One of the first applications that came to mind with HBM was pairing it up with an AMD APU. Proven to work as VRAM with the Fiji GPUs last year, HBM also has possible applications to act as a high-speed cache for other applications where density is important. While we’ve known that AMD has been planning APUs with HBM, the latest report points to Raven Ridge, the 2017 series of APUs that follow Bristol Ridge, to have HBM.
According to the source, Raven Ridge will utilize AMD’s upcoming Zen CPU cores likely paired with Polaris GCN iGPU. With 14nmLPP and Polaris, AMD can stuff a much larger iGPU with their APUs without worrying too much about extra costs or ballooning die size. However, even with the current generation of APUs, the iGPU is bottlenecked at the high-end, something even DDR4 won’t fully solve.
In order to keep growing APU GPU performance, AMD also needs to increase the memory bandwidth. One way, of course, is to use eDRAM as Intel has done with notable success. That, however, is expensive, leading to the top SKUs costing near $400. In comes HBM to the rescue at a relatively lower cost, allowing a large yet budget friendly cache pool to help reduce bandwidth constraints. To produce this, AMD has tapped Amkor, the same firm that worked on Fiji interposers to package Raven Ridge.
With at least, 1GB HBM buffer, the APU will be very well fed, allowing for the iGPU to grow to at least R7 370 performance levels before running out of steam. AMD is also probably working on HMC to supplant HBM in the future as well. If AMD manages to pull this off, Raven Ridge will be the most potent APUs yet, securing the crown against Intel.