I was looking for a way to really stress test the memory in real world settings. Hardware Haven has a photoshop benchmark that tests memory and CPU performance. Part of the testing was to illustrate the performance difference, if any where memory capacity is a factor. To meet that goal, I took the standard image and resized it from 109 Mb to 499 Mb. The test measures time it takes to complete each section of the benchmark, so a lower time is a better result.
At the stock speeds performance is similar across all three setups. There are a few tests where the better timings push the Kingston HyperX Predator into the lead. During the lighting effects test the greater capacity of the 24 GB gives a substantial decrease in time to render. During this test the 8 GB and 16 GB kits used all of the available memory that Photoshop would allow. The default setting is 60% of available system memory. Only the 24 GB kit used less, memory consumption was roughly 45%.
We see similar results at the fastest speeds for each memory test. Again memory loading for the 8 GB and 16 GB kits used all 60% of the memory that Photoshop was allowed to use.
The results are the same in the 1600 MHz testing as well as the memory utilization.