[mikellanes]

Hey, im going to OC my cousins iMac this weekend, he has a 266 model, and if this image is correct:



than i should be able to just move the one jumper to get it to 333 and ill test that speed out, and then another jumper to get to 366.
anyone get thiers to run reliably at 366?
which chip stay cooler the copper or aluminum? i already have a bigger heat sink & a new fan that i am going to have to make work (probably move the first fan up and set the 2nd on there)

what is a good operating temperature? it usually stays about 44ºC what shoule the max be at heavy load?

Any other things I should know about?

thanks for any reply's/help!

[Number41]

Hi mikellanes,

I've been looking for some information on how to do exactly this, but have come up short. Where'd you find the jumper pictures?

which chip stay cooler the copper or aluminum?

One thing I do know is that copper runs cooler -- that was the whole point of moving to copper -- and that it uses smaller traces (either 0.18 micron for copper as compared to 0.21 micron for aluminum, or it might be 0.13 comapred to 0.18, I'm not sure). With copper, you can either run at the same clock speed as aluminum and the chip will run cooler, or esle you can go for a higher clock speed and the chip will run at the same temperature as aluminum at a lower clock speed.

Also where'd you find the new fan? What's your plan for installing it?

I'm very curious to know how this turns out, as I really would like to do this myself. Please post any results, good, bad or blown motherboard.

Inquiring minds want to know...

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Number41

[giantmike]

Yes, copper is definately cooler. My 233 MHz Al G3 ran at about 104°F normally. Now, my 500 MHz Cu G3 runs at 76°F normally!

I would be very careful trying to bring a 266 to a 366. It'll be hard enough getting to to run reliably at 333, let alone another speed bump. You cousin should be happy if you can even get it to 300 Mhz.

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The Mac Information Depot. Why go anywhere else?

[mikellanes]

ok here is what happened:

first i moved the 1 and it ran at 333 very unreliably not very hot though.
added alot of heat dispersant heat sink compound to the heat sink and stock temperature went down 4º and the 333 temperature was within range. but it was still unstable.

so we moved it back to 266, but upon re-start it was still running at 333!
so i fidex the solder again, and it was back to 266

I guess if you remove the bottom chip it runs at 333?
i wonder if maybe i didnt have it set on the solder properly for the 333....
do you think it would have run a bit better if it was set on there?
hmm...

anyway i felt like doing more so we went to 300, turned it on and sad mac :-(
so i fixed the solder and started up and got it to 300
semms to run fine and we wrapped up the day :-)

oh yeah he also had a seven dust C virus.... and that took 1/2 the day to get rid of!

oh at 300 it runs at about 40ºC to 45ºC

thanks