[NTLUG:Discuss] Discuss Digest, Vol 91, Issue 14
John Fields
wigthft at gmail.com
Sat Jul 24 12:56:14 CDT 2010
In production the biggest difference between PCI v2.1 and v2.2 was
supporting 3.3 volts.
In v2.1 it was 'suggested' to add in the power supply work to supply a
3.3v rail to the socket. In v2.2 it was mandatory.
Since this 'feature' is not specific to a particular chipset, model #,
etc. I don't believe you can determine it from software without a
lookup table built from empirical testing - which to my googling eye
does not exist.
There may have been a software feature first seen in v2.2, or was last
seen on v2.1 but again detecting hardware features like that from the
OS is not always possible.
So you have a card which either prefers or requires 3.3v. If the card
has circutry to convert 5v from that rail to 3.3v internally - you are
golden; it will work in a v2.1. But since the voltages are on
different rails (socket pins) it shouldn't damage the card, just not
power up and work.
Just plug it in and see (the old fashion testing method) ;)
JF
On Jul 24, 2010, at 12:00 PM, discuss-request at ntlug.org wrote:
>
> Howdy,
> Does anyone know of a command I can run to tell me what version of
> the
> PCI bus I have on a system? I have a card that needs PCI 2.2 or newer
> and I have some systems I want to check for compatibility. I have
> found
> specs on some system, but not all.
> Good day,
> Ralph
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