2 water loops question

[Thrust]

Originally had 2 water loops

1) CPU + Southbridge
2) 2 GPU's + Northbridge + Voltage regulators

got 2 GTX 260's and decided not to water cool them. Reconfigured the loops to be :

1)CPU
2)Northbridge + Voltage regulators + Southbridge

Discovered due to Southbridge water block, I am forced to take the stock cooler off in order for the Vcard to even fit!

So now I'm wondering: I really like the CPU being on it's own loop, but I'm afraid 2 GPU's, NB, SB & VR on one loop is just too much. Is it? I'm using a Chevette heater core that has exact same surface area as the (4) 80mm fans on it. If you think all that is too much for one loop, what is the coolest device I should put onto the CPU loop?

I'm guessing either VR's or SB or both. Thanks in advance

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[BillParrish]

In order of heat produced under gaming load I would guess the order would be.

GPU aprox 182 W (GPU chip is rated 182W TDP by Nvidia) add some if OCed.
GPU ""
CPU aprox 130 W (Intel TDP - not OCed) add 40W if high OC 30W medium 20W minor - all ballpark.
VR assume same as CPU. little less maybe, depends on device effeciency and we cannot know.
NB 40W -60W - guess based on knowledge of other data sheets.
SB. 15W - guess based on knowledge of other data sheets.

Little confused, you mention only one rad but two loops. But without doubt the SB produces the least heat.

For verification you can try to find the datasheets for your chipset on Nvidia.com in the Electrical Characteristics section it should mention the power used/rated.