5v 3.3volt PCI TUNER BLUES

My understanding is that recent motherboards

that use Intel chipsets: 915P 925X 865 875

are NOT able to use a PCI card that has

it's input and signal levels at 5 volts.

This is called by the standards group

"PCI 2.3". But the 2002 era Intel 845 chipsets

are "PCI 2.2" which is 5 volts. I have

been told that all PCI tuner cards need

5 volts, and have a slice into the PC card

toward the front of the computer, between

two gold fingers, signifying a 5V card.

For example, the new Blackbird

(Avermedia M150 for example MMCEM150B, Conextant

chip, hardware MPEG2 encoder, $65);

and the old Hauppauge WinTV-Go; and all

other tuners, 5v PCI. BUT, I myself

tried a WinTV-Go in a Asus P4C800-E

motherboard using the Intel 875P chipset,

which Intel says is PCI 2.3 and thus 3.3

volts only, and yet the tuner worked fine.

In what circumstances, motherboards, chipsets,

and tuners can one actually get a PCI tuner

to work in a new Intel chipset motherboard?

(925x 915p 865 875) ?? I want to buy a new

Asus P5AD2-X (925x chipset [3.3v]) and Avermedia

M150 Blackbird [5v], but expect they won't

work together. Thank you! tivoj Japan