I was not able to go above 256 mb in my Wallstreet (128 in each slot,
Kingston Memory) with the Powerlogix 466 processor installed, anything above
this gave the window breaking sound and no start-up.
Using the stock card from Apple (233mhz), I was able go higher to 384 mb.
Is there any trick to this to reach 512 mb and keep the Powerlogix card?
Okay... This is all theoretical, but in case nobody else bites: Given that both cards run the bus at the same speed, and assuming that the boot ROM is on the processor card (which it usually/always is in Apple products?) there are two possible reasons why "X" combination of SODIMMs would work with the Apple card but not the Powerlogix card:
1. ROMs on the Powerlogix card don't recognize the SPD info from your SODIMMs. (SODIMMs have a small serial EEPROM on them, containing information describing the speed and layout of the RAM).
2. SODIMM sockets don't have the same address wiring on the Powerlogix vs. Apple card.
If 2 is true, you're SOL.
If 1 is true, AND the boot ROM in this card is flash memory, you might be able to fix the situation by getting the latest flash update from Apple and installing it on the Powerlogix card, then adding your additional RAM.
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