An unnamed correspondent writes: "It turns out that, for the Pentium 4, we're all going to need to buy a new case and power supply. The standard heatsink will weigh 450g (about 1 pound) and will therefore need four supports below the CPU, supports that require a new motherboard tray. Also, the Pentium 4 will need a new power supply with a new four-connector plug. This means that, if you want a Pentium 4, your old case and power supply will have to go. :( SE has more on it in their IDF Report." A little like AT / ATX and all the cousins; it's not that surprising that something has to give, but a shame that some of today's very nice cases will have to be tossed or modified to fit the P4.