mainboard advice needed

[Ribbit]

I'm not convinced - it could be that the SCSI controller is on PCI bus 2, and its interrupts are mirrored to PCI bus 1 as shown on that page. This would make sense as part of the zero-channel-raid support on that slot. Unfortunately, I know nothing about ZCR, and Adaptec's website is devoid of hard technical information.

And as I said before, there's no room for the SCSI controller on PCI bus 1. The chipset only supports two devices on that bus, and there are already two slots.

I'll poke around and see if I can dig up anything - I'm curious to know what's actually going on with this board.

Edit: One way to be sure is to find someone running Linux on a K7X and ask for the contents of the /proc/pci file.

[VJ]

Answers from Tyan !

Well, Tyan has already replied to my questions (great feedback, one has to grant them that !).

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1. There is a 3.3V/5V PCI64/66 MHz slot. If it is set to
5V, does the entire PCI bus 1 fall back to 33 MHz?

Tyan: Even if you jumper the 1st PCI slot to 5v the 1st PCI bus will still operate at 66 MHz.


2. The 760MPx chipset only supports for 2 devices on the PCI 64 bit/66 MHz bus. In the faq, I could find that the onboard SCSI-controller is on PCI Bus 1 (the 64 bit/66 MHz, http://www.tyan.com/support/html/f_th_k7x.html ). If the 3.3V/5V slot is set to 5V (as in the first question), does that influence the entire PCI-bus (will the SCSI-controller now also fall back to 33 MHz ?)?

Tyan: If you install a 33MHz PCI card or jumper J92 to clock the PCI bus down to 33MHz then the entire bus will run at 33MHz. Otherwise it will default to 66 MHz.


3. How can there be support for 2 PCI64/66 slots + an
onboard SCSI-controller on the same bus with the 760MPx chipset ?

Tyan: The chipset specs do call for only 2 loads on the PCI bus. However, in our design it is possible to run 2 64bit PCI cards & the onboard SCSI all at 66MHz. Also, this board is qualified by AMD.
http://www.amd.com/us-en/Processors/...30_182_869_965^2340,00.html

edit: http://www.amd.com/us-en/Processors/...5e2340,00.html (if the ^ in the link gives problems)
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So basically, what this means is that setting the voltage of the 3.3V/5V slot does not influence the speed of PCI bus 1, but inserting a 33 MHz card does. The onboard SCSI-mystery remains, however.

Jörg