Only more precision. But no, doubles are not faster. At best they’re the same instruction latency & throughput as singles, and that’s only on a few expensive pro/datacenter GPUs. Even if they are technically the same instruction speed, they’re still 2x the memory & register usage, which can compromise perf in other ways. Doubles on consumer GPUs are typically anywhere from 16 to 64 times slower than singles.
FWIW, I’ve never heard of shader replacement to force doubles. It’d be interesting to hear when that’s been used and why, and surprising to me if it was ever done for a popular game.
FWIW, I’ve never heard of shader replacement to force doubles. It’d be interesting to hear when that’s been used and why, and surprising to me if it was ever done for a popular game.