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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Desktops > PC100 2-2-2 vs PC133 3-3-3 RAM

PC100 2-2-2 vs PC133 3-3-3 RAM
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Nov 19, 2004, 12:47 PM
 
Greetings all.

I'm looking for some feedback here.

I have an older Gigabit G4 at home that I use for digital audio production.

I've had all 4 RAM banks in use with PC100 2-2-2 rated RAM.

A 512 Meg chip that I bought 3 yrs ago from Transintl.com went faulty recently. I got an RMA and sent it in for a replacement under the terms of their lifetime warranty. They were very helpful and sent a replacement 512 chip rather quickly.

After installing I checked software update and the chip is listed as PC133 3-3-3 RAM.

I've always only used 2-2-2 rated RAM and even their own website says to make sure you buy 2-2-2 RAM for your machine.

I just called them...

He claims that the fact that it's 133 negates the difference in speed code. However it seemss to me that the chip would automatically downclock to 100mhz and that still leaves a 3-3-3 process which would cause the system to access all RAM that way, theby creating a bit of a performance hit?

Am I right, or will performance be even slightly better as he suggested.

Maybe someone here who really understands the technology can shed some light.....

Many thanks!

Scott
http://www.titancreative.com
http://www.scottlanaway.com
     
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Join Date: May 2000
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Nov 19, 2004, 03:06 PM
 
PC133 CAS3 will downclock to PC100 speeds. Usually, it will run at CAS2 when downclocked to 100 MHz. It depends on the DIMM's firmware settings: if those settings allow CAS2 at 100 MHz, your system will use it that way - assuming all other sticks allow CAS2 at 100 MHz.

I don't know of a utility offhand that tells the CAS speed it's actually running at, as opposed to the CAS rating at the maximum speed. It's a good bet that it is running at CAS2 in your machine.
     
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Nov 19, 2004, 03:09 PM
 
That is great news - thanks for taking the time to let me know
http://www.titancreative.com
http://www.scottlanaway.com
     
   
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