At the moment they have to be PC's, the image processing/correction/computational library's are all coded x86, you at the moment there is no choice. If you're wondering what they are for, I need to do some computation on massive amounts of data. Imagine trying to do error correction on 8, 14 megapixel sensors (16 bit pel) running at 8000 frames per second. That translates to around 2 terrabytes of data per SECOND. If 16 units will be too slow, I'll probably add another 1x16 cluster -_- I saw really thin clients on HP, but they're transmeta I'm also looking at your suggestion Kane, but it seems the height of the chassis for those boards is around 8 or 9 inches, I'm not sure that's thin enough. Tnx.