A little question for you Pros?

[XTATDSM]

how much flow/head am I loosing running my MCP650 at 9 volts (less noise)?

by the way my temps did not get effected at all running the pump at 9 volts instead of 12 volts.

thanks

[Ruiner]

Originally Posted by XTATDSM

by the way my temps did not get effected at all running the pump at 9 volts instead of 12 volts.

thanks

That's your answer. Who cares how much flow/head you lost.

[XTATDSM]

hehehheh, I obviously do plus I am sure others would like to know too (if the pump still puts out good head/flow at 9 volts which means at a very very low noise, it might just be the pump some of us are looking for)

yet another question, will the MCP650 at 9 volts outperform the DDC pump in a 1/2" ID system that has swiffy MCW50+6002+2x dual heatercore mounted externally?

[AngryAlpaca]

Has your stability changed? If not, does it matter?

[lolito_fr]

From this thread on OCAU (sub. required) which was I think for the "rev 1" D4:

Peak Pressure Head (mH2O) @ 0 flow - all values to be considered ±0.05m and were rounded to closest 0.05m interval. These were measured by hanging a length of tubing from a ladder on the second story landing of my house and marking the water levels reached at each voltage.

5V: 0.65m
6V: 1.05m
7V: 1.50m
8V: 1.95m
9V: 2.40m
10V: 2.90m
11V: 3.35m
12V: 3.90m

The 12V value of 3.90m is somewhat higher than officially stated (3.50m), but I checked this a number of times, including using a multimeter to verify the voltage. I have the ability to run the pump at up to 16V, but ran out of tubing (only had 4m of it attached to the outlet).

Would guess that max flow at 9v would be roughly 75% of max flow at 12v.

[Ruiner]

I wonder how much less heat is transferred to the water at 9v compared to 12v. The drop should be more than linear.


What did you use to downvolt that pump?

[XTATDSM]

I used an AC power supply along with a relay to turn it on when the PC starts. I have been running like that for a week or so. I just tried the pump now at 12 volts and oh my god, this thing is just too loud at 12 volts. I just finished gaming for like 2 hours and my CPU never went above 37C and it idles now at 33C (this is at 9 volts) not bad I guess for having Prescott at 3.9 and 6800 ultra at 450/1.12, running in the same loop that is. and b4 anyone tells me how the MB temp readings are all messed up, running the very same board and everything with my old Aquaruis III cooling only the CPU my temps from the same board were like 38C idle and 54C load.


I just don't get it, why in the hell would my temps stay the same if I am running the pump at 9 volts, it's not like I am unhappy or anything, I just wonder why.

[Etacovda]

Theres not really much more cooling to be had from increasing pumping power - even the blocks that benefit from it most will barely see 3 degrees C. With a swifty, they have a pretty shallow performance curve, you wont really notice the cooling difference unless your flowrate was very, VERY low.

Motherboard temperature readings (especially P4 ones) are terrible at best. Don't take any stock at ALL in what they have to say. Ive had my bios reading below ambient.

[XTATDSM]

aha. ok now that does make sense.
thanks