It's well known that VIA C3 CPUs had different core revisions:

- Samuel/Samuel 2
- Ezra/Ezra-T (where T stands for "Tualatin")
- Nehemiah

Recently I was thinking about getting Ezra-T and Nehemiah in addition to my 800 MHz Ezra, the main problem however is that they are all marked simply "ViA C3" and it's difficult to identify them.

Voltage is one possible indication of what's inside. As far as I understand, all 1.35V CPUs (plain ceramic or gold top) have the Ezra core, and all 1.45V CPUs are Nehemiahs. What about 1.25V parts though?

Are there any lists of VIA CPU part numbers? This is what my CPU (plain ceramic Ezra) says on the underside:

(C) (M) VIA C3(tm)
1.35V A350C00
0248 Taiwan
D239700-08

It looks like A350C00 is the part number. All photos of Ezra CPUs I could find show this code starting with "A350".

Nehemiah CPUs have SMD parts on the top of the package and their part number starts with AG60. At least that's true for 1.2 GHz Nehemiahs currently on eBay.

However, I also found a 800 MHz C3 with SMD caps on top, part number AG60AB1S and 1.25V voltage. Is this an Ezra-T or a special low power version of Nehemiah?

Questions, questions...