shevalier wrote on 2025-05-08, 15:23:

That's why I wrote Graphics test #4 + CPU test #1 […]
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That's why I wrote
Graphics test #4 + CPU test #1

This combination is very good at revealing instability due to load type changes.
High GPU load + average CPU load, load drop when loading the next test, high CPU load and average GPU load.
I had about the same thing.
It crashed when there was a sudden change in context, for example, a change in location in Far Cry.
I went into the corridor - reboot, went out into nature - hung.
That is, at the moment when a large amount of data begins to be transferred via AGP.
Only with the Radeon 9800 this happened once every few hours, and with the 2600 PRO - several times an hour.

Well, i'll do the tests. No harm in it. However the system really is stable in this configuration: https://valid.x86.fr/ctcxyg

I've played through at least KOTOR1/2 on it, this is like few hundred hours with zero crashes. Do not mind tiny 5% overclock, that was removed when replacing the card.

Second (gigabyte) board i am much less confident in, it has its own issues with RAM. I'd expect the issues to be different on different boards though, not the same, that's why i used it to verify they are the same...

Then I really don't know what to assume.
But I'm more than sure that it's not a software problem.

shevalier wrote on 2025-05-08, 15:53:

Then I really don't know what to assume.
But I'm more than sure that it's not a software problem.

Thanks for trying to help. Yeah, it is confusing and suspicious to me too.

May be i should try to set it up on a bench and see what's happening with those voltage rails when i run stuff...

I always use Catalyst 9.1 first, and use 10.2 or newer only (like 11.4/11.6), if game has issues for Terascale things.
AGP or not, you just have to force install official driver by picking it from Advanced installation list (otherwise it won't install at all).