As far as the CPU fan goes, you can get convertors that will plug from the processor fan to the 4 pin power sockets that come from the main power supply unit. All pentium II processors were the slot 1 type (like the second ebay item). So if you do indeed have a PII processor (and your mainboard can support it) I would look at the second one. The first ebay item is a socket PIII processor. The smallest (Mhz wise) slot 1 PIII was the same as the biggest PII processor ie 450 MHz. I think you need a BX chipset on your mainboard to support both PII and PII chips.