Adding a second loop...

[BbWah]

I was planning to add a second loop for the 2 - 8800GT in SLI. Should I add the Northbridge to the CPU loop or VGA loop?

Currently the NB has a Noctua NF-R8 80mm Fan and fan adapter. Water loop order is pump > rad > cpu > vga > vga > res > pump.
*EDIT: I forget to mention I was planning to use a single 120mm or 140mm Rad for the second loop. Is this enough?


Computer
CPU: Qx6850 @4.00Ghz
RAM: Corsair 4GB@ 800 Mhz
MOBO: EVGA 780i FTW
GPU: BFG 8800GT OC SLI
PSU: Corsair HX750W PSU
HDD1: WDC Velociraptor 300 Gb
HDD2: WDC 500GB RAID1
OS: Windows 7 Ultimate

Water
RAD: Swiftech MCR320
CPU BLOCK: Swiftech Apogee GTZ
VGA BLOCK: Swiftech MCW60-R2
PUMP: Wwiftech MCP655B
RES: XSPC Dual Bay bubble window Reservoir
TUBE: Tygon 7/16"

[eponymous]

You'd be best off keeping the GPU and NB/SB/MOSFETS in the same loop as the GPU's can handle the heat better than the CPU.

[jim0ne]

Originally Posted by eponymous

You'd be best off keeping the GPU and NB/SB/MOSFETS in the same loop as the GPU's can handle the heat better than the CPU.

+1.

[BbWah]

I forget to mention I was planning to use a single 120mm or 140mm Rad for the second loop. Is this enough?

[jim0ne]

I would say a 120.2 would be better.

[eponymous]

I'm no sure a single would be enough. You can roughly calculate which radiator would be the best using:

C/W = (WaterOutTemp - AirInTemp) / HeatWattage

C/W: is effectively how much the temperature will rise above the ambient temperature for every watt put into the water in the loop. This is determined by the rad/fan combo.

Someone chime in here incase this is incorrect

Hope this helps.

[kamieldehond]

i would go for the 120.2