would this keep it cool?

[killer_teddy]

http://www.thinkgeek.com/computing/casemods/5a94/

How well would this actually work on an XP2100?

[Bovon]

I donno...it looks to me like it was designed to appeal to someones fancy rather than its ability to cool down an AMD BARBQ grill.

Personally, I would look for some heatsink shoot outs first.

[causticVapor]

It's an okay heatsink, but it wouldn't really be able to cool a 2100+ so well. Better for a PIII.

I'd recommend the following:

Swiftech MCX462+
Thermalright SLK-800
Thermalright AX-7
all with the sunon KD1208PTB2-6 (or sunon TD8038H if you're into heavy overclocking)

As for combinations:
Vantec Aeroflow
Thermal Integration TI-V77L/N, and the Arkua model

Let's see how it goes. :t

[Giblet Plus!]

The Zalmann is nice for making quiet pcs, but with an athlon, you'll need to have a fan on a bracket blowing at it.

If you're looking for performance, any of CausticVapor's suggestions will work great. :)

[causticVapor]

Don't get me wrong, the Zalman is one of the best passive-cooler socket 370 solutions to date. It will keep the CPU/heatsink junction at a few degrees above ambient where the stock intel cooler, with the fan removed, would cause the CPU to overheat.

With high-end, high-wattage CPUs, however, it fails to deliver, as air cannot be pushed down fast enough to get the heat out of the base. The most powerful fan will have trouble getting a 70-100 watt CPU under 52 degrees celsius with this heatsink.

The aluminum one is great for passively cooling PPGA celerons, the hybrid AlCu is good for lower-speed coppermines, the copper one can effectively cool coppermines and tualatins, and the gold-plated one is a complete waste of money.

For that "barbeque" Athlon, however, take one of my suggestions listed formerly. Thx Giblet! :t