Sapphire unveiled its highest tuning air-cooled TOXIC variant for the Radeon R9 390. Targeted at the Greater China region (PRC, Hong Kong, Taiwan), this card features a swanky new VaporX vapor-chamber cooling solution, and the highest factory-overclock by the company for this chip. The core is clocked at 1120 MHz against reference clocks of 1000 MHz, and an untouched 6.00 GHz (GDDR5-effective) memory clock.The cooling solution consists of a large vapor-chamber plate, from which a number of 8 mm-thick copper heat pipes convey heat to two aluminium fin stacks, which are ventilated by three 100 mm spinners. A chunky, ridged, aluminium base-plate covers nearly every other part of the PCB, cooling the VRM and memory chips. Based on the 28 nm "Grenada" silicon, the R9 390 features 2,560 stream processors, 160 TMUs, 64 ROPs, and a 512-bit wide GDDR5 memory interface, holding 8 GB of memory.