Help with older CPU heatsink choice

[cipher7]

I have an older system which I'm finally getting around to silencing and the last item I need to silence is my P3 1.2Ghz Tualatin. I'm looking to remove the stock heatsink/fan and replace it with a fanless heatsink, using indirect airflow via a quiet case fan.

I can't find any SLK-800, SLK-900 heatsinks but I've found the following three affordable heatsinks and was wondering which one would be the best for this CPU:

Zalman CNPS6000-AlCu

Zalman CNPS6000-Cu

Thermalright SLK-700

Thanks in advance

[Operandi]

I recently re-built a Duron 1.0GHZ that runs passively with a Zalman3100Cu (a smaller version of the CNSP-6xxx series).

Of course the case was a Lian Li PC-A05 which places a 120mm fan (Yate Loon in this case) directly in line with the CPU HS/F so if your air flow situation is less passive may not be viable.

[aztec]

I don't think you can go wrong with any of the choices you've made.

However, I would go for the Thermalright for its outright simplicity compared to the Zalmans.

Performance won't differ *too* much from any of the 3.

[Operandi]

All three would certainly work but the Thermalright would not be a good choice from a sound perspective.

The TMD fan used is not at all quiet and the densely packed fins do not lend them self well to low noise/CFM cooling.