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Mac pro 4.1 memory upgrade

With so many variations in memory, it's important to understand just exactly what will work — and what won't — in your system. Using the Memory Advisor or Scanner on Crucial. Or your money back.

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Your system may support multiple memory configurations based on the density, quantity and type of memory modules installed. Please consult the documentation for your specific system. I came across this Timetec ram at Amazon. I was a bit skeptical because I never heard of this brand. But because of the rating I wanted to give it a shot. The installation was super easy. Now my mac responds very fast.

The Most Powerful Mac Is 6 Years Old and Not Sold By Apple

I'm really impressed. I'm hoping that this ram is not going to fail on me. If things change, I'll update my review. But for now, it's awesome.


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OWC Upgrade your memory, it easy and not that expensive. I followed the directions on the video from OWC and the installation took only a couple of minutes on my iMac 27inch computer. It works well!


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All four 8GB sticks came professionally packaged. OWC even included a plastic opener for the ram lever although I did not use need to use it. I will purchase from OWC again.. I ordered two sets of these for my dad's iMac and they fit and work perfectly. Don't buy anything that's not Apple Certified, I made that mistake twice before finding these.

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Cheaper brands end up arriving dead on arrival, cost you return shipping, and too much aggravation. It came sealed in a perfect container, keeping it extra safe, and was extremely easy to install. I highly recommend getting this. This is the perfect upgrade for mi iMac. The importan question: Why OWC? I have been told because of the processor's triple-channel memory capability that I should be installing RAM modules in sets of three.

I do a lot of compiling on this machine and want to maximize all the hardware I've got. Does it follow that I should avoid installing RAM in the last two slots? The direct answer to your question is you will get marginally higher peak memory bandwidth with 6 matched memory modules running in triple channel mode than you will with 8 matched memory modules in dual channel mode. However, there are no guarantees that your machine will perform the tasks you use it for any quicker in either mode.

You need a more in-depth analysis than that. Firstly, here are the memory replacement instructions for your Mac. In summary, the instructions for your model go like so:.

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Dual-processor computers have eight memory slots, four per processor. DIMM slots 1, 2, 5, and 6 have their own channels; slots 3 and 4 share a channel and slots 7 and 8 share a channel. For optimal memory bandwidth, all six memory channels should be used, and memory should be balanced across the six channels. Note: Populating slot 4 or 8 slightly drops maximum memory bandwidth, but depending on the applications used, overall system performance may benefit from the larger amount of memory.

The Definitive Classic Mac Pro (2006-2012) Upgrade Guide

To determine whether you would benefit from more total RAM or from keeping your RAM in triple channel mode would require benchmarks. It's difficult without measuring usage to say whether there will be any benefit from adding more RAM. The important thing here is to find the bottleneck rather than hoping that adding RAM will make things run quicker.

It may even turn out that the CPU or the compiler is the bottleneck. If you have two 6-core CPUs, can your compiler use all that processing power? I know I've probably raised more questions than I've answered but it's worth considering them if you're looking for a performance improvement for your investment. If you are a programmer you probably understand these concepts anyway but here's a link to a codinghorror article just explaining the process of finding bottlenecks which I think is easy to read.

The OS in this case is windows but the principles are the same. You can use Activity Monitor or a third party resource monitoring tool to determine the bottleneck. Near the bottom of the window, select the tab button labelled 'System Memory' and take a look at the pie chart and figures listed beneath. Here's an example from my system.

Memory Upgrade for Mac Pro (2009) - 16GB Upgrade