backwards PCI slot?

[cavingjan]

Okay, we were talking about the new DDR boards in this thread and NFS4 scrounge up a picture of a motherboard by chaintech (kudos to NFS4)which had what we originally thought to be 6 PCI slots but its actually 5 PCI and one backwards PCI that is closer to the edge. What kind of slot is this?
picture of the board in question
Maybe Windogg's wannabe from the Off Topics Forum is way far ahead of us. Not!!!!

 

[arthurb1]

maybe to use with those blasted half cards? You know the ones with no bracket, for internals only, the ones that are suppsed to be dead? I dunno, after all it IS a Chaintech mobo...

 

[Mark R]

It's a CNR (communications & network riser) slot. It's for the new software modem/software lan cards.

Edit. Hmmm. Maybe it's not. Haven't a clue then.

 

[Gunbuster]

CNR is that big?

 

[cobain]

Its a 64 bit PCI slot I think.

 

[Mark R]

No, 64 bit PCI slots, are like extra long PCI slots.

There are 2 64 bit PCI slots on the 'Lincoln' motherboard on this page.

 

[arthurb1]

CNR is almost the size of an AMR I think...I know that Anand has done some reviews (with pics) of boards that have CNR instead of AMR slots. (maybe from a trade show)

 

[Viper GTS]

It's definitely not a 64-bit PCI slot. And I thought CNR/AMR slots were little... Like on the ASUS CuSL2. Mike lists the board as having 2 CNR slots, yet there's nothing that even closely resembles a backwards PCI slot. The two brown slots at the far left of the pic are the CNR slots.

I've heard rumors of cheap motherboards having PCI slots installed backwards, but I doubt chaintech would do something like that. Much less in a DDR sample board that would be photographed & posted on the 'net.

Viper GTS

 

[Mark R]

The interesting thing, is that the slot is offset slightly too, so it's definitely not meant to be a normal PCI slot.

Maybe it's some sort of upgrade slot - along the lines of the video memory upgrade for the i810.

 

[Noriaki]

I don't know for sure what that is, but I know a few things that it isn't...
I know it's not AMR or CNR, it's too long and white, those are both short and brown (shorter than AGP)
It's also not PIC64, those are quite a big longer than PCI32 and the left part of a PCI64 is a PCI32 (PCI32 cards can work in a PCI64 slot)

Maybe it's PCI-X? I thought those were going to look the same as regular PCI but maybe not...

 

[etech]

I think this will help.

ednmag article



<< Note that, although the riser sits in a PCI slot, it is not connected to the PCI bus. One of the main differences between ACR and CNR is that ACR is a regular PCI connector rotated 180&Acirc;° and slightly offset. CNR is a 60-pin edge connector, with the CNR components on the opposite side of a PCI card, so it can use the standard connectors and bracket. This setup allows a vendor to use either a CNR card or a PCI card in that bracket space, thus enabling a motherboard to support or upgrade from a low-end CNR modem to a high-end PCI modem card. One advantage of CNR is that, although an ACR system may have an ACR slot and three PCI slots, an equivalent CNR system has either a CNR slot and three PCI slots or four PCI slots. ACR, however, supports AMR legacy designs, directly supports DSL, and has plans to include wireless-interface support. >>

 

[Viper GTS]

And a regular PCI card will fit in a backwards PCI slot that's closer to the edge of the case?

???

Viper GTS

 

[Sir Fredrick]

It's probably offset in such a way that you can only use the ACR or the PCI, not both. You know what I'm talking about, remember those motherboards that had X pci slots and 2 ISA slots, but if you used both of the ISA slots you couldn't use the bottom PCI slot because it was blocked by the ISA card?

 

[Noriaki]

Oh yeah I forgot about ACR

We have AMR, CNR and ACR.

That's what the &quot;backwards PCI slot&quot; Is.
It'll be an ACR.