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RE: Voltages in PCI
- To: pci-sig@znyx.com
- Subject: RE: Voltages in PCI
- From: Ivor Bowden <ivor@peritek.com>
- Date: Tue, 04 Jun 2002 10:15:13 -0700
- Old-X-Envelope-From: ivor@peritek.com
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- Resent-Date: Tue, 4 Jun 2002 10:25:53 -0700
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I have tried to upgrade older PCI MBs to have 3.3V, and found they
were not even bussed! I had to to provide 3.3V via extender card.
-Ivor
At 10:21 AM 6/4/2002 -0400, Ingraham, Andrew wrote:
>> The Motherboards compliant with PCI 5v have the 3.3V?
>
>Motherboards that comply with PCI Revisions 2.2 or 2.3 have the 3.3V.
>
>Prior to PCI Revision 2.2, which was introduced in December 1998, the 3.3V
was optional on motherboards with 5V signaling. If they did not ship with
3.3V, they were supposed to provide an upgrade path so the customer could
add it later. That was the theory, but I don't know how many manufacturers
really provided the means to upgrade.
>
>Even though the current Specification requires the 3.3V, there might be
motherboards still being built that comply only with the older Revision 2.1
Spec (or that do not compy with any Spec), and do not have the 3.3V.
>
>Regards,
>Andy
>
>
>