If I have 3 DIMM's full of PC 133 RAM in my PM G4..

Ryan T.

macrumors 6502a
Original poster
Jun 13, 2005
599
27
Rochester, NY
am I able to install a stick of PC100? Also, can I just install 256MB sticks, or would a half gig stick of RAM work, bringing my total up to 1.25GB...?

Thanks for your insight.
 

edwardk9

macrumors member
Apr 24, 2005
97
0
Georgia
Macs are picky about ram but I have three 133 and one 100. I have one 512 two 256 and a 128 so it could work.
 

7254278

macrumors 68020
Apr 11, 2004
2,365
0
NYC
If the bus speed is 133mhz and you have pc 133 ram then dont put pc100 ram in the computer because ram always runs as fast as the slowest link so it will slow down all the other ram chips to 100mhz.
 

Ryan T.

macrumors 6502a
Original poster
Jun 13, 2005
599
27
Rochester, NY
edwardk9 said:
Macs are picky about ram but I have three 133 and one 100. I have one 512 two 256 and a 128 so it could work.
thanks, thats exactly what I'm looking for. We have different motherboards, but both G4's, so hopefully it'll be alright.
 

Ryan T.

macrumors 6502a
Original poster
Jun 13, 2005
599
27
Rochester, NY
Patmian212 said:
If the bus speed is 133mhz and you have pc 133 ram then dont put pc100 ram in the computer because ram always runs as fast as the slowest link so it will slow down all the other ram chips to 100mhz.
I have a Dual 450 though, which I think is 100MHz bus anyway...
 

Sun Baked

macrumors G5
May 19, 2002
14,874
57
Ryan T. said:
I have a Dual 450 though, which I think is 100MHz bus anyway...
Then it will run at 100MHz...

But the faster RAM should get over the problem the Macs with the 100MHz FSB had with RAM -- they were very strict RAM spec machines better served by PC133.

BTW, Apple fixed the problem with the 100MHz FSB machines by requiring PC133 anyways.

Basically put generic PC100 in it and it may not work, generic PC133 should almost always work.

So stick with PC133 ... or be prepared to return the PC100.