MDD Heatsinks

[Protools5LEGuy]

I have one 866 DP MDD. Can I use a 1.25 DP module with 866 DP MDD heatsink?

I readed somewhere there are 3 heatsinks for MDD DP. Aluminium Thick, Aluminium Thin and Copper Ones.

I plan to unleash the 166 bus at first, and buy a 1.25-1.42 cpu module from USA and keep using my original 866 DP heatsink. Is posible that, MDD friends?

[Protools5LEGuy]

Also I want to know from DieHard and Mactron about the best solutions for MDD

I mean AirBlow vs Liquid Cooling setups

I should only get 1.066 GHz clocking the 866 module with stock cooling.

My MDD 866 has original(?) 400W PSU

[lokki]

for anything above 1.25ghz dual you want to get the copper heatsink. 400w is the "old" power supply which tends to be noisier without modifications.

[Protools5LEGuy]

for anything above 1.25ghz dual you want to get the copper heatsink. 400w is the "old" power supply which tends to be noisier without modifications.

And the 1.25 DP cpu can be refreshed with the MDD 866 DP heatsink?

[lokki]

is it the low profile one? then i would say no. my 1.25 ghz dual with the high aluminium heatsink already gets pretty hot.

[supernova777]

i have this same 867mhz MDD! 
so i look forward to reading your progress !

i have to say that my mdd does not get very hot at all.
but then again, i did install extra fans on the back, 2 near the heatsink
1 blowing in each direction.. i had to cut these fans with a dremel tool
to make them fit in this location as the ones i got were sligthly too big..
its a ttotal hackjob but it is silent + cools well!

[Protools5LEGuy]

i have this same 867mhz MDD! 
so i look forward to reading your progress !

i have to say that my mdd does not get very hot at all.
but then again, i did install extra fans on the back, 2 near the heatsink
1 blowing in each direction.. i had to cut these fans with a dremel tool
to make them fit in this location as the ones i got were sligthly too big..
its a ttotal hackjob but it is silent + cools well!

A Picture perhaps?

[MacTron]

Heatsinks for MDD (my measures) :

Aluminium Thin: 0 C
Aluminium Thick: −1,7 C
Copper: −5C

With single CPU or Dual Up to 1,25 you can use aluminium Heatsinks. But with dual CPU over 1.25 Ghz the copper heatsink is the best option for sure.

I haven't tested liquid cooling setups. I have one dual 1.42 overclocked to 1.66. I hadn't made it to work fully stable with room temperature over 24C. "Luckly" this only happens a few weeks a year arround here
It is unique in the world that works with case closed -I think-
I'll put pictures if interested. But -in advance- this MDD is heavily modded

[lokki]

please post a picture!!

[Protools5LEGuy]

for anything above 1.25ghz dual you want to get the copper heatsink. 400w is the "old" power supply which tends to be noisier without modifications.

Any know an 3rd part. MDD cooler. Cooler Master, Nox, etc or a kit to adapt others?

The Copper ones are REALLY hard to find these days. And the price is $$$ compared to 120 mm fans heatsinks from socket 478, socket A, socket 775. Maybe we can find a model suitable for it cheaper than rare original copper ones.
http://www.alternate.es/html/listings/Hardware-Componentes-Refrigeraci%C3%B3n-Disipadores-de-CPU/11898?tk=7&lk=6559

I have http://www.alternate.es/Arctic/Freezer-7-Pro-Rev-2/html/product/138942? on my Q6600 OC to 3 GHz without a trouble. It can handle 95 Watts of dissipation.

[lokki]

lucky me, i just got a copper heatsink. and a whole mdd around swell 

[MacTron]

please post a picture!!

Here You have:

http://macos9lives.com/smforum/index.php?topic=927.0

[DieHard]

lucky me, i just got a copper heatsink. and a whole mdd around swell 

The copper Aftermarket coolers (and apple copper Coolers) were very common on ebay a few years back and were not that expensive... They are of course much better than stock (although I have only needed stock coolers); I have a few boxes of stock coolers for single and dual g4s and I can provide a free Apple stock (non-copper) cooler to anyone willing to pay shipping if I have the right one, I labeled most with a sharpie when I pulled them.

I do NOT work for welovemacs, but here is some info...

Apple part Number: Part Number: 076-0983, 076-0983-R

You can order it from them Here: http://www.welovemacs.com/0760983.html  $69

Also found 1 on ebay here

http://www.ebay.com/itm/Apple-PowerMac-G4-1-42-dual-Copper-heatsink-upgrade-for-MDD-/131141663354?pt=US_CPU_Fans_Heatsinks&hash=item1e88a6fa7a

[Jakl]

To Diehard can you please inform me whether the copper
pipes on these mdd heatsinks are filled with liquid coolant?

And is it possible to use these copper pipes on the heatsink
to attach to a radiator and move coolant into and out of the
heat sink?

Thanks

[supernova777]

A Picture perhaps?

my original inspirational source thanks to mr bdaqua
http://www.s155158671.websitehome.co.uk/aircoolingmddg4a.html

the two fans by the heatsink make a huge difference..
i set mine up to push & pull so it makes a vortex of new air cooling + whisking
away the heat.. in order to properly install u might need to remove
the heatsink  but i skipped this because i was lazy;) but i was still able to get my fans in place
i also was unable to use screws so instead i just used some twist ties to hold the fans sturdily
in place, and the power wires routed thru the heatink over to the drivebay area under the cds
where it connects to a 4pin molex

more from bdaqua's site:
http://www.s155158671.websitehome.co.uk/moremddcoolingmo.html

[DieHard]

To Diehard can you please inform me whether the copper
pipes on these mdd heatsinks are filled with liquid coolant?

And is it possible to use these copper pipes on the heatsink
to attach to a radiator and move coolant into and out of the
heat sink?

Thanks

Gas filled... not liquid... no Radiator possibility...

We have seen damaged coolers (bad nick in pipe) where we presume the gas escaped, and the cooler no longer functions and the system overheats, it is rare, but we have seen coolers of this type actually "go bad" on MDD and some HP/Toshiba laptops... the cooler stays cold and the heat no longer transfers (even after a fresh arctic silver job)... change the cooler and BAM.. works again

[Jakl]

So Diehard could this be done - I mean would it be possible?
Put simply
From radiator output 1 pipe into 2 out ext - joined to the start of the two separate
copper pipes on heatsink.
Then from the ends of these copper pipes take the two back to one rubber pipe
radiator input.

All I thought it would need would be some metal reinforcement (metal ring)
1 smaller pipe gauge than the copper pipe placed inside the copper
pipe to reinforce it when tightening a clamp - that's all.

What do you think? Any comments on the possibility?

[DieHard]

Who am I to say wether it is possible or not... where there is a will there is a way... I personally never tried it, I am not a fan of liquid cooled systems... this is just a bias statement due to many bad memories I have of the G5 liquid cooling fiasco where some models leaked so bad they blew MB, Processor, and Power Supply (located at the bottom) and basically turned an entire G5 into scrap... the new PC i5/i7 liquid cooling systems with "transmission radiators" seem to be rock solid... I guess only time will tell 

[Jakl]

Thanks.

[Protools5LEGuy]

But you still need a MDD compatible heatsink.

Yes very True, but that stock Aluminum thick Heatsink (as opposed to the thin one that looks like stainless steel) that comes with the 2002 Dual 1.25 works perfectly, so just aquire the CPU, clean the heatsink and CPU (look online) and use a small amount of Arctic silver (very small amount).  Very Easy Upgrade.

Also, from the MacTron Testing Labs, I will list the MDD heatsinks in order of BEST to Worst as far as heat transfer/Temperature:

1) Copper MDD Heatsink (comes with Dual 1.42 or buy aftermarket) TEMP = −5C
2) Thick Aluminum (Kinda looks like other G4 heasinks) TEMP = −1.7C
3) Thin Aluminum (Looks like stainless Steel) TEMP = 0C

Strange...     My MDD dual 866 has a thick Aluminium one and it has even the original AcBel PSU... Thick ones should be the oldest

From http://www.xlr8yourmac.com/systems/mdd_cooling_mods/MDD_cooling_mods.html


The thin one

From page http://arstechnica.com/civis/viewtopic.php?f=12&t=60191

Included is the second best heat-sink for these computers.

The best is the copper one.

Some affirm Thin one is better than Thick one. MacTron the opposite...

I think the thin one you have tested could be damaged, because it was supposed to be better and more modern than thick one. I can be wrong and I shouldn't doubt any results from M.A.R.L.