Order of flow?

[vodEVIL]

Hi, I was wondering if this order will work

Pump > CPU > Res > Rad > Pump ?

Will this hurt performance at all or doesnt it make a difference?

If not just go with

Pump > Rad > CPU > Res > Pump ?

 

[HeThatKnows]

The only flow ordering that is important is that the res be right before the pump (to help avoid cavitation). Other than that, whatever is easiest.

 

[RickyJ]

The only flow ordering that is important is that the res be right before the pump (to help avoid cavitation). Other than that, whatever is easiest.

Yup. If you've planned your system right (enough flow), your temps before and after a block should differ by less than a degree (~0.2C for a decent setup?).

 

[HeThatKnows]

100 watts into a gallon per minute gives a change of a hair under 0.4° C, not something you'd notice.

 

[Cathar]

100 watts into a gallon per minute gives a change of a hair under 0.4° C, not something you'd notice.

Yes - but remember that the CPU block is doing that regardless - so what's really important here is what's raising the temperature of the water between the radiator and the CPU waterblock inlet. In the above case - the only difference is the pump. The actual difference for the CPU is more like 0.05C if you put the pump before, rather than after, the CPU block.

 

[vodEVIL]

Alright, thanks a lot guys. I have the dangerden 12v pump and from what I have read its one of the best pumps so I shouldnt really have a problem should I?

 

[HeThatKnows]

Yes - but remember that the CPU block is doing that regardless - so what's really important here is what's raising the temperature of the water between the radiator and the CPU waterblock inlet. In the above case - the only difference is the pump. The actual difference for the CPU is more like 0.05C if you put the pump before, rather than after, the CPU block.

Well obviously the pump isn't gunna dump 100 watts in the water. The point was that even the two biggest heat movers (waterblock and rad) don't change the water temp enough to worry about flow order...beyond making sure the pump has an unobstructed inlet, order's largely irrelevant.

Yeah, D4's a great pump.

 

[Cathar]

Well obviously the pump isn't gunna dump 100 watts in the water. The point was that even the two biggest heat movers (waterblock and rad) don't change the water temp enough to worry about flow order...beyond making sure the pump has an unobstructed inlet, order's largely irrelevant.

Hey, I wasn't having a go at you. I was just pointing out that the differences are even smaller than what people commonly throw about. A lot of people talk about what the CPU puts into the water, and fair enough I guess, but that's not too relevant for the order of flow question. The actual difference depends on the pump, and yeah, it's a tiny difference.

 

[HeThatKnows]

Yeah, you're speaking more to the specific orders in the first post, and I'm channelling demons from long ago threads. I just get tired of the 'well I guess its around...' and the 'its gotta be at least...' answers when simple calcs can give the boundaries.

 

[whitewale]

The only reason why order is important - the little impeller pumps used for water cooling are much better in pressure then in suction performance. So you want your pump at the lowest point, with easy flow into the pump. And that is usually achieved by having the reservoir in front of the pump, so that the static pressure of the reservoir helps with pump performance. Or by having the pump submerged in the reservoir.