Q: 64-bit PCI - 66 Mhz vs 33 Mhz networking performance?

Peter Bowen pzb at scyld.com
Tue Jul 3 08:37:37 PDT 2001

Brian -

The Tyan Thunder K7, like all released dual Athlon motherboards, has
64-bit/33 MHz slots.  The 760MP chipset does not include support for
66MHz pci.  This is slated to be introducted with the 760MPX chipset,
due to be released later this year.

As far as I am aware, the only x86 motherboards with 64-bit/66 MHz PCI
are for Intel PIII chips and use a ServerWorks chipset.


On 03 Jul 2001 10:26:13 -0400, Brian wrote:
> Hi everyone,
>   I'm currently looking into the Tyan Thunder dual-K7 board, and I'm
> pretty sure it's only equipped with the 33 Mhz variety of the 64-bit PCI
> slot.  Does anyone have any real-world performance information on the
> difference one could expect with the 66 Mhz over the 33 Mhz?
> [Note: Microway's website, for their Beowulf Cluster, mentions that two of
>  the slots ARE 66Mhz, but Tyan's website seems to say otherwise.  Anybody
>  using the boards know for sure?]
>   In other words, should we wait for a board with a 66 Mhz bus?
>   Originally I was thinking of the difference with Myrinet, but since I'm
> not yet sure what our network requirements will be, any advice is more
> than welcome.  How do multi-port ethernet cards on those slots fare?  Or
> gigabit e'net?
>   Thanks for any info,
>   - Brian
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