Can 2 MCP655 Pumps in parallel increase Head and Flowrate? - Overclock.net

Cpt.Zero · 08-16-08

which of the 2 illustration gives the best head and flow rate?

microman · 08-16-08

thats not how you would run them but the answer is yes. you would wanna run them in line with eachother so res pump pump rad. ya dig?

Cpt.Zero · 08-16-08

hmmm if in line, the first pump is only pushing water inside the inlet of the next pump and i guess that would not pust extra water outside the next pump?

or is it ok if the loop is res 1> pump1> 360Rad> CPU> NB> Pump2> SB> GPU> Res 1?

and can the heat generated by pump2 add up to the loop if not run through another rad?

Cpt.Zero · 08-16-08

@microman

hey man what is your cpu voltage, nb voltage and sb voltage for the 4.1ghz Q6600 in getting that 23k score at 3dmark06? thanks

**ira-k** · 08-17-08

I like to keep mine in series when I run dual pumps, it will double your head and give you 20-40% or so more flow..I did bucket test them, but its been a while, I've forgotten now..

You might want to take a look at Martins flow calc on the TFC rad, I'd go with a 480 for all that...Honestly I wouldn't do SB and that type of thing, its just added restriction that will take away from the CPU...If you are after max clocks a CPU only loop is the way to go..If you only do moderate OC'ing other blocks in the loop aren't quite as bad...

Heres Martins rad calc's..Radiator Thermals and Radiator Calculators - Martin ..Add your total heat dump in wattage, punch in your fan rpm that you want to use, a little bar graph will pop up on the right side, try to keep that at a 5C and under for good performance...That is the temp your coolant will be pulled down to with your rad and fan combo, if you get much over a 5C rad out its getting into HSF range I think..The lower you can keep the rad out to ambient temp, the better off you will be...If you don't have Excel to view the calcs with you can download a freebie "Open Office.Org" thats what I use with them and it works fine...

Shrouds are the cheapest several C that you can get WC'ing...I use 120x38mm rad fans to, they have a lot more pressure and will scavenge air through the rad a lot better then 120x25mm fans will..

The higher cfm fans that you can comfortably run the better your cooling will be..Personally I wont use any smaller then these on a rad.86cfm Pana ..These are what I use on mine...115cfm Pana

With lower fin per inch rads Martin was getting a little better temp's with a push on the TFC rad...Fan Push vs Pull vs TFC Shroud Results

..How To: Make any Sized shroud in 2 minutes

..How To: Build A Performance Shroud

Here are a couple of the ways I ran my dual DDC's...

Ultrasonic2 (muffy) · 08-17-08

http://watercooling.co.nz/node/23

They're theoretical out puts not tested, but you get the idea

Martinm210 · 08-17-08

Yeah, theoretically parallel will be better than series on an ultra low restriction setup, but I don't think you'd ever have a setup low enough in restriction to do that. If you did, you wouldn't need the second pump anyhow and you'd probably make things worse with more pump heat.

One D5 is good for about 20 watts of heat, even a huge quad rad isn't going to offset the heat enough to make dual pumps a net gain in most cases.

But you can always try it for the heck of it, but I'd be dollars to donuts if you check temps with one pump on and then again with two...within about 30minutes (after the radiator equalizes) you'll have the same or worse temps. Heat from the second pump usually causes more harm than the good you get from the added flow rate.

I'd suggest taking that $$ and add another radiator inline..

**ira-k** · 08-17-08

Quote:

Yeah, theoretically parallel will be better than series on an ultra low restriction setup, but I don't think you'd ever have a setup low enough in restriction to do that. If you did, you wouldn't need the second pump anyhow and you'd probably make things worse with more pump heat.

Yeah in any actual loop testing that I've seen series always worked better...I like doing it for the redundancy, actually you can just set a bios shutdown temp to.

..I got a C or two better temp running in series, but I have a jet barb inlet that loves the high head , and I'm really over radded and fanned..

Now over-volting them I didn't get any gain at all, but it was fun to play with...Your really right, if your not wanting to do it for the redundacy you would be bertter off spending the money on something else...

Ultrasonic2 (muffy) · 08-17-08

yeah the reality is you'd always want the 655's in series they make good flow but not that great a pressure.. and if we look at the planned loop thats going to have heaps of back pressure !

**CL3P20** · 08-17-08

I used 2x MCP655 vario's @ 24v, in series for a client build that located the rads in a separate room..total, a little over 45' of tubing and still getting great temps. [props to Ira for advice on the build].

I would only suggest it again if the tubing length called for a 2nd pump..I would have just bought an Iwaki, but they were a little more $$ vs/ 2x MCP655's.

08-17-08	#6 (permalink)
Ultrasonic2 (muffy) Extreme Cooler Join Date: Jun 2007 Location: Auckland New Zealand Posts: 2,071 Rep: 130 Unique Rep: 76 Trader Rating: 1	http://watercooling.co.nz/node/23 They're theoretical out puts not tested, but you get the idea __________________ FOR SALE Universal 62mm TEC Plates for W/C or Air coolers Everything you've wanted to know about TEC's

08-17-08	#9 (permalink)
Ultrasonic2 (muffy) Extreme Cooler Join Date: Jun 2007 Location: Auckland New Zealand Posts: 2,071 Rep: 130 Unique Rep: 76 Trader Rating: 1	yeah the reality is you'd always want the 655's in series they make good flow but not that great a pressure.. and if we look at the planned loop thats going to have heaps of back pressure ! __________________ FOR SALE Universal 62mm TEC Plates for W/C or Air coolers Everything you've wanted to know about TEC's

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Can 2 MCP655 Pumps in parallel increase Head and Flowrate?

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