Radeon RX 550 vs Radeon RX 640 benchmarks
In our benchmarks, the Radeon RX 550 beats the Radeon RX 640 in gaming performance.
The Radeon RX 550 has a slightly higher core clock speed. The core clock speed (or base speed) is the frequency at which the GPU core runs. This metric makes sense when comparing GPUs of a similar architecture or generation. Despite this, the Radeon RX 640 has a slightly higher boost clock speed. This is a frequency that can be reached if the GPU is cooled sufficiently and has enough power.
Furthermore, the spec sheet for both these GPUs show that they both have the same amount of memory at 4 GiB. Memory size doesn't directly affect performance, but too little memory will certainly degrade gaming performance.
In addition, both the Radeon RX 550 and the Radeon RX 640 have an identical TDP. TDP (Thermal Design Power) measures total heat output from the chip.
In conclusion, all specs and GPU benchmarks considered, will recommend the Radeon RX 550 over the Radeon RX 640.