I'm wondering out of curiosity if anyone has a G4-upgraded Lombard PowerBook. I recently bought a complete notebook(it cost me a pretty penny) that came with a PowerLogix "Blue Chip" 500mhz G4 already installed. That was the sole reason why I bought the computer, as it was the first Lombard G4 upgrade I've seen. I'm aware of Pismo upgrades, and have one myself. My concern, however, is over the ability for the Lombard to handle the heat of a G4 that fast. The Pismo has a nice heatsink set-up that clamps to the CPU die and runs a heat pipe over to the fan in the side. The Lombard-like the predecessor Wallstreet series and the Clamshells-uses the sheet metal cover over the processor card and a lot of the other stuff under the top part of the keyboard as the only heatsink. A big wad of thermal padding transmits heat. My computer seems to run VERY hot. As is widely known. G4 clock-for-clock run hotter than G3s, and this processor is faster than any stock Lombard processor. As far as I know, it's also the fastest Lombard upgrade offered. I would assume that the makers would have thought this out, but mine is getting hot enough to sometimes cause problems. I've been messing with OS installs, and sometimes I will get a hard lock-up either during OS X booting or in OS 9 after I've been messing with OS X. I calling it a hard lock-up because the cursor won't move-something that strikes me as thermal shut-down. The metal plate over the heatsink gets plenty hot enough to be uncomfortable to touch, and I can't see that even running the fan full blast changes the temperatures. Has anyone else played with these, and if so have run into thermal issues?