An excerpt from my Mac Pro 2013 Choosing the CPU / GPU page:
Not sure? Consult with Lloyd Chambers.
Here’s a specification that caught my eye, just in case I feel like computing in Nepal:
Maximum altitude: 16,400 feet (5000 meters)
And 12 dBA at idle acoustics is simply amazing for a workstation-grade computer.
Choosing the right CPU for your needs
See the discussion.
|CPU Cores||Clock Speed||Cache Memory||Mainstream Task Speed*||Core-Friendly Speed**||Comments|
|Higher numbers are faster|
+37% / +5.7%
||Fastest for general use due to highest clock speed, but certain operations in programs like Adobe Photoshop Lightroom will be slower than with 6-core or 8-core options—and others will be faster! It all depends.|
~ 5.6 ±
+30% / + 16%
|14.0||18.9||About 5% slower than the 4-core in clock speed, but the two extra CPU cores are WELL worth it for programs like Adobe Photoshop Lightroom. Best all-around solution.|
|12.0||19.2||With a 14% drop in clock speed, the 8-core model is not likely to outperform the 6-core model for most tasks, but it has more cache memory and this might mitigate the clock speed losses. And it’s a good middle ground for workflows which mix video with other tasks.
Still, Photoshop hardly ever uses even 4 cores for common tasks. The 8-core is really for video processing or other specialty tasks which can use all the cores.
|10.8||22.7||Appropriate only for video users, unless big changes accrue, Photoshop and Lightroom and all productivity software will run slowest on this machine.|
* Ordinary Task Speed = expected speed with mainstream tasks which typically use four CPU cores or fewer and rarely more except for brief spikes.
** Core-Friendly = Estimated real-world best-case performance taking into account clock speed and CPU cores, application multi-threading efficiency, memory contention.
± Taking clock speed into account, the equivalent number of 3.7 GHz CPU cores (multiplier of # of cores times the clock speed). This does not take the inevitable multi-core overhead into account (hardware and software factor), which degrades performance as the number of CPU cores increases.