Classic Mac Hardware (Troubleshooting, Upgrading, & Modifying) > Mac CPU Upgrades

MDD 866 Mods

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supernova777:
from what i have read about pc overclocking..
this is totally possible
that the cache memory cannot reach the proper speed
this is oftenthe biggest factor in overclocking
which is why pc overclockers always always want the craziest fast
ram so they can achieve higher multipler
so it makes sense that the cache ram is whats holding it back

plus.. i also read that the quicksilver 733mhz cpu is very popular for overclocking
because it lacks the cache ram entirely.. and therefore it can be overclocked to 933mhz
very easily!

https://translate.google.com/translate?sl=fr&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fsites.google.com%2Fsite%2Foverclockmac%2F&edit-text=&act=url
https://translate.google.com/translate?sl=fr&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fsites.google.com%2Fsite%2Foverclockmac%2F&edit-text=&act=url

as we can see in the attach document changing a 733 qs cpu is the only overclock for mac
that u can do by cutting a single trace to a resistor going from 733 to 800
or by moving the resistor u can make it a 867  or a 1067
to make it a 933 or 1000 u need an extra resistor from some place to add
this seems like the best option to get a 1ghz single cpu quicksilver!!

Protools5LEGuy:

--- Quote from: chrisNova777 on September 23, 2014, 03:33:24 PM ---from what i have read about pc overclocking..
this is totally possible

https://translate.google.com/translate?sl=fr&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fsites.google.com%2Fsite%2Foverclockmac%2F&edit-text=&act=url

--- End quote ---
Thanks for the link!
Someone tried too to put in order the bits article
https://translate.googleusercontent.com/translate_c?act=url&depth=1&hl=en&ie=UTF8&prev=_t&rurl=translate.google.com&sl=fr&tl=en&u=https://sites.google.com/site/overclockmac/g4mdd&usg=ALkJrhj7-0rGMVdKifn347AFqLocMO3unQ
At least I can copy that table from there...


--- Quote ---!!! Warning !!!

The presence of a resistance equivalent to a "0" in this table and the lack of resistance to "1
--- End quote ---

supernova777:
im reading here.. that its possible to take a sawtooth to  133mhz bus by openfirmware only???
am i reading right?

http://www.xlr8yourmac.com/G4ZONE/sawtooth/SawtoothCPUdesign.html

as long as u have pc133 ram..and mac os 9.1+
+ openfirmware hack
= 600mhz g4 from a 450mhz
:o

Protools5LEGuy:

--- Quote from: chrisNova777 on September 23, 2014, 03:33:24 PM ---
https://translate.google.com/translate?sl=fr&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fsites.google.com%2Fsite%2Foverclockmac%2F&edit-text=&act=url
https://translate.google.com/translate?sl=fr&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fsites.google.com%2Fsite%2Foverclockmac%2F&edit-text=&act=url

as we can see in the attach document changing a 733 qs cpu is the only overclock for mac
that u can do by cutting a single trace to a resistor going from 733 to 800
or by moving the resistor u can make it a 867  or a 1067
to make it a 933 or 1000 u need an extra resistor from some place to add
this seems like the best option to get a 1ghz single cpu quicksilver!!

--- End quote ---
Taking the MDD866 dual to 10xxMHz is just pull off two resistors too...

The QS 733 chip even overclocked to 1067 should be "slower" than a DA 733 due to the 2Mb cache...

What about to "exchange" the cache chips? It is micro tech, not nano tech.  ;D :D Any TV Service repair shop should have the electric soldering iron to desolder the cache...What is unknown is if the "new" cache would be a waste of time and money. Maybe not all cpu daugtherboard can take advantage of the chips installed. Some cpus work despite having the cache out of specs/broken

MacTron:

--- Quote from: chrisNova777 on September 23, 2014, 04:01:20 PM ---im reading here.. that its possible to take a sawtooth to  133mhz bus by openfirmware only???

--- End quote ---
no.

--- Quote ---am i reading right?

http://www.xlr8yourmac.com/G4ZONE/sawtooth/SawtoothCPUdesign.html

as long as u have pc133 ram..and mac os 9.1+
+ openfirmware hack
= 600mhz g4 from a 450mhz
:o

--- End quote ---
this CPU at 600MHz will not even boot.

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