After putting another R9 380X through its paces, I was a little apprehensive when it came time to overclock PowerColor's PCS+ R9 380X. Those fears were soon dismissed as I started pushing up the core clock speed, as 1100MHz was an easy stretch at full stability. At 1150MHz, it would pass some basic stability tests, but was only good enough for some of the less stressful benches. While 1150MHz would have been a really decent clock speed, I had to back it down to 1126MHz to run all the benches long term. After 30 minutes of looping the Heaven 4 benchmark, 1126MHz was the applied and in use clock speed. Something nice to see is AMD is using variable clock speeds now. Memory overclocking was just as fruitful, with a final clock speed of 1601MHz or a 126MHz boost over the factory overclocked 1475MHz speed. Boosts of 106MHz on the core and 126MHz on the GDDR5 memory are nothing to sneeze at when you look at the performance increase potential this adds to the FPS bottom line. On a percentage basis, the core clock speed increase is just over 10% on the core and around 8.5% on the 4GB of memory.