EK-DDC Dual TOP V.2 G1/4

[SpuTnicK]

Was serfin the net and bumbed into this:

Product Description
EK-DDC Dual TOP V2
Treads:
- 2 x G1/4,
- 1 × Multioption link ready

Dimensions: 125×67×21mm

Included:
- 2 × DDC Dual holder for 5,25" BAY mount
- M4 Antivibration KIT for 5,25" BAY mount
- 4 M4x6mm screws
- 2,5mm alen key

- Weight of the packet 520g
- fittings not included

has anyone tried it lately? Looks very nice and promising too

[dejanh]

I was considering picking one up but the total lack of reviews and any test data which compares the older revision 1 of the dual top to this one makes me absolutely weary of spending $60 to get no performance benefit. Also, I find that this top seemingly has a larger footprint/less mounting options than the older version which I do not necessarily like (I have the old version mounted vertically which would in case of this top render the res link useless). Anyway, without test data comparing the old EK dual top to this one and other dual tops I would not buy this.

[Humminn55]

Well, dejanh, I'd be of another mind on this, given that EK's single block for the DDC, the Rev. 2 version, performed much better than the previous "best
single block top, the XSPC. I'd really like to think EK's history shows it to be a company that really doesn't produce junk and constantly strives to improve its products as time passes.

I would like to see a performance test, too, but the lack of them wouldn't make me wary of buying this top at all. I'm currently in the market for such a top for my pair of DDC2's and this block is tied for the one I'll purchase with the XSPC top. In my case, the fact it has a white acetal top available for it really sways me towards the EK top.....plan on doing my new loop with all the blocks using white tops, white Primochill LRT tubing, black BP barbs and black clamps.

[dejanh]

Well, dejanh, I'd be of another mind on this, given that EK's single block for the DDC, the Rev. 2 version, performed much better than the previous "best
single block top, the XSPC. I'd really like to think EK's history shows it to be a company that really doesn't produce junk and constantly strives to improve its products as time passes.

I would like to see a performance test, too, but the lack of them wouldn't make me wary of buying this top at all. I'm currently in the market for such a top for my pair of DDC2's and this block is tied for the one I'll purchase with the XSPC top. In my case, the fact it has a white acetal top available for it really sways me towards the EK top.....plan on doing my new loop with all the blocks using white tops, white Primochill LRT tubing, black BP barbs and black clamps.

I don't think you quite understand what I am talking about. I own the version 1 of this top myself and it performs just fine. For a person in my case I have no practical reason or reasonable argument to upgrade to this top from any standpoint right now. There is simply no test data or any information available on this top right now, not to mention that it is somewhat pricey and in very limited availability. Is it better than version 1? Is it better than other dual tops? There are only question marks around this top right now as there is no test data at all. Hence, if you buy this you are experimenting. In my case I will only dump the version 1 of this top if this is substantially better. As it is right now version 1 can be had for 1/2 the price, provides good performance, and is easier to integrate into tighter spaces because of more flexible mounting options. For me, I would be weary of getting this top without significantly more information. That is my $0.02. YMMV.

[Blueking]

Anyone got this top - EK-DDC Dual TOP V.2 G1/4 - Black Acetal ?

Are there any air between pumps if one want to have cables located between pumps to hide em ?

[Martinm210]

Dual tops generally have a sharp 90 degree bend at the inlet entrance to the second pump, so I doubt you can design one that would perform the same as two separated tops.

No performance or test data to confirm or deny that though..so who knows...

[Blueking]

Dual tops generally have a sharp 90 degree bend at the inlet entrance to the second pump, so I doubt you can design one that would perform the same as two separated tops.

No performance or test data to confirm or deny that though..so who knows...

what were u answring ?

[Church]

Martinm210: If pumptop would have been bent in middle in T shape (with one pump placed 90degrees relative to other) imho it's simple to make straight passthrough from one pump to other.

[Polizei]

Martinm210: If pumptop would have been bent in middle in T shape (with one pump placed 90degrees relative to other) imho it's simple to make straight passthrough from one pump to other.

I think what' he's talking about is a sharp 90° bend to angle the output of the first pump down into the inlet of the second pump.

[skinnee]

Some have become quite crafty with the bridge between the two pump heads... I'll get some pics up here in a bit, I happen to have a handfull of dual tops on the bench right now.

[Blueking]

Seems people didn't get my point...
What I were asking for was -> look at pic ->



U see cables are located in middle and I need that space between pumps when mount on ek dual top V2.
Added a temp sesor glued to coil inside pump

I do have XSPC dual top plexi version, but seems plexi didn't enjoy the glue i filled up inside of pumps and plexi shoved micro fractures where silicone has been in contact with plexi. So I look for a dual top in acetal.

So wonder if EK dual top uses same distance between pumps are are they seated close together ?

[Blueking]

Some have become quite crafty with the bridge between the two pump heads... I'll get some pics up here in a bit, I happen to have a handfull of dual tops on the bench right now.

U got EK ddc dual top V2 ?
Can u check if there are space between pumps when mounted on top ?
Have finger on ordering ek dual top just need some feedback first

[skinnee]

not screwed down tight.

[Brodholm]

not screwed down tight.

Nice! Have you had time to test any of them yet?

Good? bad? Or will you make us wait?

[Blueking]

not screwed down tight.

so u say it will go ok with mine pumps with wires ?

[skinnee]

Testing with 3.2's is almost done, thread coming.

Not certain, it is tight, but I think all six wires fit unsleeved.

[Blueking]

Testing with 3.2's is almost done, thread coming.

Not certain, it is tight, but I think all six wires fit unsleeved.

Ok should be doable then, rub down plastic 0.25 mm on both pumps so I have 0.5 mm more space to be safe

[SmugBoy]

Wondering if you can use the EK Dual DDC Block with 2x Koolance HTS-PMP400 Heat Sinks? Will they fit or does it make the base too wide?

[Martinm210]

I think what' he's talking about is a sharp 90° bend to angle the output of the first pump down into the inlet of the second pump.

Exactly, bends right before entering the pump impeller is bad. The gveneral rule of thumb is to provide at least 4x the diameter of straight tubing entering the impeller. This supposedly helps straighten the flow and allow an even loading of the impeller.

While bends are relatively insignificant in the loop, they are fairly critical right at the pump itself especially at the inlet side.

Thanks for the testing skinnee, will be nice to get some science behind how well these work. I was always skeptical compared to two separated tops, but now well know..

[Brodholm]

I was always skeptical compared to two separated tops, but now well know..

Hmm, i have a question. If you where to go 2 separate top instead of a combined is it best to have pumps in series. Meaning that you have the first tops outlet connected to the inlet of the other top. Or is it possible to have them to take water from the same res and then combine them together again? Or will that make the pumps work against each other?

Like this:

RES

/ \

Pump Pump

\ /

|

RAD

|

Blocks (cpu, gpu etc)

|

Back to Res

Edit: ohh, well. My blanks does not show when i post. But after the rad it splits to each pump and then together again.

[Martinm210]

Hmm, i have a question. If you where to go 2 separate top instead of a combined is it best to have pumps in series. Meaning that you have the first tops outlet connected to the inlet of the other top. Or is it possible to have them to take water from the same res and then combine them together again? Or will that make the pumps work against each other?

Like this:

RES

/ \

Pump Pump

\ /

|

RAD

|

Blocks (cpu, gpu etc)

|

Back to Res

Edit: ohh, well. My blanks does not show when i post. But after the rad it splits to each pump and then together again.

That's parallel and only works well with extremely low restriction and darn near impossible to make better than series with commomn wc parts. Series should be better for any normal to high restriction system.

Series will usually net something like a 30% gain in flow rate, parallel would probably be closer to 5% as a guess. However, series has the benefit of providing pump redundancy..one fails you're still ok. Don't expect to see huge temp gains either way though. Check ou Vapors block database and you can compare it that way.

[Martinm210]

Vapors database, medium/high is one pump, high is two DDCs in series..usually worth less than one degree so its not really something that going to net you anything regarding overclock.
http://www.xtremesystems.org/forums/...d.php?t=254900

[Martinm210]

Also note that Vapors .6 to .7c gain is under testing with a larger than normal radiator setup(two mcr320s for the cpu). With a smaller rad setup, the extra pump heat dump eats away at that already small gain...very possible that it completly degates any gain at all. For me this means duallpumps really should only be done if you want redundancy, you want show, and should only go with an already extreme radiator setup to help offset the heat dump added by the second pump.

[skinnee]

But the extra heat dump is what... 10w maybe for the extra ddc?

[Martinm210]

But the extra heat dump is what... 10w maybe for the extra ddc?

I think its probably closer to 15-17 watts on the ddc as a guess especially in series were you are pushing the pump far right on the curve. BTW, you can test for heat dump using a large insulated reservoir...use the specific heat of water and circulate a simple pump/res loop over time and log temps. It works..tried it on a smaller pump once..would be cool to see it on tbhe ddc. I think the ddc/D5 are probably something like 90% of consumed or something high like that.

Now take that 17 watts and follow it up the green line on a more typical double rad setup.


That extra ddc could fairly easily cost you a .5c-1c gain in water deltas at lower to medium fan speeds. That's pretty consistent with my limited testing in the past. I ran one D5 on my supreme loop...turned on a second D5 and initially saw a 1c improvment...but after about 5 minutes the rad equalized and climbed back up that degree I gained.

17 watts is small, but so is the thermal gain from the second pump. You might gain .7c from extra flow rate yet you could easily loose some or all of that from just that one pumps added heat load..really depends on the fan/rad combo but definately something you shouldn't ignore...surprising it adds up that way though.

Anyhow, not to put down having fun with cool parts, we all like that...just that the real benefit I see is redundancy. Pump failure can be catastrophic without failsafes and an extra pump is one more layer of insurance.