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#1 2014-10-15 01:51:48

jholt5638
Member
Registered: 2014-10-14
Posts: 16

Overclocking a MDD 867

I am debating on attempting to overclock my DP 867 MDD, I'm on the fence since the heatsink is already pretty warm to the touch. From what I've read the next step up is 933MHz it is primarily a OS9 box with excursions into Leopard or Wheezy. I assume the MDD's already run hot anyone ever overclock one or are they pretty at their heat limit as is?

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#2 2014-10-15 02:22:36

ClassicHasClass
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From: Electron Alley
Registered: 2014-05-26
Posts: 1,099
Website

Re: Overclocking a MDD 867

Why not just find a faster MDD?

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#3 2014-10-15 06:08:53

macdrone
Member
From: Rainier, Or
Registered: 2014-05-25
Posts: 231

Re: Overclocking a MDD 867

Or just the processor card.

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#4 2014-10-15 15:23:25

ClassicHasClass
Member
From: Electron Alley
Registered: 2014-05-26
Posts: 1,099
Website

Re: Overclocking a MDD 867

Yeah, although these days it may not be much, if at all, cheaper.

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#5 2014-10-16 20:01:50

macdrone
Member
From: Rainier, Or
Registered: 2014-05-25
Posts: 231

Re: Overclocking a MDD 867

But shipping will be much cheaper.

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#6 2014-10-16 21:07:07

iMic
Administrator
From: Adelaide, Australia
Registered: 2014-05-12
Posts: 883
Website

Re: Overclocking a MDD 867

I don't have any first hand experience with overclocking an MDD, but I have overclocked QuickSilvers and Digital Audios before. From what I've read, the Dual 867MHz G4s do have some room to move without overheating, in some cases all the way up to 1080MHz with a 166MHz FSB overclock. That said, since every processor behaves differently when pushed beyond its factory operating parameters, it's difficult to estimate how your machine will behave with an overclock in place.

If I was in the same situation, I'd aim for 933MHz and be prepared to do some cooling work in the process, like some fresh quality thermal paste and perhaps another fan over the CPU cooler. Most of all though, unless you have a steady hand and prior experience with soldering, I'd be prepared to have to replace the processor card in case anything goes wrong.

Overall I think the performance increase would be minimal at best, especially for OS 9 applications. If chasing performance figures is your thing though (and I can certainly relate) then it's completely your call on how you choose to proceed with this one.


A couple of threads I found while searching that may be of some use:

Mac OS 9 Lives - MDD 866 Mods

AppleTalk Australia - MDD Overclocking Guide (Internet Archive)

Xlr8YourMac - G4 (Mirrored Drive Doors) Processor Module Speed Settings


Cheers,

~ iMic.


Resident Professor of Alternative Methodology
Faculty of Macintosh Restorations & Modifications - "It works, let's fix it!"

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#7 2014-10-16 21:55:48

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,407

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