2 pumps with 2 radiators. Single or dual loop?

[L7R]

Buyers remorse or not, but I just ordered two pumps and Black Ice Pro III but thought if two pumps are really neccessary? I have one single (120mm) radiator already. System is 2x2900XT's, 1,86GHz C2D@3,5GHz 1.45V and NB. I thought I needed two loops. Triple rad for radeons, because those put massive heat into the loop. CPU and NB for single rad. But now I wonder did I make mistake...

1. Is that single 120mm radiator enough for CPU and NB? I sold dual rad which was enough for CPU+NB and even 8800GTS.

2. Would it be better to put all those in the same loop and combine those pumps? I'm also thinking if one MCP355 is enough to power the whole loop (360+120+CPU+NB+2x2900XT+reservoir). But now when already bought, I would like to take best out of those 2 pumps.

sorry my english.

[krusu70]

2 loops
1 for cpu and other small things.
and 1 for 2 GPU's.

[L7R]

Thank you for quick answer. I'm glad I got it right in the first place, but I just wanted to be sure.

[Big_Daddy]

Lets not jump the gun on that one.. what 120 rad? your overclocking the bejesus out of that proc, it's gonna be hot. Also, adding the north bridge is going to add some resistance. What cpu and nb blocks are you using? what pumps?

[krusu70]

ofcurse its better if the 120 rad is changed for 360 rad

[L7R]

Sorry for being out of this topic for a while. Luckily I have time to little planning, because it will take for a while when I get all of my stuff from sidewinders (from US to Finland).

Blocks are:
Apogee GT
MCW30
2x MCW60

Rads:
Black Ice Pro III
Alphacool NexXxoS Extreme 1 (rev.2) Link (http://www.alphacool.com/Radiators-heat-exchangers/NexXxoS-Xtreme-I-Rev-2--4638.html)

Pumps I ordered are 2x MCP355 12V. I also ordered 2x swiftech micro reservoirs and 10feet of Tygon R3603 7/16in. ID 11/16in. ....And heck of a lot ramsinks (32pcs) and mosfet heatsinks for those 2900XT's. Uh :)

[ArtosDracon]

Dual loop but, with a shared reservoir to help balance load between the radiators. A single loop with four blocks, two pumps and two radiators would be hell on flow and overly complicated I'm not sure on the other hand how to tie the reservoirs. Maybe just cross the inlets. That would essentially create one big loop just with the pumps at opposite sides of the loop, basically Res1-pump1-mcw60-mcw-60-360-res2-pump2-cpu-nb-120-res1???

[Lagaaja]

I'd say two loops.

Triple rad for GPUs and NB and single rad for CPU (I'm uncomfortable with the idea of single rad on OC'd CPU and NB). Are you sure you need a NB block at all?

Res (big) -> pump1 -> gpu1 -> gpu2 -> nb:confused: -> res

Res (small) -> pump2 -> cpu -> res

[L7R]

I'd say two loops.

Triple rad for GPUs and NB and single rad for CPU (I'm uncomfortable with the idea of single rad on OC'd CPU and NB). Are you sure you need a NB block at all?
Res (big) -> pump1 -> gpu1 -> gpu2 -> nb -> res
Res (small) -> pump2 -> cpu -> res
Hey, that triple rad for NB + GPU's is great idea, imho. I'm building this to lian-li V2100 case and it has inverted mobo tray and that triple rad is going to bottom, so I must use pretty long tubing anyhow.

I think a NB block is good to have because I don't want to use any fan on it. I don't actually know how hot it gets but I'm upped the voltage by 0.3V, to make system 100% stable (500MHz FSB).

@ArtosDracon
I really don't mind if one of those reservois got any use. I thought if I do singla loop I use only one. I got two because they were cheap ...and it's good to have one for back-up. :)

Any opinions if that tripple rad and MCP355 is enough for 2x MCW60 and MCW30? And thanks to everyone for great ideas!