CNR. (Communication / Network Riser)
I think you nailed that Blue Slot Larry - Wonder if anyone used it - LOL
Most the NF2 N400 Boards came with 1 AGP and 5 PCI Slots - Weird DDR1 Dim configuration and Flaky SATA Controllers but man a Single Core AMD Barton XP trounced just everything Intel had at the time.
I believe, the nForce KN8 for Dual Core 64-Bit AMD CPU's was the next step up and the last of nForce Chipped MB's and supported nVidia SLI PCIe GPU's.
I still have both of them nForce MB's in the Gigabyte offering.
I did use a Promise IDE Raid Card at one time ;o)
Here's the VIA Apollo Pro 133A Slot 1 that you could run a Socket A 370 Intel 1.3 Ghz Taulatin FC-PGA2 Celeron at 1700 to 1800GMhz's with 150Mhz VZ SD Dims using a vidded Slot 1 to 370 Converter Card. They did build a Socket 370 version of this MB the next year:
6 PCI slots and an ISA Really! Note where that battery is! That MB has a 200Mhz Clock Generator for a 132 Mhz CPU - Doesn't mean you can't run the CPU and Dims at 138+ Mhz's with insane voltage ;o)
Eat your heart out Abit and the Intel 440BX. Still have that Hot Rod and Boots WinSE - With out a doubt a beautiful machine that runs the old AGP ATi 9700, 9800 and 2700XT's and either an Intel or AMD CPU. Probably the Last of it's kind.
Here are the nForce Boards I have. Both are presently running Win7 32-Bit Ultimate as the MB's are limited to 3 and 4 GB's of DDR1 400 respectively:
GA-K7N400 Pro (Rev2) Socket A 462 for the Single Core AMD Athlon Barton XP CPU's:
Easily runs at 2200 to 2500Mhz +Mhz with with either a 1.833 or a 2200Mhz AMD Barton XP.
GA-KN8 SLI Socket 939 for the Dual Core Athlon 64-Bit x's 2 Toledo (Stacked Bartons) CPU's:
Easily runs between 2500 to 2700Mhz's and GTX280's in SLI. Generally you could run 2GB's of DDR400 at around 418Ghz's @ CAS 2-3-2-1T @ 418 Mhz in Dual Channel or the same CAS with 3GB of DDR400 in Single channel for a 32-Bit Win OS - Really not enough RAM for say a WinXP or Win7 64-Bit OS but it worked if you had the KN8 NF4 nForce Chipset.
I don't believe the KN8 NF4 ever supported DDR2. I could be wrong on this - Lets hear it - If it did - It would be a great WinXP and Win7 64-Bit Platform and a very rare MB ;o)
OCZ (Samsung) and Patriot (Mozel) DDR 400 really worked on the nForce MB's.
Gigabyte built great nForce MB's but EpoX is considered the Holey Grail as EpoX don't exist anymore.
There was a time when AMD CPU's with nVidia nForce MB's put Intel P3 and P4's to shame.