Why does one outlet provide less restriction?

[afrost]

In the review for the TDX the reviewer said that one outlet on the waterblock provides less restriction than two outlets on the RBX.....can someone explain that to me? I would think it is the opposite. :shrug:

[AngryAlpaca]

No review that I read said that. JoeC's nor pHaestus' did, and I'm not dignifying the other review with a look. It's got less restriction DESPITE having only one outlet. Two outlets will reduce restriction with the RBX or WW design, but not with this one.

[SysCrusher]

Look at the size of the water path in the block. Then the larger ID barbs. The other thing I forgot to look at is the jet plates. Was the TDX tested with the same jet plate as the RBX? Of course, that is of no concern when compared to the WWW though.

[pHaestus]

The internal area of the TDX is much more open than the RBX (except for that die area which is identical) and there is no 1/2" Y splitter (ID really closer to 3/8). The new barbs DD is using on the TDX help too.

[AngryAlpaca]

So you don't think it's more related to the jet plate size?

[pHaestus]

I assume you are talking about JoeC's test? The nozzle size made the TDX look more restrictive than it is if you use same nozzle on both.

[SysCrusher]

This is JoeC's test.

                            c/w   psi   inch/h20
Danger Den RBX #1 Plate     0.13  0.59  16.3 
Danger Den TDX #4 Plate     0.14  0.51  14.1

The only thing I seen in pHaestus' test was the GPM comparison where the TDX was a higher GPM. How the channels sit over the die wouldn't make a difference if any unless the cpu die it self is longer than the total width of the channels. That I don't know since I never measured the channel width versus the cpu die.

[afrost]

Originally Posted by AngryAlpaca

No review that I read said that. JoeC's nor pHaestus' did, and I'm not dignifying the other review with a look. It's got less restriction DESPITE having only one outlet. Two outlets will reduce restriction with the RBX or WW design, but not with this one.

"The combination of these barbs and a single outlet means that the flow resistance of the TDX should definitely be less than the RBX. "

This sentance in the Procooling review on the front page implies that both the type of barb and the single outlet contribute to less resistance. This doesn't make sense to me, and it seems like others agree that if everything were the same in two blocks, two outlets would be less restrictive than one outlet.

Just wanted to clarify because I didn't understand it.

Also FYI the RBX that I got last week seems to have the same HF barbs on it.....so maybe they started using those barbs on both blocks. Mine look like the barb on the left pictured in the review.

[pHaestus]

Afrost the 2 barbs are possibly (depending upon internal layout) less restrictive than one UNTIL you rejoin those outlets with a 1/2" OD Y adapter. At that point you just added more restriction than the 3rd barb got ya.

[afrost]

ok, that makes sense. thanks

[SysCrusher]

Originally Posted by pHaestus

Afrost the 2 barbs are possibly (depending upon internal layout) less restrictive than one UNTIL you rejoin those outlets with a 1/2" OD Y adapter. At that point you just added more restriction than the 3rd barb got ya.

Wouldn't it be about the same as one outlet once their rejoined with a wye? Maybe a bit more factoring in the extra tubing? Reason why I ditched the wye.