Or: 'Who says you can't hack Mac hardware??!!' Hi all
I have been busily overclocking my Umax J700, and have achieved good results so far. I have socketed the clock crystal on the 185MHz as well as the 225MHz PPC 604e accelerators I have for this machine. I also installed a big fan and a copper plate between the CPU and the heatsink. Socketing the crystal requires a special hole be made in the heatsink plate to match it, as the socket raises it up too high to clear the heatsink plate. I took lots of pictures however I don't yet have a USB card for this machine. I'll have to turn on the WIntel box :-( to get the pictures out of the camera, onto floppy and into the Mac and Freehand/Dreamweaver. Funny how even tho the Wintel box is way faster (PC2100 RAM @2-2-2; 1.1GHz Duron, KT3Ultra mobo etc.) the Mac is more fun to use. I do wish it multitasked as well as my Amigas did, but then again I always wished the Amigas could play a shockwave flash movie... Anyway, I have never used either of those programs I mentioned. I got them all, still shrinkwrapped, as a trade for some car work, and they were a main reason for getting into the Mac-they're expensive for the PC as well! So I have some learing to do.. 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, maybe I should stick one of those in and see if it boots ;-D What's that I smell?? Seriously, 54MHz will give me 270 and thats as far as the CPU is likely to go without going to Peltier cooling. I will say that the computer doesn't seem to really care too much how fast the bus is. 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? Thanks Bolton -- 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
