Identifying VIA C3 CPUs \ VOGONS

Identifying VIA C3 CPUs

Topic actions

First post, by ShovelKnight

Posted on 2020-05-29, 08:20

ShovelKnight Offline

Rank Oldbie

Rank: Oldbie
Posts: 588
Joined: 2019-04-04, 19:00

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:

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...

Reply 1 of 11, by kolderman

Posted on 2020-05-29, 08:41

kolderman Offline

Rank l33t

Rank: l33t
Posts: 2570
Joined: 2019-05-12, 04:22

All mine a clearly marked. Pics of front and back?

Reply 2 of 11, by ShovelKnight

Posted on 2020-05-29, 08:49

ShovelKnight Offline

Rank Oldbie

Rank: Oldbie
Posts: 588
Joined: 2019-04-04, 19:00

It looks like this. Is this an Ezra or a Nehemiah or?..

The attachment F9190E28-72BC-466D-AF20-883FE8BF313E.jpeg is no longer available

The attachment ED99B7A3-EB4D-4A66-B9C7-33B57D18A3BD.jpeg is no longer available

Reply 3 of 11, by matze79

Posted on 2020-05-29, 08:59

matze79 Offline

Rank l33t

Rank: l33t
Posts: 2999
Joined: 2014-12-12, 14:25
Location: Germany

EDIT:
Its already ERZA Core.

Reply 4 of 11, by ShovelKnight

Posted on 2020-05-29, 09:39

ShovelKnight Offline

Rank Oldbie

Rank: Oldbie
Posts: 588
Joined: 2019-04-04, 19:00

Thanks.

Reply 5 of 11, by kolderman

Posted on 2020-05-29, 10:08

kolderman Offline

Rank l33t

Rank: l33t
Posts: 2570
Joined: 2019-05-12, 04:22

Yeah thats an ezra. they go up to 1ghz. look out for the 100mhz fsb ones as they can be slowed down even better. you should be able to play games up to around quake2 on this.

Reply 6 of 11, by ShovelKnight

Posted on 2020-05-29, 10:13

ShovelKnight Offline

Rank Oldbie

Rank: Oldbie
Posts: 588
Joined: 2019-04-04, 19:00

I already have an Ezra. I switch FSB speed in software so it doesn't really matter.

Reply 7 of 11, by Tetrium

Posted on 2020-05-29, 16:13

Tetrium Offline

Rank l33t++

Rank: l33t++
Posts: 9614
Joined: 2010-01-27, 18:53
Location: Netherlands

When reading this page https://en.wikipedia.org/wiki/List_of_VIA_C3_microprocessors apparently the various iterations of Via C3 had different voltages for different cores with Samuel2 having 1.65v, Ezra and Ezra-T having 1.35v and Nehemiah having 1.4?v (with ? being either 5 or 0).
For some reason I've never seen a s370 VIA C3 clocked at 1.3GHz or 1.4GHz. Fastest I ever seen is 1.2GHz.

Whats missing in your collections?
My retro rigs (old topic)
Interesting Vogons threads (links to Vogonswiki)
Report spammers here!

Reply 8 of 11, by ShovelKnight

Posted on 2020-05-29, 17:12

ShovelKnight Offline

Rank Oldbie

Rank: Oldbie
Posts: 588
Joined: 2019-04-04, 19:00

I saw this page and also what info is available at CPU World. They don’t mention 1.25V CPUs though.

Reply 9 of 11, by Danger Manfred

Posted on 2024-08-30, 05:21

Danger Manfred Offline

Rank Member

Rank: Member
Posts: 116
Joined: 2022-08-15, 03:35
Location: Germany

ShovelKnight wrote on 2020-05-29, 08:49:

It looks like this. Is this an Ezra or a Nehemiah or?..

The attachment F9190E28-72BC-466D-AF20-883FE8BF313E.jpeg is no longer available

The attachment ED99B7A3-EB4D-4A66-B9C7-33B57D18A3BD.jpeg is no longer available

My VIA C3 800A MHz looks exactly like that, including the 6x133 MHz and 1.25V.

I got it as part of a Neoware CA2 Thin Client that was marketed as having an 800 MHz Ezra-T CPU.

However, CPU-Z identifies it as Nehemiah, and SETMUL can set it to 10.5x133 (1400 MHz) on stock voltage and it's still benchmark stable, so I suspect it might really be a Nehemiah instead.

Reply 10 of 11, by mmx_91

Posted on 2024-08-30, 05:45

mmx_91 Offline

Rank Member

Rank: Member
Posts: 198
Joined: 2015-05-08, 13:12
Location: Northern Spain

Danger Manfred wrote on 2024-08-30, 05:21:

My VIA C3 800A MHz looks exactly like that, including the 6x133 MHz and 1.25V.

I got it as part of a Neoware CA2 Thin Client that was marketed as having an 800 MHz Ezra-T CPU.

However, CPU-Z identifies it as Nehemiah, and SETMUL can set it to 10.5x133 (1400 MHz) on stock voltage and it's still benchmark stable, so I suspect it might really be a Nehemiah instead.

Isn't the A suffix the identification for Nehemiah core? At least it was this when talking about Epia boards, If I remember correctly.

Many years have passed 😀

Reply 11 of 11, by Danger Manfred

Posted on 2024-08-30, 06:19

Danger Manfred Offline

Rank Member

Rank: Member
Posts: 116
Joined: 2022-08-15, 03:35
Location: Germany

mmx_91 wrote on 2024-08-30, 05:45:

Danger Manfred wrote on 2024-08-30, 05:21:

My VIA C3 800A MHz looks exactly like that, including the 6x133 MHz and 1.25V.

I got it as part of a Neoware CA2 Thin Client that was marketed as having an 800 MHz Ezra-T CPU.

However, CPU-Z identifies it as Nehemiah, and SETMUL can set it to 10.5x133 (1400 MHz) on stock voltage and it's still benchmark stable, so I suspect it might really be a Nehemiah instead.

Isn't the A suffix the identification for Nehemiah core? At least it was this when talking about Epia boards, If I remember correctly.

Many years have passed 😀

It would certainly explain the absurd overclocking headroom. 75% more clockspeed is no joke.

Go to top of page Go to top of page

Back to General Old Hardware