my photos were way too large. here is an album of bench scores:
https://imgur.com/gallery/tjHh5dnhere is the testing:
https://imgur.com/gallery/VsEbYJjthought i would add some to this. G4 b board.
my single 800mhz cpu overclocked to 1ghz - default voltage of 1.85 and this boosted to 1.9 to reach. 475 geek bench score
https://i.imgur.com/bhFSetB.jpegi then swapped in a dual 1 - tested this factory at 861.
https://i.imgur.com/jlkJdCF.jpegstand alone i can get this to boot and start running benchmarks at 1.2 but no post higher than this. lost the silicon lottery here i think but im wondering. i have some single cpu boards that clock to 1.25, its the same chip. so maybe i desolder the 7455 cpu on the boards that require the least power at that frequency and ball them onto this dual board - see if i can go higher then? i have not put a scope on this yet, i want to see just how much jitter or droop im getting in power delivery across everything. it could be as simple as a power stabilization issue. the tech sheet lists 1.87v max for these 7455's so apple runs them hot anyway.
many people say they can only get 1 step up on these cpu's so thats what i did. 1.07ghz at 909
https://i.imgur.com/0IZ1Uk5.jpegi stepped things back - 150mhz bus now
https://i.imgur.com/Q5VhexT.jpegdual 1ghz ƒ 150bus = 1.12Ghz 968
https://i.imgur.com/L8G2adN.jpegi then booted into 10.4 instead of 10.5 and reran this one test. 951 so 10.4.12 is SLOWER than 10.5.8
https://i.imgur.com/GNVuOoe.jpegnext i will install sorbet and try that.
there was and is an issue with the higher bus speeds. to run 1.12 i am at 2v, so that is lots of thermal. 1.95 may be enough for stability, ill have to try that still BUT i kept at 2 as i was and am trying to push for 1.25ghz.
thermals are an issue for stability - the CPU sink gets hot but thats not the issue. the FSB clock controller is 11.5C higher at 150mhz vs 133 capping out at around 62C under bench testing.
on the CPU daughter card however the power fets under the heatsink in the corner of the board get HOT. clearing 95C before hard lock. there is not nearly enough air on them
![](http://macos9lives.com/smforum/index.php?PHPSESSID=8d81067eb53a881e0f28133c15bb0944&action=dlattach;topic=6079.0;attach=13192;image)
the inductors get much warmer too. 19c hotter
https://i.imgur.com/AhBm51H.png10 minutes after shutdown
https://i.imgur.com/SugXMPB.pngi added a large fan to blow under the heatsink and temps became stable.
https://i.imgur.com/h9m1hdk.pngi will need to work out a cooling solution here, tbd. i am trying to keep everything period correct.
my next challenge will be teh X800 radeon but ill post that elseware.