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relapse808
I was thinking if you could get some small thin copper heat spreads and some thermal compound/epoxy and put it on the processors of the Z if it would increase stability for overclocking??
bam
question is: is there enough room to do that?
Da_Blitz
i thoght about doing that to my Z but really cant see the point why i would need the extra power, if i do i can always just zap it to my home PC and process it there

i guess it should work but i personally use and recomend water cooling!!!, its nice and quite
adf
QUOTE(Da_Blitz @ Sep 6 2006, 11:38 AM)
i thoght about doing that to my Z but really cant see the point why i would need the extra power, if i do i can always just zap it to my home PC and process it there

i guess it should work but i personally use and recomend water cooling!!!, its nice and quite
*

...but water cooling for the Z would be soooo inconvenient smile.gif

Seriously, would a single sq cm sheet of copper foil (about what you'd end up with, i think) really change the temp enough to notice?
Da_Blitz
above 600Mhz i would say yes, it seems that at that point that the heat output gose up exponentially with the freq increses, this may be due to the V increse required to do so

to get your Z to insane speeds you would have to switch over to active (ie consumes power) cooling, may be fun but not nice on the battery

i have aleady cut up my case to add 2 usb ports, i may as well cut a bit more and give it a go, i dont expect to see much of an improvment but it will give me peice of mind

i will switch over to cacko and see what i can get it up to and apply the hack, i have to reflash OZ anyway to boot off the second CF slot (i put the usb ports where the microdrive sits)

note with the cxx00 series there should be enogh room for a small stich on heatsink as the PCB is about the thickness of a CF card from the outside, i have a nice stick on heatsink i used on my NSLU's thats just the right size and shape, if you are in australia jaycar sells them.
dproldan
I cut the metal frame that holds the RF shielding of the processor and put some thermal paste between it and the processor.
This frame has a metal circle and a cross which is intended only for providing a vacuum surface for the pick and place machine.
I will post a picture when I get home.

I'm not sure that it will do any good, but it was easy to do and gives me some peace of mind when I rise the speed.
Da_Blitz
i thoght about that but in the cxx00 there is a bit to much space between the shield and the CPU, hence why i was going to use a stick on heatsink
relapse808
I was thinking of doing it because the highest turbo you can do with the battery applet causes my C3000 to crash after 10 minutes or so. This frequency allows some pretty smooth play in almost all snes games I have tried. It would be nice for that overclock to work for 45 minutes instead.
dproldan
This is what I did, sorry for the bad quality pics.

- Cut the sides and bottom of the cross. picture1
- bend the bottom leg over the circle, so that it makes contact with the shielding later, remove the side legs.
- I put a small piece of tape over some components to avoid any chace of a shortcircuit. Picture2

- Put a bit of thermal silicone paste and closed the shielding.
Legodude522
QUOTE(relapse808 @ Sep 5 2006, 11:32 PM)
I was thinking if you could get some small thin copper heat spreads and some thermal compound/epoxy and put it on the processors of the Z if it would increase stability for overclocking??
*

I think there is room. It already got some sort of metal cover over the processor. I have noticed my Zaurus going unstable while going at 624mhz. It won't go for too long and gets a little hot.

I plan on adding a small copper block if I can fit it and see what that does. Or something thinner.
Reaper
Well, at 624CPU/312FSB almost everyone has got stability problems, but some serious investigations done by Maslovsky (author of Cacko wink.gif) shown that it is a problem with NAND chips, not with CPU itself, they just can't withstand such a frequency. And most of the faster chips are unknown to Z bootloader. I've been able to overclock my old C760 to 707 MHz without any stability issues, and that helped a lot with several video clips, Firefox speed and so on...

P.S. I suspect that passive cooling of NAND chips won't work either, they don't heat THAT much when overclocked, they just start to produce multiple errors.
Da_Blitz
you are right about the nand chips not bieng affected by cooling it, they work diffrently to a CPU and are designed diffrently.

i havent had problems at highspeeds but that might be because i dont spend much time at such high speeds and i use a c3000 with OZ which dosent touch the NAND after boot

still it seems wield that nand could affect it unless people are tampering with the bus speeds as well
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