1) If ever there were case designs with heat dissipation problems, the Cube and the 8500 would be near the top of the list. There are, nonetheless, 1 GHz upgrades for both and heat is not a frequently reported problem for those problems. (Drawing too much power for the Cube's power controller board was the undisputed king, there.)
2) The G4 is a more efficiently designed chip and produces less heat, cycle for cycle, than a G3 of the same speed. Significant operating temperature advances have been made since the G3s the B&W was designed for were released. 3) The fan in the B&W is variable-speed, based on readings from inside the case. 4) The 550 MHz limitation is exclusively a clocking issue. Macs that use processor daughtercards set the clock speed on the card, not the logic board. By hacking the card design, Sonnet, PowerLogix and (almost) XLR8 were able to run the processors up to 1 GHz. (Their next trick may be DP cards.) Both PowerLogix and Sonnet are working on ZIF module hacks to get around logic board clocking limitations. On Sunday, December 8, 2002, at 08:56 AM, Albert W D'Amanda wrote: > If I may add another thought here. > > How about heat dissipation considerations as a limiting factor ? > > On my B&W, V1 heat sink, the stock 350 ZIF CPU temperature ran around > 32C with 22C ambient( see BTW 2, below) > > When I upgraded to the G4 500 ZIF , and even changed to the larger V2 > heatsink, the CPU ran around 43C. > > With a 1 GHz ZIF, Who knows what the CPU temp. would increase too - > !!!!!(?). > > Maybe the internal B&W fan , as now designed, would not remove enough > heat from the box , resulting in degrading if not destroying the ZIF > (?) > > BTW 1. I mounted a small axial fan on top of my heatsink, in the > sucking air out direction (up) , and the ZIF now runs around 38C > > BTW2. Measuring temperature using a Radio Shack Temperature Assembly > with its temperature probe contacting the center, flat part of the heat > sink. -- G-List is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- We have Apple Refurbished Monitors in stock! | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> G-List list info: <http://lowendmac.com/lists/g-list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/g-list%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
