68kMLA Classic Interface
This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.
| Click here to select a new forum. | |
| Best CPU for a MDD G4 without overheating | |
| Posted by: Unknown_K on 2012-11-11 00:11:53 I got a different board and CPU for my MDD (Dual 1Ghz 167 FSB) and was wondering if the 1.25ghz of 1.4ghz DP is worth getting since I hear they overheat. My old CPU was 867 DP and 133 FSB. Didn't the faster speed chips have a solid copper heatsink instead of the aluminum ones? | |
| Posted by: Macdrone on 2012-11-11 05:08:48 The dead MDD I have is a dual 1.25 and has an aluminum heat sink. | |
| Posted by: ClassicHasClass on 2012-11-11 06:43:23 Aluminium, but I never had any issue with overheating. The Sonnet G4 card I have in it now has a fan, though. | |
| Posted by: waynestewart on 2012-11-11 07:32:56 Only the 1.42 ghz came with a copper heat sink. A dual 125 or 1.42 will be faster as not only are the processors faster, they also have a larger cache. If you get a 1.42 then it might be a good idea to score one with the heat sink. When you installed the dual 1ghz, I hope you altered the motherboards bus speed resistors. If not then your 1ghz processors are likely running very slowly | |
| Posted by: Unknown_K on 2012-11-11 11:50:46 The dual 1ghz came with the correct motherboard so no mods needed (one of the reasons I got that combo was so I didn't have to mod my old board). P.S. there are 2 kinds of Al heatsinks from the looks of it, one is extruded and the other looks like it was made from sheet material pressed together? | |
| Posted by: waynestewart on 2012-11-11 20:56:59 The extruded one is the earlier one, later they switched to the sheet metal one. The base is a solid piece of aluminum and it looks like the fins are glued on. I’ve heard that the later one was better for cooling but I’ve never gone through the trouble to do any tests. I’ve used the original in a dual 1.25 overclocked to 1.33 ghz without overheating problems and I really pushed that one. Once I was curious to see how long it would take to render a particular 1080P video clip. It ran full speed for about 2 days before it finished. | |
| Posted by: trag on 2012-11-12 15:45:07 Dual 1.33 GHz G4 CPU cards are also commonly available for the MDD. They come from the G4 Xserver. They're easier to find, usually, than the dual 1.42 GHz cards. One Ebay seller has had new ones (Apple Service Parts) for sale for $75 + shipping for a couple of years. But it doesn't include a heat sink, which could be an issue if you're going from single CPU to dual CPU. I've often toyed with the idea of trying to mount some of the LGA775 heat sinks in the MDD on the dual G4s. The trick is to find one with a long enough base to cover both CPUs (some have it) and which isn't too tall to fit in the space. Also, oriented so that the fan is blowing through the fins and not against the fins when the heat sink is covering both CPUs would be good. Of course the other trick would be to machine some kind of base to mount on the MDD screw holes and provide the proper mounting holes for the LGA775 heat sink. | |
| Posted by: uniserver on 2012-11-12 17:00:32 I have the dual 1.25 MDD, the HS Appears to be extruded. Right now I can still boot Mac OS 9.22 If I found 1.42 cpu's for this thing, wonder if Mac OS 9.22 would have any issues? all i saw on ebay was this one running @ 1.40 http://www.ebay.com/itm/PowerMac-Mac-MDD-G4-DP-Dual-1-40GHz-CPU-Processor-820-1470-A-/400328914870?pt=CPUs&hash=item5d357677b6 | |
| Posted by: Unknown_K on 2012-11-12 17:35:40 The second revision MDD must be quite different for it to not boot OS 9 (Firewire 800 and airport extreme). | |
| Posted by: waynestewart on 2012-11-12 22:19:39 The aluminum heat sinks on the single and dual are identical. One Ebay seller has had new ones (Apple Service Parts) for sale for $75 + shipping for a couple of years. But it doesn't include a heat sink, which could be an issue if you're going from single CPU to dual CPU. | |
| Posted by: waynestewart on 2012-11-12 22:23:53 If it boots OS 9 now then it changing the processor won't matter at all. It'll still boot OS9 I have the dual 1.25 MDD, the HS Appears to be extruded. | |
| Posted by: uniserver on 2012-11-12 22:25:44 That is what I thought, thanks. | |
Posted by: trag on 2012-11-13 14:33:10The aluminum heat sinks on the single and dual are identical.Ah, thank you. Good to know. I had heard it both ways, so was not certain. | |
| Posted by: trag on 2012-11-13 14:35:23 Going back to the hacking in an LGA775 heat sink, this one has the needed attributes, if one could create a mounting adapter on which to screw it in securely. XP-90  Also, the Enzotech Ultra-X, although it's a little trickier, since the heat pipes should maybe be facing away from the case fan, and therefore the heatsink may stick too far into the middle of the case. And the height just barely clears.  And the OCZ Tempest  | |
| 1 |