We made some test 5700XT, nanominer, claymore, phoenix almost same results. (around 1MH difference -/+)

With claymore-eth ~51.2 MH/s, ~100W from wall (whole demo PC with one GPU is ~175W)

Memory: 920 Mhz
Power Limit: -45%
VDDC: 800mV (for 1200Mhz)

Efficiency: 0,512 MH/W

Stock clock benchmarks can be found here. (120 sec results)