At 21:52 -0700 08/12/2002, Bolton Peck wrote: >Anyway, I switched the 45 MHz crystal on the 225MHz accel (45x5=225) to the >51.xx MHz crystal from the 180 MHz (51.4..x3.5) and I gained 4 MB/sec of mem >bandwidth according to gauge PRO, plus the machine feels faster too. Text >scrolling is now too fast. Its now running at 256MHz and stable even after >playing Quake and surfing all day. If I stick in a 53.2 MHz >crystal, that will >give me 266MHz :-D You know I have some 66.667MHz oscillators around,
I doubt that you can get a bus speed out of it much higher than 62 MHz, but you never know for certain until you try. If you get a chance, lift the heat sink again and read the model number off of the PPC604e. The 200 MHz Umax cards use an earlier, kind of power hungry 604e which runs rather hot. The 233 MHz cards use an XPC604e which seems to have been an early run of Motorola 604Es on a newer process technology. I don't know what was used in the Umax 225 MHz cards. If the 225 is not one of the later XPCs you may wish to track down one of the 233 MHz cards. I suspect it will have the most head room. >One question though, how do you turn off the motherboard cache? Do I have to >install a jumper, or is there software to do it? Would that be in the Umax >system CD? Install jumper J38 between the CPU slot and the DIMM slots. Jeff Walther -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/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/supermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
