Really weird memory issue with powermac g4

[orangejedi]

Hi, I have an old 450mhz powermac g4 and about a billion old sticks of pc133 (and some pc100) ram.
So I have 3 128mb PC133 memory sticks, and when i put each in the powermac individually (as the only mem stick in the computer), they work fine.
However, if i put any more than one stick in the computer, it will turn on but not boot up or display anything.
Wha???
This computer is my "storage dump" and web server
Could someone please help me fix it?
thanks in advance!

 

[SmurfBoxMasta]

Those old G4's could only read low-density ram.....ie the ones with dram chips on BOTH sides of the circuit boards, and they can NOT be mixed in with high-density sticks..ie the ones with dram chips only on 1 side of the board.....

Also, some of those G4's were picky about mixed-speed ram too, so either use all PC-100 or all PC-133 just to be safe