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Cathar · 11-04-2004, 03:11 PM

I am presently part way through a larger article that covers the same issues, but in the time-being you may be interested in this post I made at OCAU:

How much pump is enough? How much pump is too much?

The MD30 is almost always a substantial step backwards away from using the MD20 in almost any realistics radiator based scenario. The MD30's simply put WAY too much heat into the loop, and the radiator allows the water to warm up by more than the waterblock improves CPU temps by.

Check it out. There are some surprises there. Some of the differences being touted by people when changing pumps simply are not realistic, with barely 1.5C differences between an Eheim 1048 and a "best possible case" pump for hot systems.

As stated, I am fleshing out a more detailed article, and I'll cover issues like varying CPU heat load, and GPU blocks with added restriction, and include a few different CPU blocks with different shaped flow vs C/W curves and pressure drop characteristics. From what I'm seeing here, and I have stated this in the past, at no time is a pump that draws more than a rated 50W of power a step forwards for better performance.

11-04-2004, 03:11 PM	#2
Cathar Thermophile Join Date: Sep 2002 Location: Melbourne, Australia Posts: 2,538	I am presently part way through a larger article that covers the same issues, but in the time-being you may be interested in this post I made at OCAU: How much pump is enough? How much pump is too much? The MD30 is almost always a substantial step backwards away from using the MD20 in almost any realistics radiator based scenario. The MD30's simply put WAY too much heat into the loop, and the radiator allows the water to warm up by more than the waterblock improves CPU temps by. Check it out. There are some surprises there. Some of the differences being touted by people when changing pumps simply are not realistic, with barely 1.5C differences between an Eheim 1048 and a "best possible case" pump for hot systems. As stated, I am fleshing out a more detailed article, and I'll cover issues like varying CPU heat load, and GPU blocks with added restriction, and include a few different CPU blocks with different shaped flow vs C/W curves and pressure drop characteristics. From what I'm seeing here, and I have stated this in the past, at no time is a pump that draws more than a rated 50W of power a step forwards for better performance. Last edited by Cathar; 11-04-2004 at 03:17 PM.