this_barb

I'm wondering if you could get a good radiator and run it passive and still maintain good temps

DaGuv

I can run my XSPC 120.3 with the fans off. My Opteron will run quiet happilly at 2.8Ghz for hours in BF2 or CS:S. My ex-intel 560 would run with no fans @ 4.3Ghz but the water got very warm.

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Burn

I can do it with my heatercore, but after a while, the radiator does get very warm. I see idle temps around 47C, still rising when I turned the fans back on. You could probably run 2 heatercores passively, with the thing laid horizontally so air is able to pass through via convection, but I would put at least a low-flowing fan on there for active cooling. Even a slow, quiet 80mm fan might do the trick.

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bobcool

If i don't have the fans on my comp crashes in serconds, go figure.

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this_barb

The reason is, I want to put 2 rads into my loop, a single pass BIX III on the outside, running passive and a single pass BIX on the inside with a Panaflo or something similar. Fans on the outside of the case sound exponentially louder than fans on the inside. Would this work? I would have a total of 2 radiators (and I'm hoping I can fit a BIX II instead of a normal BIX in the case.)

Goldenpi

My XP2800+ could be cooled comfortably by a dual-120 heatercore without fans. But that was before I put the GPU block in, I dont know how it would handle now.

You can also get radiators and reservoirs designed for passive cooling, like the famous (ie expensive) Zalman Reservator or one of these interesting things: http://www.watercoolingshop.com/cata...b101ff5009b998

this_barb

Well those are reservoirs, I was thinking of using a fillport instead. Anyway, FrozenCPU has actual passive radiators that you use in conjunction with an active rad. I would imagine that they have really low resistance to flow.