interesting thing: AMD soldered core rated for 1000MHz on this unit

It would be really great to have photos from you as well. I'm working on some improved version of GFD. I hope these photos will help to spot all differences between Models in each Athlon Family.

I have a Thunderbird (Model 4) AMD-A0850MPR24B A. How do I open the cartridge ?

Opening the case is a bit tricky. For sure special care must be taken during the process of opening it to avoid potential damage to components soldered on PCBA.

However it's possible as you can see from my photos. Moreover once the case is removed you get access to service connector on the top. You can plug in GFD device there and do Overclocking of CPU.

The metal heatsink has 4 pins which go into holes in plastic case. So the process of removing plastic case is about prying off these 4 pins from plastic case holes. 3 of them are quite easy but the last one is really annoying. For all CPU I opened it was always the same one to make pain in the neck.

Once case is gone than there are 2 metal springs holding heatsink plate on the PCBA. Please secure PCBA on each side with some supports to avoid balancing of heat sink plate on the CPU core during removal of springs. There is a risk of carcking of core on some side.

I've attached some photos for reference.

Thanks, tho info is useful. My CPU is different. It's in a cartridge like SECC(2) with a heatsink attached. I wanted to know how to open the cartridge. Do you know how it's done?

Please share the photo of your CPU. This will help me to understand your case.

zami555 wrote on 2023-09-22, 16:36:

Family: Pluto (Model 2) Model: AMD-K7600MTR51B A Speed according to marking: 600MHz Cache: 512kB cache multiplier: 1:2 CPU VCC: […]
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Family: Pluto (Model 2)
Model: AMD-K7600MTR51B A
Speed according to marking: 600MHz
Cache: 512kB
cache multiplier: 1:2
CPU VCC: 1.6V

Interesting thing: AMD soldered core rated for 650MHz on this unit

Identical CPU and scenario here.

600MHz Pluto on the casing, 650MHz core inside.

paradigital wrote on 2023-10-06, 11:28:

Identical CPU and scenario here.

600MHz Pluto on the casing, 650MHz core inside.

Do you happen to have the same manufacturer for cache ICs? If yours are different please share the photos.

Slot A Athlons are designed to use cache chips with 2.5V or 3.3V power supply. One pin in Athlon slot, VCC2SEL, defines this.

Identical cache unfortunately.

Family: Pluto (Model 2)
Model: AMD-K7850MPR52B A
Speed according to marking: 850MHz
Cache: 512kB
cache multiplier: 1:2.5
CPU VCC: 1.7V

Interesting thing: AMD soldered core rated for 950MHz on this unit (is it Orion????)
Big thanks to Varus from 3dfx.pl for lending this CPU to me for taking photos.

Family: Argon (Model 1)
Model: AMD-K7700MTR51B C
Speed according to marking: 700MHz
Cache: 512kB
cache multiplier: 1:2
CPU VCC: 1.6V

Interesting thing: This is the fastest model from Argon family
Big thanks to Varus from 3dfx.pl for lending this CPU to me for taking photos.

Family: Thunderbird (Model 4)
Model: AMD-A1000MMR24B A
Speed according to marking: 1000MHz
Cache: 256kB
cache multiplier: 1:1
CPU VCC: 1.75V

Interesting thing: his is the fastest model from Thunderbird family for Slot A
Big thanks to Varus from 3dfx.pl for lending this CPU to me for taking photos (unfortunately the plastic cover is "somewhere"... if only Varus found it I will add it to this post).