VIA C3 Nehemiah vs. Coppermine(-128) and Tualatin

Discussion about old PC hardware.

Re: VIA C3 Nehemiah vs. Coppermine(-128) and Tualatin

Postby infiniteclouds » 2018-2-03 @ 19:11

Off /Off / On / Off on the FSB block. I actually didn't test 112Mhz.

I did try removing both sound cards and booting up with the mimimum ... the IDE/SD adapter, graphics card and RAM. I'm using just 1 stick of 128MB PC133.
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Re: VIA C3 Nehemiah vs. Coppermine(-128) and Tualatin

Postby infiniteclouds » 2018-2-12 @ 04:13

Update -- 112Mhz works okay... but 133Mhz is a no go for the 6BXC. I actually have a second rev 2.0 board I picked up not long ago that I tested and it has the exact same deal -- 122x10.5 runs... 133x10.5 will freeze up.

It is interesting what the seller is suggesting. Would be nice to have all the details of his modification, but I understand if he wants to keep some tricks to himself.


Only other things mentioned was ...

And please let me know you can solder 1608 SMD parts.
There is some modification for MS6905 for old M/B.

And I have used a GA-6BXC for couple of years at about 1999 years.
It was long time ago. so I can not remember details,
But, I remember the 6BXC had a memory problem when large memory copy instruction was executed.
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Re: VIA C3 Nehemiah vs. Coppermine(-128) and Tualatin

Postby infiniteclouds » 2018-4-02 @ 21:18

gerwin wrote:I have seen that too. But that may be because of a lazy/uninformed former user. These boards have the 'voodoo jumpers' which need to be set for power hungry video cards, including Voodoo 3 and Geforce. If not then the VRM near the AGP slot will get very hot and the capacitors near it will suffer.


I was wondering -- is there are reason to not have these voodoo jumpers set? Once I have them set for Voodoo 3/Geforce can I just leave them like that at all times or will there be older AGP cards that will then suffer? I have to wonder this because there must have been a reason they made it jumpered..
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Re: VIA C3 Nehemiah vs. Coppermine(-128) and Tualatin

Postby gerwin » 2018-4-03 @ 12:15

Another vogons member pointed out that the AGP specification at the time instructed motherboard designers to include a VRM specifically for the AGP slot. So the Voodoo jumpers actually bypasses this official specification. All I can think of is that the AGP specification assumes that the normal 3,3 Volt rail was to noisy or something, or that the AGP hardware would affect the 3,3 Volt rail.
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