Specifications

Any of these PCI slots could be chosen for the installation of your Myrinet/PCI interface.

However, for best performance, a 64-bit interface should be installed into a 64-bit PCI

slot.

Installed interface (with attached riser card)

Caution: Although PCI riser cards are commonly used,

they will generally violate PCI specifications for the

length of signal traces. A riser card may also introduce

impedance discontinuities and signal degradation

between the mother board, riser card, and interface card.

If you observe PCI-communication errors when using a

riser card, see if the problem persists when you plug the

Myrinet/PCI interface directly into the PCI slot. A higher

quality riser card -- one whose traces match the

impedance of signals on the mother board and interface --

may also solve the problem.

Also, it is important that a 64-bit riser card be used in a

64-bit PCI slot, and likewise a 32-bit riser card should be

used in a 32-bit PCI slot. Otherwise, the Myrinet/PCI

interface will not be correctly detected and/or serious

performance irregularities will result.