A P54C (Pentium 75 - 100) had lower power consumption (8 Watt TDP) compaired to current processors (Ivy Bridge 77 Watts TDP) and only needed passive cooling, which ment the cooling compounds lasted for alot longer, even the computers lasted alot longer from that era, I remember building a custom P166 with 16Mb of ram for around £650, £1950 sound alittle rich and over the top.