i have an powermac g5(early 2005) and i have 4 available memory slots(2 pairs). the memory slots came with 256 mb cards. I just bought a 2 pack of 1 gb memory cards which meet the requirements but when i took out 1 pair and put in the new one the computer would not boot up(1 pair of 1gb and 1 pair of 256 mb). Do i have to have all of the same kind? Any info would help.
PowerMac, Mac OS X (10.5.8)
You don't have to have all the same size pairs, just two pair consisting of 1 pair each size.
The memory needs to be installed, in pairs, from the inside out; 2-1 1-2 or 4-3-2-1 1-2-3-4 depending on the G5 model.
Make sure the memory is completely seated.
Even if the memory is of a similar specification, if the memory is not "guaranteed Mac compatible" that could be a reason to not function.
RAM needs to contain some specific information for PPC machines.
PC "value RAM" rarely works in a Mac.
Mac compatible memoryfrom a Mac specialist.
You don't have to have all the same size pairs, just two pair consisting of 1 pair each size.
The memory needs to be installed, in pairs, from the inside out; 2-1 1-2 or 4-3-2-1 1-2-3-4 depending on the G5 model.
Make sure the memory is completely seated.
Even if the memory is of a similar specification, if the memory is not "guaranteed Mac compatible" that could be a reason to not function.
RAM needs to contain some specific information for PPC machines.
PC "value RAM" rarely works in a Mac.
Mac compatible memoryfrom a Mac specialist.
Here's what is required:
4 (dual 2.0 GHz), or 8 - PC-3200 (dual 2.3 GHz+) 2.5v, unbuffered, 8-byte, nonparity 184-pin DDR SDRAM (matched pairs)
Be sure you bought the correctly specified products. RAM is installed in matched pairs. Be sure you install each pair in their proper slots.
i bought a pair of memory master 1 gb desktop ddr pc3200 (400mhz)
It meets all the specifications of the computer except that it does not say it is 184 pin
Does anyone know why this memory wont work. (just as like a test i took out 2 of the 4 ram cards that were in there origionaly to see if it would work with just 2 256 cards but it did not boot up.
i took out 2 of the 4 ram cards that were in there origionaly to see if it would work with just 2 256 cards but it did not boot up.
You need to have a pair of DIMMs in the innermost slots.
If you didn't, that is likely why it wouldn't boot.
With a pair of old DIMMs in the inside slots, the machine should boot with or without RAM in the outer slots.
Most often, with incompatible RAM, beeps will be heard at startup, or, the new memory won't report.
Does anyone know why this memory wont work.
If the memory does not have the proper programming in the EEPROM, it will either not show up or misreport.
If the voltage is wrong, it will not show up or it will prevent boot.
If the spec is wrong, it will not show up, prevent boot or misreport.
I'd say that the RAM is simply NOT Mac compatible.
Macs are more specific in RAM requirements due to firmware conditions programmed by Apple.
Most PC/DeskTop RAM will not work in a G5.
Im not really sure what you mean by the innermost slots?
My computer has 2 pairs of slots
for example this is how it is set up:
slot1
slot2
slot3
slot4
The slots that you call 2 and 3 are pair 1. The slots that you call 1 and 4 are pair 2.
Place your RAM 2-1 1-2,
2
1
1
2
Fill the two 1 slots with one pair.
Then, fill the two 2 slots with another pair.
For now, use a pair of the original RAM in the two 1 slots.
Here is an Apple document:
I will try that
I switched them out into the correct order and it will boot up now but when i go to memory specifications it says that the slots with the new ones are empty.
Does this mean that they dont work or that i didnt put them in right?
Does this mean that they dont work or that i didnt put them in right?
It means that they don't work.
They are not compatible with a Mac.
You're welcome!
powermac g5 memory upgrade?
