Mixing PC133 and PC100 memory

Question

I just bought a G4 (Digital Audio) 466. I wanted to add more ram, so I bought a PC 133 512 card. When I checked the system profiler, it shows two cards already installed, one a 128 PC 133, and the other a 128 PC 100. It's working fine, and with the new 512 in it, it's working fine. I believe I read somwhere that with a PC 100 card in it, it will only allow the other PC 133 cards to run at 100 mHz; only as fast as the slowest component. So my question is, is this true? And, is it a noticable difference? If I remove the PC 100 card and just go with the two PC 133 cards, for a total ram of 640 @ 133 mHz, instead of 768 ram @ 100 mHz, will it be faster? Or should I stick with the higher ram count until I can replace it with another PC 133?

Answer 1

Your computer calls for 133 per Mactracker [free download].
My computer calls for 100 but I use 133 because it was easier to find, Thc computer will only run the ram at 100.
If your computer is running fine with what you have, don't worry.
My understanding is that the computer board calls for the RAM speed, thus if it calls for 100 then the 133 will run at 100. The ram only responds to the computer not the other ram. However, at the low cost of ram you could easily replace one slower stick with a new 133 one. Go for a 512mb module then you will see a real difference.
Confusing, go to www.crucia.com and ask their tech support.