What is the right 1G RAM upgrade for Aluminium G4 1,25 GHzPowerBook ?

Question

After 6 months of struggle I am ready to throw my PB into trash bin and a buy a powerPC that works.
I tried to upgrade RAM from 1G to 1,5G - the older RAMs being 2x512MB Kingston copies and working well but getting slow for multitasking (photo editing and other jobs). I understand this is possible, but I am no longer convinced.
Ordered an Apple original from retailer getting first a RAM that did not work at all, the PB not starting, and thought this is due to bus slewing phenomenon.
Contacted the importer and they sent me another one that should work, this being a PC2700U-2533 DDR Sodimm 1GB by Daimler.
Now the PB starts and I can even get it working for upto 1 min or 2 max, then it freezes. No difference whether the RAM is on the lower or upper slot, and if I put the 1G RAM alone to any of the slots, the computer freezes at startup already.
Is this now due to CPU speed that is too low, as obviously the buffering does not work properly as the computer starts, but then crashes? I get logs that indicate something is not properly identified, PCI cards do not work properly, etc.
Is there a way to get over this and how ? In my country the Apple care and service is not worth mentioning - won't say where as I might have to resort to the monopoly office...

Answer 1

Tortuga,
I too have a 1.25 GHZ Powerbook, and have had issues with my machine, and installing new RAM. I've solved it with my machine by buying the Kingston KTA range of RAM. I bought a 512MB module, so I could replace one of my stock 256MB modules, to take my RAM to 768MB.
If you want a 1GB module that is guaranteed to work, then you need the Kingston KTA-PBG4333/1G module. I know by listening to other people on this discussions site, that this RAM works, especially with the bus slewing models like the 1.25GHZ Powerbook.
These machines are extremely fussy about the RAM they take, but the 512MB module I have fitted is working fine, and is worth the extra I had to pay for it. Cheap RAM is not an option, if you want your machine to work without problems, I have found, through trial and error.
You'll have to look at Kingston suppliers in your Country (you mentioned Euros, so I assume you are in Europe somewhere), as I'm in the UK and RAM is expensive here anyway.
I believe the 1G Kingston module is around £128 from Orca Logic (that's who I got my memory from). I believe the Crucial memory is almost the same price, but I don't know if their memory works in the 1.25 GHZ machine like the Kingston KTA RAM does.
Alum Powerbook G4, 1.25Ghz Mac OS X (10.3.9)