That is the ideal configuration for these systems four matched memory modules, which allows full quad-channel operation. Above 20GB, the biggest percentage improvement comes in going from 32GB as two 16GB DIMMs, to the same capacity but as four 8GB DIMMs for a 3.5% improvement. You can see where increases in total memory become less significant above 16GB. But each additional gigabyte got us closer.ĭropping back a bit and using a 20,000-pixel wide 15.7GB image gives the following results: Image used is 20,000 pixels across, and 15.7GB, X-axis is in seconds.
In this case, more memory always gives the most significant performance boost since there was never a time when everything fit. Image used is 40,000 pixels across, 56GB, X-axis is in seconds. We took a really large image file, in this case 40,000 pixels wide and 56GB in total size, and ran some scripted operations in Adobe Photoshop. Here is an example of a “memory hungry” situation. That being said, in the real world – as with the 2009-2012 model Mac Pros which supported up to triple-channel addressing and even with the 2006-2008 models that REQUIRED matched pairs – more memory trumps multi-channel addressing where you have an application or applications running that make use of that memory. This allows the system to use quad-channel addressing, which is the most effective mode of operation. When using a new Mac Pro 2013, installing four matched memory modules will get you optimal performance.
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