I'm glad to see this thread is still going after years!

The Arima Quads live on- myself and a friend from the local hackerspace picked up several of these boards from a reseller down here in Houston on the cheap and are (gradually) building them out. They are the blue boards, not sure on BIOS version yet. So far, we've got 3 boards with 4x Opteron 8350HE and 16GB each. We're still waiting on heatsinks to arrive then it's off to Fry's to get some 750W PSU's and molex connectors to modify their wiring harnesses. Two of the boards will be crunchers and will get RagePro's (but will probably run headless) and I'm crossing my fingers that mine will work with a spare Geforce 8800GT, if not it's time for some GPU-roulette. The crunchers we'll probably mount to a sheet of Lexan with standoffs but I'm designing a custom deskside case for mine- I don't have scans of the drawings handy but the design is inspired by the BlueGene-P racks with some added flair (and thermal management so I can use this thing in the Houston summer in a house with no A/C). I'll probably install Arch-Bang on mine and use it as a hilariously-overpowered graphics and GIS workstation; the hackerspace systems will be used in conjunction with a 128+ CPU Transmeta rack as sort of a DIY supercomputer for things like ultra-fine-grained audio waveform processing (the other fellow does audio engineering as a hobby), protein folding (but of course!), traffic pattern analysis (Houston has absurdly-configured traffic signal timings), meterology (Hurricane City!) and such. Stay tuned, and again, I'm very thankful for this community keeping a discussion on this strange bit of hardware.