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Gymnut
Sep 10, 2003, 01:14 PM
Not sure if this has been posted before but for those who have not seen this from xlr8yourmac.com, there is development for a water cooling kit for the G4 MDD. While this article was posted in April, it is interesting to see whether it is closer to reality or been scrapped. Anyone familiar as to what if any speed gains one might achieve by installing a water cooling kit? I know heat buildup is a problem but is a water cooling kit merely for show and less noise or does it actually have some real world use.

http://www.xlr8yourmac.com/systems/watercooled_MDD_G4/watercooled_mdd_g4.html

MacBandit
Sep 10, 2003, 01:27 PM
Originally posted by Gymnut
Not sure if this has been posted before but for those who have not seen this from xlr8yourmac.com, there is development for a water cooling kit for the G4 MDD. While this article was posted in April, it is interesting to see whether it is closer to reality or been scrapped. Anyone familiar as to what if any speed gains one might achieve by installing a water cooling kit? I know heat buildup is a problem but is a water cooling kit merely for show and less noise or does it actually have some real world use.

http://www.xlr8yourmac.com/systems/watercooled_MDD_G4/watercooled_mdd_g4.html


Watercooling has nothing to do with performance unless you plan on overclocking you machine in which case it does provide better cooling. What it does do though is allow you to run your machine much much quieter in most cases.

Last I knew this kit was available but they didn't have one for a dual cpu model. Also I requested info on an external kit as I have both my optical bays filled. At the time they had no plans for either. Too bad really.

Gymnut
Sep 10, 2003, 04:52 PM
It seems they were or are testing a dual processor kit. Not sure how old this is tho.


http://www.third-gen.com/wc/rigs/Steve/Steve.htm

MacBandit
Sep 10, 2003, 04:58 PM
Originally posted by Gymnut
It seems they were or are testing a dual processor kit. Not sure how old this is tho.


http://www.third-gen.com/wc/rigs/Steve/Steve.htm

That would be cool but the photos are of a single processor rig. Go figure?:confused:

rainman::|:|
Sep 10, 2003, 05:37 PM
alternative cooling, such as mini air-conditioning and watercooling (they're about the same thing, minus a blower), is used almost exclusively in overclocking. as was said there's no performance boost, and it's just a noise thing, people don't usually go to the trouble for the sake of noise-- plus, some of these cooling setups can be noiser than normal fans. overclocking's main restriction, besides chip instabilty, is heat, so if you find an effective way of removing it, you can go higher.

i remember seeing a cluster of experimental PPC prototype machines on loan from IBM in an unnamed government research lab, this was a few years ago. They had cracked the cases off of 'em and wound up with aquarium air pumps blowing on the processors, just to keep them from melting. it was pretty weird... i think they were getting ready to put in a large-scale water cooling system.

of course, liquid is better at removing heat, since it's much denser molecularly... more molecular interaction means more heat exchange. Since mineral oil doesn't conduct electricity, you can just submerge your motherboard in it, if you don't mind having a tub of oil sitting there with wires snaking out... you don't even have to move the oil around, convection keeps it that much cooler than big fans would.

pnw

BIGgui_X_
Dec 5, 2003, 07:59 PM
Does anyone of you know why raising the core voltage of a CPU helps in overclocking ?? I understand the multiplication thing, but, I often see that someone was only able to overclock his CPU when he raised the voltage to 1.9, or 2 V , etc... I plan to, maybe, overclocck my dual 1.25 to 1.33, or maybe more... so i'm interested to know more about that and watercooling too !!
thanks

Phatpat
Dec 5, 2003, 08:30 PM
I'm pretty sure you need to increase the voltage because as you overclock and the processor gets faster, it needs more power to remain stable.

blue&whiteman
Dec 5, 2003, 08:34 PM
keeping a machine cool only means it will run at its full potential so you're not really making it faster, just letting it be all it can be :) a hot cpu won't perform at 100%

I have discovered the wonders of silver thermal paste. I swear by it!

MacBandit
Dec 5, 2003, 08:36 PM
Originally posted by BIGgui_X_
Does anyone of you know why raising the core voltage of a CPU helps in overclocking ?? I understand the multiplication thing, but, I often see that someone was only able to overclock his CPU when he raised the voltage to 1.9, or 2 V , etc... I plan to, maybe, overclocck my dual 1.25 to 1.33, or maybe more... so i'm interested to know more about that and watercooling too !!
thanks

As you clock it faster and faster the resistance in the circuits becomes a larger and larger problem. So you increase the voltage thus overcoming the resistance.

This will work in some cases but you also need to increase your cooling due to the extra heat brought on not only by the chip running at the higher frequency but also the higher voltage.

This can also lead to the premature death of the chip due to material transfer at the atomic level. If you don't know about this then you aren't ready to be doing this type of overclocking and need to read into it more.

BIGgui_X_
Dec 5, 2003, 08:42 PM
that is exaclty what i'm doind now :)

slowtreme
Dec 6, 2003, 09:06 AM
FWIW, I water cool my main PC because the fans required to keep it cool were too damn loud. I keep the others PCs off when not in use. My two macs are relatively silent, so they are a non issue. But I don't have a windtunnel mac ;)

MacBandit
Dec 6, 2003, 11:48 PM
Originally posted by slowtreme
FWIW, I water cool my main PC because the fans required to keep it cool were too damn loud. I keep the others PCs off when not in use. My two macs are relatively silent, so they are a non issue. But I don't have a windtunnel mac ;)

For anyone that uses a PC regularly the noise out put of the wind tunnel Macs are greatly over stated.

slowtreme
Dec 7, 2003, 06:57 AM
Originally posted by MacBandit
For anyone that uses a PC regularly the noise out put of the wind tunnel Macs are greatly over stated. Well the point that I didnt make very well was: Although I watercool my PC, it is only to reduce sound. I do not overclock it at all. I do use a Quicksilver Mac at work and it is louder that the (desktop) PCs next to it, but in a busy office enviorment it all blends. In my home I want my computers quiet.

MacBandit
Dec 7, 2003, 05:25 PM
Originally posted by slowtreme
Well the point that I didnt make very well was: Although I watercool my PC, it is only to reduce sound. I do not overclock it at all. I do use a Quicksilver Mac at work and it is louder that the (desktop) PCs next to it, but in a busy office enviorment it all blends. In my home I want my computers quiet.

I agree completely. Water cooling is a very affective way to quiet a PC or Mac.

In my experience top of the line PCs those running high end graphics cards with large power supplies fast hard drives and a high end processor are every bit as noisy as the newer PowerMacs.