Linux driver fuels AMD Navi 12 rumors about Nvidia RTX 2080 Super performance
Linux driver files provide a wealth of information about unreleased graphics cards, if you know where to look. And we… don’t. But thankfully there are people out there who do, and one 3DCenter forum member has uncovered what looks to be the memory interface details behind the upcoming AMD Navi GPUs… the Navi 12 and Navi 14. That could tell us a lot about where the two new graphics chips are going to line up in the Radeon GPU stack.
And this has, in turn, led to a lot of speculation over the weekend about what this means for the graphics cards that will be built around these two slices of 7nm silicon, and some interesting conclusions have been made. Some sensible, and some rather wishful…
The driver-diving has uncovered references to the differing sdp_interfaces of the Navi 10 and 12 GPUs to those of the Navi 14 GPU. They indicate parity on the part of Navi 10 and 12, with the Navi 14 chip having fewer. Nightmare… those sdp_interfaces, eh?
So, what is an sdp_interface? The 3DCenter forumite at the centre of this story, Berniyh, first posted the discovery from inside the Mesa 3D Library and followed up with their take on what the listing could actually mean. From a HotChips chat about Raven Ridge last year the sdp_interface is understood to be a scalable data port, and the number of interfaces seemingly having a direct bearing on the width of the memory bus used on the chip.
With both the Navi 10 and 12 GPUs having 16 sdp_interfaces that would then seem to indicate a 256-bit memory bus, and as the Navi 14 entry lists just 8 sdp_interfaces that would suggest a 128-bit memory bus for the lower spec GPU.
Potential AMD Navi 14 GPU layout
The Navi 10 GPU design has four 64-bit memory controllers to make up the 256-bit aggregate memory bus, and it makes sense then for the Navi 12 GPU to match that layout; based on that you’d then expect the Navi 14 to sport just a pair of 64-bit memory controllers.
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