Can Mac G5 use 800MHz Ram?
Can the G5 use 800 MHZ DDR2 SDRAM or do I need to use 533MHz?
Dual G5 1.8, Mac OS X (10.5.1)
Hi-
First, a full explanation of the memory specs, from the Apple Developer site.
The main logic board of the Power Mac G5 computer has 8 slots of DDR2 SDRAM expansion for unbuffered, DDR2-533 (PC2-4200) dual inline memory modules (DIMMs) for a maximum memory of 16 GB. The Power Mac G5 accepts both ECC and non-ECC DIMMs.
Each DIMM can contain 256 MB (non-ECC only), 512 MB, 1 GB, or 2 GB of double data rate synchronous dynamic RAM (DDR2 SDRAM). The Power Mac G5 supports CAS read latencies of 4 and 5.
Additional DIMMs must be installed in the bank slots in pairs of the same size and type; ECC and non-ECC cannot be paired in a single bank.
The RAM expansion slots accept 240-pin DDR2 SDRAM DIMMs that are 1.8 volt, unbuffered, 8-byte, ECC and non-ECC, and DDR2 533 MHz (PC2-4200) compliant.
DDR2 PC2-5300 (667mhz) DIMMS can be used, and most likely, DDR2 PC2-6400 (800mhz) as well, providing they meet all other compatibility requirements.
Using the faster rated memory will provide no performance gains, as the memory will operate a the speed of the memory bus, 533mhz.
So, it may be installable, but it won't be used to rated speed.
First, a full explanation of the memory specs, from the Apple Developer site.
The main logic board of the Power Mac G5 computer has 8 slots of DDR2 SDRAM expansion for unbuffered, DDR2-533 (PC2-4200) dual inline memory modules (DIMMs) for a maximum memory of 16 GB. The Power Mac G5 accepts both ECC and non-ECC DIMMs.
Each DIMM can contain 256 MB (non-ECC only), 512 MB, 1 GB, or 2 GB of double data rate synchronous dynamic RAM (DDR2 SDRAM). The Power Mac G5 supports CAS read latencies of 4 and 5.
Additional DIMMs must be installed in the bank slots in pairs of the same size and type; ECC and non-ECC cannot be paired in a single bank.
The RAM expansion slots accept 240-pin DDR2 SDRAM DIMMs that are 1.8 volt, unbuffered, 8-byte, ECC and non-ECC, and DDR2 533 MHz (PC2-4200) compliant.
DDR2 PC2-5300 (667mhz) DIMMS can be used, and most likely, DDR2 PC2-6400 (800mhz) as well, providing they meet all other compatibility requirements.
Using the faster rated memory will provide no performance gains, as the memory will operate a the speed of the memory bus, 533mhz.
So, it may be installable, but it won't be used to rated speed.
