Pumps - Need fast reply...

[Diablo]

I've went through a bunch of other threads, and still don't know which pump to get, so please help. Need to order it tomorrow!

*Need to cool all: cpu, gpu, and chipset.
*I now have: Intel 3.0C@3.9 / Abit IC7 / 1GB Corsair XMS DDR500 / Sapphire 9800Pro @(425/770) 256DDR + ZM80D-HP / Enermax 480W / Thermalright SP-94
*Will use huge car heater for radiator.
*Will use 1/2" pipes so pump must have 1/2" barbs
*Have BigTower case and pump will be inside (like everything else)
*MUST BE 12V DC!!!

Should I get:
-Swiftec MCP650
-PolarFLO TT Series Pump
-some Eheim model
-MCP600
-AquaXtreme 50Z-DC12
-OR SOME OTHER...??????

I kind of like the specs of MCP650.

Please help. Has to be reliable, "powerwul" pump, for EXTREME OC!!!

Thank you!!!

[lolito_fr]

Are you concerned about noise and what is your budget?

-MCP650/PolarFLO TT is same thing (but different bling factor) and may be found to be noisy
-Eheim may be on the weak side unless you are prepared to run 2 in series?
-AquaXtreme 50Z-DC12 looks like your best bet, although reliability may be questionable? considering that Swiftech stopped selling the MCP600 which is the same model.

-Also Iwaki if you have a deep enough pocket (not sure of model number)

[Diablo]

Thanx lolito!
Noise comes last. I'm more interested in performance, power, reliability, durability.
As you can see I will be cooling lots of stuff.

Budget, well let's say about $120-$150 (but only if it will make a difference, noticeable difference). I don't want to save on such an important piece of hw.

Some more suggestions? Which 12v dc Iwaki and for how much (in USA)?

[lolito_fr]

Iwaki RD30 is 24v, sorry!
Also Polarflo TT has an aluminium pump housing, which is bad from a reliability perspective.
MCP650 looks like your best bet

[Diablo]

For now, mcp650 then.
Also, on other forums they gove advantage to AquaXtreme 50Z-DC12 (700 l/h) over mcp650 (1200l/h) !?
Does that make a difference at all, how much l/h it pushes?

[nikhsub1]

IMO the 650 is more reliable than the 50Z, but the 50z is quieter. They will both perform about the same, edge going to the 50z, but again, for me reliability is extremely important which would have me suggest the 650 over the 50z.

[Diablo]

thanx!
mcp650 it is for now...
Is Laing D4 the same as the mcp650? I'm so confused about all this... one pump being the same as some other...
what about putting 2x 50Z (or 2x mcp650) in series? would that achieve anything?

[Jimbo Mahoney]

What's the lifetime / reliability issue of the 50Z?

I've got two of them coming (series) in the post soon!

[nikhsub1]

Originally Posted by Jimbo Mahoney

What's the lifetime / reliability issue of the 50Z?

I've got two of them coming (series) in the post soon!

The newer ones are better than the early MCP600 rev1's... however, I still hear every now and again of an issue with them, startup problems mostly, think it is something in the electronics.

[pHaestus]

ALL of the 50Z are the newest revision pumps. The only pumps affected by design problems are the original batches of Swiftech MCP600 pumps.

[Diablo]

I don't understand something here:

1) How can you get more flow with serial connection of pumps? Doesn't it need to be parallel?
2) I've also heard that If you want one pump to act as a backup (if the other fails) you should also put both in serial. So how can the other working pump be a backup if water cannot go through the first one? Shouldn't it also be parallel?

[Etacovda]

Try blowing through a pump; They're not a complete restriction, water can still flow through them when they're not running.

Watercooling loops have a high level of restriction; the pump will never reach its manufacturers max GPH in a loop, so adding another in series adds pressure and allows the pump to flow more.

[Incoherent]

Originally Posted by Diablo

... How can you get more flow with serial connection of pumps? Doesn't it need to be parallel?

An analogy is batteries in an electrical circuit.
In parallel you have more possible available current but the voltage is the same, so, for a given circuit resistance the current flow does not change.
In series the voltage is doubled, for the same circuit current is doubled.

Substitute Head/pressure for voltage, Flow for current and restrictivity for resistance. Add battery internal resistance, temperature coefficients etc and you can make the analogy rather accurate.

Except the PQ curve does not behave like the VI relationship. More like V-P...

[Diablo]

@Etacovda, Incoherent: I understand now.
Thank you all!!! I have now what I need.