The best way to measure performance is by using real programs. The problem, though, is creating a methodology using real software that provides accurate results. For Photoshop CS4, there is a methodology created by the folks at GamingHeaven that is very accurate. Their script applies a series of 15 filters to a sample image, and we wrote down the time taken for each filter to run. At the end, we had the results for each individual filter. We simply added them up to have the total time taken to run the 15 filters from the GamingHeaven batch. The results below are given in seconds, so the lower the number the better.
On Photoshop CS4, the Core i3-2105 was 37% faster than the A8-3870K, and the Core i3-2100 was 34% faster than the A8-3850. Both AMD CPUs achieved the same performance level.