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View Full Version : PowerMac G5 Ram upgrade - 2.5 volts vs. 2.6?




obie16175
Mar 3, 2008, 11:34 AM
Hello all,

My Power PC G5 dual 1.8GHz is in serious need of more ram. I've got a mere 768 mb now. Unfortunately the max on this model is 4 gb. I'm not sure why Apple made it is so low, but I'm interested in putting 4x 1gb dimms in, which is all it will take.

I've read a lot of posts on this and other forums regarding ram upgrade and most people seem happy with the bigger more reputable 3rd party companies like Crucial or kingston. These manufacturers will guaranty compatibility which is obviously important.

My first step was to look at the PowerMac G5 user guide. It states the following:
DIMMs must be installed in equal-sized pairs and fit these specifications:
• 400 MHz, PC 3200 DIMMs
• 2.5 volt (V)
• 184-pin module
• Maximum number of memory devices on DDR SDRAM: 16
• Nonparity
• No error-correcting codes (NECC)
• Unbuffered (registered or buffered DDR SDRAM cannot be used)

I'm having a hard time finding a chip that has 2.5 volts. Everywhere I look I come across 2.6 volts. How important is this? Crucial says that the 2.6 volt chip will work. Is this going to cause an overload of power or put a strain on the fans in my system if I go with a 2.6 volt chip?

Any thoughts on this would be greatly appreciated.

Thanks
obie16175