Overclocking Tests on G3 CPUs:

A reader sends notes on the results of overclocking tests on a series of Apple G3/ZIF CPUs:

" i have put 15 different g3's in my socket, a rev 1 233 mt. I keep thinking that i will get to the cooling review, but i seem to have lost my quicktake cable, do you know where to get one (the serial type) if i find one i will send you all the photos that i have taken.

anyway, the ibm and motorola chips have mostly the same numbers on them from 233 or 266 machines, the 300 is obviously different. the ibms are MUCH faster and cooler (10-20c). i have been able to get most chips to 280mhz, but many of the motorolas get very hot, probably wont run without a fan., most ibms with dates in 98 can run at 292 and some at 315, got one to run at 332, these are all from 233 and 266 machines.

the 300 runs great at 350, did a partial boot at 368, at 350 it is fast, and stable. macbench disk scores (writes and reads)went up 15%-70% from the same setup but at 315 with 512l2cache. didnt think the 350 would be that much faster.

i can get a small number of the new genuine apple 300 1 meg lc cpus for $450 with your 233 trade in. they all have run at 350, and 36c with fan and compound. can run all the time in a desktop.

mostly need to remove the stock ram, it cant crank the speeds we needs, pc sdram works fine.10ns

macbench:
g3 mt, rage pro 8 meg card, 96 ram, 8.1, normal extensions, no libmoto, no speed doubler, miles wide, 2x2.2 gig viking with stripped softraid, 2096 disk cache.

speed	cpu	fpu	disk	pubdisk
280mhz	925	702	530	486
300mhz	1000	753	604	496
350mhz	1220	877	603	518

ps. this smokes my 9600 400. [Note: In real Apps tests my 9600/400 was as fast or faster than a Apple G3/333/222. See my Mach 5 Page for results-Mike]

john m
i;ll have about 20 cpus to sell soon! "

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