"Dual Processor" G3

Posted by: Waragainstsleep

"Dual Processor" G3 - 07/14/05 07:48 AM

So how about a dual proc G3 system with independant frontside busses for each proc....?

I may have mentioned one of my projects in other threads. I had two aluminium cases made up for a pair of Beige G3s I want to use as Xgrid agents. They are very simple metal boxes with a lid which slides or lifts straight off. They are only about 3 inches high, but go back further (about 20 inches) as I inteded to rack mount them.
The change in dimensions was acheived by moving the CDROM drive and floppy from above the logic board (where they are in the original stock case) to in front of the logic board. So all the components (logic, floppy, CD) would be on the same level, with the HD mounted above the floppy drive.
I have delayed installing anything in the new cases since I can't find my Dremel, but I thought I'd finally give up looking and make do with a drill and a hacksaw. While I was measuring out the mounts for the logic board, I noticed that I could dump the CDROMs and floppies, and fit both boards in just one of the cases (leaving the other free for something else later - sadly not big enough for my Xserve).

I will need to extend the ports on one board to the back of the case, but aside from that, its just a matter of finding room for the HDs (not essential, I could always net boot them) and some cooling. Both chips are only 266MHz at the moment. I'll swap them when I can get hold of some faster ones, but an overclock will have to suffice in the meantime. So some fans on the front of the case and some ducting may also be in order.

Anyone know of an ATX PSU which is 3 x 3 inches (or less) x any length up to 18 inches? Its also gonna need to be at least 300W....
Posted by: maestro

Re:"Dual Processor" G3 - 07/15/05 04:35 AM

You may be able to find a micro atx supply that might fit, or you could just use an outboard
Posted by: adam123

Re:"Dual Processor" G3 - 07/15/05 05:29 AM

You may try searching for 1U power supplies. They are usually shorther than 3 inches in one dimension, and slightly wider , like 4 or so in the other. You might find one that is not that wide however, I am just not sure. 2U may also be short enough, and because it will be slightly taller, it may be a little less wide.
Posted by: whitlock

Re:"Dual Processor" G3 - 07/15/05 06:08 AM

5" Wide X 2.5" Tall X 4 " Deep = Micro ATX

If you need a link, here is one: Micro ATX
Posted by: Waragainstsleep

Re:"Dual Processor" G3 - 07/15/05 10:56 AM

Hmm. That one looks pretty nice. I was going to use a single high power supply for both machines, but at that price and those dimensions, I could get easily get two in there.
I had originally planned to use an out board PSU at 500 or 600W to power three or four of these rehoused G3s. Since the Beige takes an ATX supply, Its a simple matter of making up a splitter harness to power more than one at a time. My plan was to fold the cases out of sheet metal as I needed them. Since these boards are cheap, I could then add more to my rack as I wanted. Thing is, when a friend of mine offered to make up the cases for me in exchange for a cheap hard drive, he brought me cases made of 3mm polished aluminium, folded beautifully and welded up to boot (I had planned to use simple brackets to reinforce the corners)!!!
I then realised that I couldn't make any more this good, I couldn't ask him for any more free ones (he did them at work at had another guy weld them for him), I probably couldn't afford to pay him to make any more, and I really don't need endless racks of G3s anyway. Hence the new plan.....

Thanks for the responses guys. I was starting to think along the lines of a server supply of some sort, but I hadn't even thought about Micro-ATX.