[BJB]

I am putting together my first watercooling system. I have a DD Maze3, 1/2 ID tubing, Chevette heatercore, and a Maxijet 1200. I am second guessing my decision on the 1200, because of some posts I read, particularly the flowrate sticky. I know that more flow is better, but it sounds like it may be counter-productive if the energy output of the pump outweighs the benefit of the increased flow. The Maxijet 1200 has an increase of only 65 gph over the 900, but it has an increase of 11.5 watts over the 900. Taking these two factors into consideration, it would appear that the 900 would be the better and more efficient pump if the extra flowrate cannot overcome the increase in energy output. However, I also know that head plays a factor here as well, and the 1200 has a max head of 69" while the 900 has a max head of 46". My question is, how will the increased head of the 1200 factor in to the results of these two pumps while keeping all other components the same? Will the extra 65 gph of flow overcome the extra energy being added to the water witht he 1200? Has anyone used both of these pumps in the same system? If so, which performed better? Thanks in advance for any information that anyone can give me to help me make an informed decision.

[mfpmax]

If its cheaper than the 1200, get the 900...I only got the 1200 because the 900 was only $1 cheaper.

[Wangster]

That is a great and well worded question and unfortunately, short of a controlled laboratory setup and calibrated measurements one will not be able to find out.

Maybe BillA has a comment on this? Are there any charts on this scenario available?

Wangster

[Stedeman]

I got the 900 for the power reasons I felt the same way. I also have the 600 and it kept a 1.2 Athlon cooled to 90 deg F idle

[UnLoadeD]

I don't know for a fact, but I'd think the heater core would be able to handle the extra 11.5w and you would be better off with the 1200. If you had a very small rad it might be a concern then.

peace.
unloaded

[Since87]

Originally posted by Wangster
That is a great and well worded question and unfortunately, short of a controlled laboratory setup and calibrated measurements one will not be able to find out.

Maybe BillA has a comment on this? Are there any charts on this scenario available?

Wangster

Certainly to get BillA type accuracy you need a lab like Bill's and the experience to use it. However it's possible to come up with ballpark ideas of part of the answer.

Lacking data from Bill on the Maze3, and not knowing how well the the Chevette HC matches Bill's "Big Momma", and not having been able to find actual PQ curves for the maxijet pumps, and not knowing what the percentage of the headloss in the system will be lost in tubing and fittings....

This graph may still be of some use:



The point where the blue and yellow curve intersect gives a ballpark flowrate with the MJ1200.

The point where the purple and yellow curves intersect gives a ballpark flowrate with the MJ900.

Now look through Bill's article, "Waterblock Bench Testing Results" to see how much difference the flowrate will make in the block's thermal impedance (C/W).