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note that the performance for 64-bit floating point is decreasing relative to the 32-bit performance due to increasingly-highly optimized 32-bit instructions, not because the actual 64-bit performance is decreasing. it also depends on the actual benchmark used; I wonder if the 32-bit performance deficit highlighted in these benchmarks is due to memory bandwidth issues as well as actual computational speed

sig_seg_v
– sig_seg_v

2016-04-26 22:35:54 +00:00
Commented Apr 26, 2016 at 22:35
If you're going to talk about DP performance in graphics cards you should definitely mention the Titan/Titan Black. Both feature mods that allow the card to reach 1/3 performance, at the cost of single precision performance.

SGR
– SGR

2016-04-27 08:32:29 +00:00
Commented Apr 27, 2016 at 8:32
@sig_seg_v There are definitely at least some cases where the 64-bit performance decreases absolutely, not just relatively. See these results for a double precision Folding@Home benchmark, where a GTX 780 Ti beats both a GTX 1080 (another 1/32 ratio card) and a 980 Ti, and on AMD's side, the 7970 (a 1/4 ratio card), as well as the R9 290 and R9 290X all beat the R9 Fury series. Compare that to the single precision version of the benchmark, where the newer cards all handily outperform their predecessors.

8bittree
– 8bittree

2016-07-26 00:12:57 +00:00
Commented Jul 26, 2016 at 0:12

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