RE: [myrinet] PCI bus speed

Hi Keith,

The AlphaServer 4100 and all it flavors (4000, 4100, 4100LP) only offers
33MHz PCI.  All Alpha based products to date (August 2001) have either been
32bit/33MHz or 64bit/33MHz or a combination of those two.

Compaq will not be shipping an Alpha processor based 64bit/66MHz PCI bus
system until later this year.

I cannot comment on Alpha clones.

tim

> Tim Tenhave
> Compaq Computer Corp.
> HPS/HPTC Custom Engineering
> ZKO1-1/D41
> 110 Spit Brook Road
> Nashua, NH 03062
> * (603) 884-4272 
> *Email:  [email protected]
> FAX (603) 884-3313
> http://www.compaq.com/solutions/customsystems/hps/linux.html
> 


-----Original Message-----
From: Keith Parkins [mailto:[email protected]]
Sent: Wednesday, August 29, 2001 1:09 PM
To: [email protected]
Subject: [myrinet] PCI bus speed


Hi,

We have an alpha (4100) and were only getting 33Mhz set for the PCI bus
rate when we loaded the gm driver. I noticed that the myri(LANai7) cards
support 66Mhz bus rates but only if the PCI bus is 3.3v. I have been
digging around and can't find whether or not the bus on the 4100 is 3.3v
or 5v. It is a rev3 PCI bus. Does anyone know this spec? If this is not
why the bus is getting set to 33Mhz, how do I set it to 66 Mhz? I didn't
notice anything obvious in sysconfigtab (running Tru64 v.4.0F).

Thanks!
Keith