On Dec 13, 12:16 pm, PETER WARNER <pe...@petermwarner.com> wrote: > I feel like This has been hashed over here before, but I could not > find it in a quick look at previous posts. Googling threw me for a > loop, since I saw people talking about 12 volts on "pin 4"? > > So, can a MDD dual processor be put in a Dual 450 GigE? > > Thanks, > Peter
Absolutely, yes! I did the conversion on a GigE Dual G4/450 (overclocked to 500MHz). Works great! I replaced the stock fans in the PSU with some 35cfm quiet fans I bought at fry's Electronics. I mounted the MDD PSU to the top inside of the GigE case by removing the upper front and rear handles, the top and rear case plastic, and then drilling four holes in the top of the system case to accommodate the mounting tabs of the MDD PSU. You have to be careful when laying out the holes to accommodate the latch/lock mechanism of the case side door. The MDD PSU slides and locks into place in the four holes. You can use a single set screw to retain the PSU, as well, but it is quite secure just using the tabs and a patch of aluminum foil duct tape at each tab on the outside top of the case before reinstalling the top and rear case plastics. Then you reinstall the case plastics and handles. Next, you need to purchase a 12" 24-pin x 24-pin PSU extension cable to use to rearrange the MDD PSU cable wires to match the requirements of the GigE main logic board. There is no need to cut any of the socket away at the main logic board end of the adapter/extension cable (24-pin) to fit it to the main logic board socket (22-pin), as the unneeded/extra/empty two positions of the adapter hang over the end of the main logic board socket with no problem. Care must be taken to make sure you have followed the wiring diagrams for the necessary changes in wire positions for the adapter, and taken into account the extra, empty connectors at the main logic board end of the adapter/ extension cable. There are good guides located here: <http://tinyurl.com/62n8kk> <http://tinyurl.com/yaf9u7a> My installation was a little slicker than the ones shown. I took the guts out of the old GigE PSU, leaving only the power receptacle and 110/220 voltage switch. I then cut the PSU enclosure panel (the vertical front end, opposite the rear GigE PSU fan, sidefacing the front of the case) of the GigE PSU enclosure down so it was a little taller than the top of the power outlet of the GigE PSU was tall. I folded the rear/top panel (installed position view; otherwise it would be the large square bottom/side panel, if the PSU were sitting on a desk with the large square top panel removed) of the GigE PSU at the height of the cut front end panel/power outlet so that it would fold over and enclose the power outlet of the GigE PSU, forming the new top and facing side panels of the modified GigE PSU enclosure. The rear panel (fan/power outlet panel facing the rear of the case) of the GigE PSU was left intact so a new fan could be attached blowing out the rear of the case as normal, and the modified GigE PSU could be attached by the case screws through the back panel as normal. I ran the power cord from the MDD PSU through a rubber grommet installed in the cut down front end panel (side opposite the GigE PSU fan/power outlet) of the GigE PSU, and attached it by soldering it to the power leads of the GigE PSU power outlet. I used aluminum foil tape to seal the modified GigE PSU case. It worked like a charm, and was good looking (mirror finish), as well. I then installed a new, quieter fan with a nice LED to the unmodified rear panel of the GigE PSU, and attached it to a spare molex connector to power it. I reinstalled the modified GigE PSU into its original place in the case. The original external power cord connected to the modified GigE PSU makes the system look completely stock. The use of the modified GigE PSU allows the normal connection and disconnect of power to the system, and the retention of the PSU fan location aids the cooling of the MDD PSU fans, and the case. The only way to tell the system has been modified is to open it up. The system front panel power button/card works normally to turn the system on/off/restart. Some work, but very satisfying. Plus, no problems with 28Vsb as that is standard in the MDD PSU. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
