Radeon R9 390 vs Radeon RX 580 specs and performance
In our benchmarks, the Radeon RX 580 beats the Radeon R9 390 in gaming performance.
Our database shows that the Radeon RX 580 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. In addition, the Radeon RX 580 also has a slightly higher boost clock speed: the maximum frequency the chip can reach if power delivery and thermals allow.
Furthermore, the spec sheet for both these GPUs show that they both have the same amount of memory at 8 GiB. Memory size doesn't directly affect performance, but too little memory will certainly degrade gaming performance.
In addition, the Radeon RX 580 has a significantly lower TDP at 185 W when compared to the Radeon R9 390 at 275 W. TDP (Thermal Design Power) measures total heat output from the chip.
In conclusion, all specs and GPU benchmarks considered, will recommend the Radeon RX 580 over the Radeon R9 390.