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

powermac g4 CPU Upgrades

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MacTron:

--- Quote from: supernova777 on November 21, 2013, 12:39:39 PM ---
yeah u would think they dropped the L3 cache because they noticed that it wasnt making that much of a difference..

--- End quote ---

I don't know for sure, but removing L3 cach

supernova777:
http://www.everymac.com/upgrade_cards/sonnettech/encore_g4/encore_st_g4_1.2.html

i have an opportunity to grab this for 30$ and the bonus is it comes inside a whole new sawtooth hehehe
its got 256kb / 2mb cache so it should def be a huge improvement over 450mhz with 0kb L2 /1mb L3

 ;D

heres the list of other sonnet chips that were made:
http://www.everymac.com/upgrade_cards/sonnettech/

MacTron:

--- Quote from: DieHard on November 20, 2013, 11:31:45 PM ---Wow... I never noticed the "color" ring theory... I will look at all my MDDs (5 total) to check that out...

--- End quote ---
Well, I'm not sure... but I have overclocked three single 1.25 CPU's, two of them achieve easily 1.5 Ghz and have both "gray ring" and the other one only hardly achieve 1.42 Ghz and have the "beige ring".
May be casual, but I think that the ring color has something to do with it. May be the gray ones were better series...
I have attached two pictures to better explain what grey and beige rings mean.

DieHard:

I could be wrong, but I think your "Gray ring" version is simple a sloppy Arctic Silver job by Apple (or done later)... the beige ring is probably how they all looked at one time

I have personally seen this on many g4s and it is actually a real problem since the over application of Arctic Silver (which is conductive by the way) gets under the clear coating that surrounds the CPU on the daughter board and is now impossible to get out... too much conductive paste can kill the CPU if it spreads under the film to a large area... so the rule of thumb is to apply a very small amount that will spread just cover the CPU and not over-flow and to use the new high-tech non-condutive versions...

See Japmacs approach here...

http://www.jcsenterprises.com/Japamacs_Page/Blog/9AE7FE0E-0CF2-4A7C-8003-489B282582BC.html

MacTron:

--- Quote from: DieHard on November 25, 2013, 08:36:17 PM ---
I could be wrong, but I think your "Gray ring" version is simple a sloppy Arctic Silver job by Apple (or done later)... the beige ring is probably how they all looked at one time

I have personally seen this on many g4s and it is actually a real problem since the over application of Arctic Silver (which is conductive by the way) gets under the clear coating that surrounds the CPU on the daughter board and is now impossible to get out... too much conductive paste can kill the CPU if it spreads under the film to a large area... so the rule of thumb is to apply a very small amount that will spread just cover the CPU and not over-flow and to use the new high-tech non-condutive versions...

See Japmacs approach here...

http://www.jcsenterprises.com/Japamacs_Page/Blog/9AE7FE0E-0CF2-4A7C-8003-489B282582BC.html

--- End quote ---

The ring color remains after a careful thermal compound removal, even in those areas and below capacitors protected with transparent plastic.
I will attach a better picture when I can.

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