CatMerc
Golden Member
- Jul 16, 2016
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HBC helps with capacity restricted situations, not bandwidth restricted. They utilize the high bandwidth to do that, but if you have low bandwidth it won't help.HBC != HBM.
HBM would be awesome for performance, but it would have a very small market. An exascale APU, however, may have enough of a market to make it worthwhile.
HBC is specifically designed by AMD to enable bandwidth restricted scenarios to perform MUCH better (+50% avg, +100% min according to AMD... so 20%/40% better ).
XBone does exactly that, but with a strict reliance on software support. If AMD has required software support for the HBC, then they would be stupid to even develop it - a waste of resources (unless it's just for consoles...).
APUs are insanely limited by memory bandwidth. To the point that the lowest APU and highest APU in the same generation perform about the same, despite 33% more resources on the higher end APUs. My A8-7600 with DDR3-2133 CL9 is much better than with DDR3-1600 CL9. It took Hitman Absolution from laughably unplayable to reasonably playable.
The 50%/100% result was from testing Vega being artifically restricted to 2GB of VRAM, vs the full capacity of Vega.
With Vega they're switching to a tiled rasterizer, which should help immensly with bandwidth.
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