MP 1,1-5,1 Mac Pro 3.1 memory frequency limit for overclocking

[friendofthai]

I am currently using a dual Xeon 2.8 Ghz configuration with 8 GB 667 MHz DDR2 FB-DIMM memory.

I want to buy a Xeon 3.1 model designed to work with 667 MHz memory and overclock the processor to about 3.4-3.6 Ghz. I suppose if I buy memory designed to work at 800MHz, the system will initially start using memory at 667 MHz so memory will not limit overclocking potential of the system (because It can work at 800 MHz by design) and only processor will limit the overclocking potential of the system.

Is it true? Or the system will initially start using memory at 800MHz so that the overall overclocking potential of the system will be limited by memory, not processor.

I am using this tool for overclocking my Mac Pro 3.1 at macOS Ventura -

GitHub - mkrasnorutsky/MacProOverclockUtility: Mac Pro 1.1, 2.1 & 3.1 Overclock utility

Mac Pro 1.1, 2.1 & 3.1 Overclock utility. Contribute to mkrasnorutsky/MacProOverclockUtility development by creating an account on GitHub.

github.com

 

[Dayo]

I want to buy a Xeon 3.1 model designed to work with 667 MHz memory

All MP31 models are designed to work with both 667MHz and 800MHz RAM.
If you mix and match stick speeds, you will get the lower speed on all.

 

[friendofthai]

I am planing to completely remove the 667 MHz sticks and replace them with the 800 MHz ones. So It is not clear if the system will start memory in the 667 MHz mode (synchronously with the processor) or in the 800 MHz mode (asynchronously)