You may continue to use the slower RAM, although I recommend upgrading to faster RAM as soon as possible to get the most out of your processor upgrade. The main difference when installing RAM is the processor.
The single-processor models have a processor tray with a single large heat sink and one set of 4 memory slots fig. Dual-processor models have a processor tray with two large heatsinks and 8 memory slots fig. The 8 memory slots are grouped in sets of four; each group is next to its processor. Not all memory slots are created equal.
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The processors in the Mac Pro each contain three memory channels, which are wired to their memory slots in the following configuration. Slots 3 and 4, as well as slots 7 and 8, share a memory channel.
By not populating the second of the paired memory slots, you allow each memory module to connect to its own dedicated memory channel. If you do choose to populate the last memory slots, you may reduce optimum memory performance, but only when the memory in the shared slots is being accessed.
But this official support is based on the size of the RAM modules that were available when the Mac Pro first went on sale.
Know your Mac Pro's Model
If you choose the 16 GB modules, you can only populate the first three memory slots. Additionally, you cannot mix modules of different sizes; if you choose to use 16 GB modules, they must all be 16 GB. Notice that in the above configurations, slots 4 and 8 are the last to be populated, ensuring the best overall memory performance.
- 2. Remove CPU/RAM tray.
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The Definitive Classic Mac Pro (2006-2012) Upgrade Guide
Massive speed hit with too little memory Click to read analysis. Click to view recommended memory. More about CBD Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. So, what does that all mean? SDRAM is synchronous dynamic random access memory.
Memory Upgrades for Your 2009 - 2012 Mac Pro
In essence, the RAM and the processor memory bus are synchronized to the same clocking system. This RAM has a faster clock speed to match the faster memory controller in the 6-core and core processors.
Single-processor model. Dual-processor model.
- Mac Pro Memory Upgrades
Two memory modules: Slots 1 and 2. Three memory modules: Slots 1, 2, and 3. Four memory modules: Slots 1, 2, 3, and 4. Four memory modules: Slots 1, 2, 5, and 6. Six memory modules: Slots 1, 2, 3, 5, 6, and 7.