Is a D5 (MCP655) really better than a DDC (MCP355)?

Avathar77

Avathar77

Avathar77

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I have an 18W DDC-1T plus with an EK X-Top V2, and was wondering about changing it to a D5 with a top.
But from all the reviews I have read and from "Martins pump and RAD optimizer" I could not see how a D5 can be so much better than a 18W DDC with an aftermarket top! :confused:

When I put my components in to the excel sheet(martinspumpandradoptimizerv601.xlsx) and compare the figures, I get lower flow with a D5 in setting #5 than with a DDC! :confused::confused:


With all the components constant(almost same as what is in my Main PC right now), it is showing as having 1.21GMP for DDC 18W and just 1 GPM for the D5 at setting 5!

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Has any one actually compared the two pumps with measured figures for Flow and temps and may be noise?
I know the above excel sheet can only be used as a guide.

But if D5 has no "real" benefit over a 18W DDC, is it justifiable going for a D5(in terms of flow)?:confused::confused::confused:
 
The 18W DDC provides more head/flow with an aftermarket top. But the D5 will provide sufficient flow that it doesn't impact temperatures, whilst being quieter than the DDC.
 
Not used a DDC but my res has 2xD5 installed and I can vouch for them being silent but I also run them on setting 1. Cranking upto anything above setting 3 there is noise but not much at all (no more than a typical fan).

Setting 5 does improve temps a few degrees with the increased flow, but on setting 1 my 2500k doesn't go beyond 50c~ after several hours of prime testing (modest 4.2ghz overclock).
 
The main reason i'd buy and recommend the D5 over the DDC is silence, it does ofcourse depend how sensitive you are to sound though
 
in fairness, a well isolated 18W ddc with decent decoupling will operate on the same sort of sound level as any of the D5 variants

I used to run two 10w modded to 18w ddcs in series and they were very quiet. it took a lot of effort to remove all of the vibrations and retain good airflow over them but they did work very well.

flow rate was epic with the EK tops.

my D5 is quieter by a little margin but I am not mega keen on the top I use for it. the bitspower V2 top is very much fashion over function.
 
Deceptor said:
Not used a DDC but my res has 2xD5 installed and I can vouch for them being silent but I also run them on setting 1. Cranking upto anything above setting 3 there is noise but not much at all (no more than a typical fan).

Setting 5 does improve temps a few degrees with the increased flow, but on setting 1 my 2500k doesn't go beyond 50c~ after several hours of prime testing (modest 4.2ghz overclock).
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what voltage are you running and what Water cooled set up? 50 seems pretty high for such a small OC
 
TwsT said:
what voltage are you running and what Water cooled set up? 50 seems pretty high for such a small OC
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I managed to get the vcore down to 1.250 V, any less and I would get a BSOD after several hours of punishment, I know the CPU itself isn't the best as the i5 I have in at the moment won't even run my memory at 1600Mhz without crashing, but my other i5 which my better half nabbed did run my memory fine. WC setup is dual res/pumps (as mentioned above) with EK HT cpu block and 360 rad and 240 rad (I know it's super overkill, more blocks are pending :p). Oh and typical G1/4 fittings and tubing.

I should mention this is with the rad fans on the lowest setting too (AP-15s). Just push configs.

If 50c after several hours of prime seems high then I'm all for suggestions, running idle or general usage my temps hover around 18-22c.
 
Running 2 d5's on speed 2 with ek xtop v2's, near inaudible. I would recommend the d5 to anyone but I have never tried a ddc though.
 
Used both - did some sound vs flowrate testing many moons ago.
D5 is quieter and v.good as stock, tops offer G1/4 threads and small stats boost.

DDC gives higher flow and head, aftermarket tops make massive improvements
Excells on loops with multipul blocks

Both are over priced but usually last in excess of 4 years without issue

If you have one, no point changing to the other unless your massively changing loop.
 
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Sorry, this is going off on a bit of a tangent, but what's the benefit of running 2 pumps in series? Do you have a reservoir between them?

I've currently got a Swiftech MCP35X, which I thought was supposed to be an improved MCP355 (DDC) pump. Not sure I'd bother with it again, so I have been wondering if I should get a D5 or DDC (10w or 18w) if/when I replace it. I find it pretty noisy once it gets past 2500rpm, but I've not really done anything to silence it. Not sure what I can do as it's fitted to an XSPC dual-bay res.

How much difference is there between a 10w and 18w DDC?
 
I assume 2 pumps in series will give more flow? (but not 2X)
Also decoupling the pump and isolating from the case will reduce the vibrations and noise!
 
twist3d0n3 said:
increases head pressure i thought, not flow?
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Increasing pressure increases flow. Martin over at Martin's Liquid Lab done tests and adding a second pump of the same type doubled head pretty much and as a result increased flow by about 30% (since pump head/flow curves aren't linear). Since a D5 already will give you enough flow, adding a second one in series doesn't give much of a cooling performance increase. The only real benefit is redundancy if you're worried about a pump dieing on you.
 
funnily enough, i re-piped my setup today; went from dual loop (5970, 5870 + vrm/nb/sb x58 -> thermochill 120.3 and ram + cpu -> thermo 120.3) to all in one with the 2 d5's in series, but i dropped the 5870, and it've shaved off a HUGE temp. the bubbles whipped out of the loop a lot quicker too, considering it's both loops in one. well chuffed!

yeah, i'd assume it'd increase flow a bit, but moreso head pressure (thus getting through restrictive blocks better, like my kryos).
 
My 18w DDC is quieter than my fans which are running almost silent themselves, but if they are not de-coupled properly they can resonate quite a bit of noise onto the case.
 
twist3d0n3 said:
funnily enough, i re-piped my setup today; went from dual loop (5970, 5870 + vrm/nb/sb x58 -> thermochill 120.3 and ram + cpu -> thermo 120.3) to all in one with the 2 d5's in series, but i dropped the 5870, and it've shaved off a HUGE temp. the bubbles whipped out of the loop a lot quicker too, considering it's both loops in one. well chuffed!
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The thing that will have made the most difference is that you've now got both radiators cooling all your components - you rarely have everything at 100% at the same time, so you might as well use that other radiator to cool what would have been in the other loop to it.
 
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