A server has a single, half height, PCI-X 3.3v slot available. Which of the following cards can fit in this slot? (Select THREE).

A half-height, universally keyed PCI card is physically compatible with a half-height slot and electrically compatible because universal keying includes a notch for 3.3v slots. PCI-X slots are backward compatible with standard PCI cards, so this card will operate in the slot. The universal keying ensures it is not restricted to 5v-only operation.

A full-height card physically exceeds the clearance of a half-height slot and cannot be seated regardless of bus type or voltage keying.

PCI Express uses a completely different physical connector and high-speed serial signaling protocol that is electrically and mechanically incompatible with a parallel PCI-X slot.

A half-height, 3.3v PCI card matches both the physical half-height form factor and the 3.3v electrical keying of this slot. PCI-X is backward compatible with standard PCI, so a 3.3v keyed PCI card seats and functions correctly in a 3.3v PCI-X slot.

A half-height, universally keyed PCI-X card matches the physical slot dimensions and is electrically compatible because universal keying is accepted by 3.3v slots. It is a PCI-X card in a PCI-X slot, so it operates natively at full PCI-X bus speeds without any compatibility downgrade.

A full-height card cannot fit in a half-height slot due to the physical height difference, regardless of keying or bus compatibility.

PCI Express x8 has a different physical connector and serial bus architecture that is incompatible with a parallel PCI-X slot.