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Old Nov 5, 2005, 07:41 PM   #1
GreenDice
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Mixing memory modules in Powermac G5

If I have both CAS3 and CAS4 RAM modules for the PowerMac, will the computer automatically use the lowest speed for both? They are both DDR2 PC2-4200 533Mhz but the CAS3 memory have faster timing.

If so, I should replace the factory-installed CAS4 RAM with the faster RAM.

Thanks in advance.
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Old Nov 5, 2005, 07:42 PM   #2
homerjward
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Quote:
Originally Posted by GreenDice
If I have both CAS3 and CAS4 RAM modules for the PowerMac, will the computer automatically use the lowest speed for both? They are both DDR2 PC2-4200 533Mhz but the CAS3 memory have faster timing.

If so, I should replace the factory-installed CAS4 RAM with the faster RAM.

Thanks in advance.
don't quote me on this but i don't believe the g5 will run it any faster than CAS4. this was also true of the older g5s which wouldn't run anything faster than CAS3.
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Old Nov 5, 2005, 08:14 PM   #3
Sun Baked
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It's not going to make any significant difference what CAS level you choose.

Having enough memory to avoid the Virtual Memory penalty matters MUCH MORE than having too little of a more expensive memory choice.

Too little memory, and you will hit the "as fast as a HD" memory speed bump.
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