Blizzard PPC 603e Chip BGA or CQFP

[delshay]

im typing this with a blizzard ppc clocked at 298Mhz.

[delshay]

I'm typing this with a Mac Mini G4 clocked at 1.58GHz

does it have amiga OS,if not your not playing fair

[delshay]

WOW! I have never ever heard of someone overclocking the 603 at this speed. :shocked:
 Does MOS or OS4 run stable on your setup?

who sad anything about overclocked 603. it takes advantage  of  74.666Mhz bus for compatible reason with OS3,9,but uses OS4.0 as it main OS with 256Mb **modify** ram modules.


apart from heat issues 100% stable.

[delshay]

[/QUOTE=Jose;514546]There was an old rumour (or fact..) that some guy replaced the 603 with a G3 and it work for a few moments or something. Would be cool to do it but at the price of this boards noone's gonna try. There's an italian company that can do BGA replacements, you just have to send them the stuff. The name was ATE I think, don't know if they still do it though...
It still probably wouldn't be such a breakthrough because the memory contorler on the BlizzardPPC sucks...[/QUOTE]

only a very few will touch the blizzard ppc because of the age of the board,but even if you make a mistake dont fear.

you can buy a repair kit to fix BGA,if not try this route.

get hold of a old PCB with BGA of the same type and heat-up the pad you want to remove with sharp pointed twezers.

keep the iron on the pad lift and pull the complete track with BGA pad. now just add it to the damaged area where the old BGA pad was(remove the the old pad first if it's still there)

NOTE: you can add missing or extra signals with the above ie BVSEL.

the above is just a smart way of doing things,and don't rule out adding multi-layer under a BGA component,you just have to isolate each track(if any) as this will depend on how you remove the track from the PCB..

if adding new signals the old BGA pad (n/c) must be removed.

all above for EXPERT ONLY.

** ALL MODIFICATION AT YOUR OWN RISK**

[delshay]

my DCE BPPC had a CQFP ppc cpu, it was clocked at 200mhz, I did not overclock it or the previous owner AFAIK... it also had a real 60mhz 060... and no scsi

scsi chip is another problem when overclocking,but under testing this chip runs cool,the problem seems to be with another chip this is located under the heatsink  near tha fan hole,this needs to be comfirmed as to where the heat is coming from,as it may be due to other chips near by which make this chip run very hot (DO NOT ADD  A HEATSINK TO THIS CHIP).

if found to run very hot this will be the 2nd chip under the heatsink that needs cooling.

[delshay]

Well, the BPPC PCB was designed to house both types of CPUs. Obviously this was made so that P5/DCE could use whatever CPUs that were available at the time of board fab run (PPC CPU availability has always been quite bad).

by designing it to take both types of CPUs some signals did not get tied.

there is a lots of signals not tied this does not affect the 603 or 740 however it seems that it does affect the PPC 745 and 740L new revision. over the next three months i hope to have a 745 or 740L working provided the Blizzard card does not need a flash-update.

there`s also the problem to find PCB tracks with with correct size BGA pads in-order to fix this problem otherwise it will be done by lifting BGA pad/track off old PCBs.