Memory subsystem performance
To get a basic idea of how much data these CPUs can move around, we use the benchmarks built into the handy AIDA64 utility.
With DDR4-3200 in play across the board, Ryzen 3 chips generally enjoy similar or slightly higher theoretical bandwidth than the Intel competition, at the expense of much higher latency. Ryzen 3 doesn't do anything to change this well-worn story.
Some quick synthetic math tests
AIDA64 offers a useful set of built-in directed benchmarks for assessing the performance of the various subsystems of a CPU. The PhotoWorxx benchmark uses AVX2 on compatible CPUs, while the FPU Julia and Mandel tests use AVX2 with FMA.
Since Intel's Skylake and Kaby Lake cores have about twice the theoretical AVX throughput as their Ryzen competitors, it's no shock that dual-core Core i3s and quad-core Ryzens are close competitors in this test. The i5-7500 and its four discrete cores let it double the floating-point performance of the rest of the field as a result of this throughput difference, as well. Otherwise, the Core i3s and Ryzen 3s seem closely matched. Let's see how that scenario plays out in games.