AMD's Fiju GPU

The Fiji GPU is the first real 3D product in volume manufacturing. AMD's use of a silicon interposers with 65,000 TSVs and a logic die in the center of four HBM stacks with four DRAM each represents a major engineering achievement. the Fiji GPU has 4X bandwidth improvement per watt over AMD’s Radeon™ R9 290X. It has a 4,096-bit memory interface with four stacks creating 512GB/s of bandwidth, which is 60 percent more bandwidth than the Radeon™ R9 290X.