1u server: Dual Athlon or Dual P3?

I'm trying to decide between dual Athlon or dual P3 1u server with IDE RAID. Here's what I figured so far and I need your help to make the final decision:

Dual Athlon pros: faster than P3s, cheaper than P3s, motherboard supports faster DDR memory;
Dual Athlon cons: higher power consumtion (needs more fans, more powerful power supply --> cost increase), no motherboards with integrated IDE RAID support available, motherboards are more expensive;

Dual P3 pros: cheaper motherboards with integrated IDE RAID support, lower power consumption;
Dual P3 cons: slower than Athlons, more expensive than Athlons, only PC133 memory support;

Did I miss anything?

 

 

 

 

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