Quote from: dallase on May 27, 2017, 02:33:47 AM

:'(Was testing MSI RX580 8GB w/ Samsung memory tonight.

28.9mh/s with
* amdgpu-pro 16.60
* 1150/2100mhz
* Uber Mix 3.1

28.1 mh/s with
* amdgpu-pro 17.10 drivers
* 1150/2100mhz
* Uber Mix 3.1

And not really stable at all.

Not sure why 17.10 drivers cause such a big drop in hash rate.. Started looking at the timings from the 470's with Samsung vs the 580 with Samsung, and all of the timings on the 580 are slower. trfc's and ras2ras are significant

Code:

------------------------------------------------------------------------------------------------------------------------
Strap (RAS) trc trcdr trcdra trcdw trcdwa trrd
------------------------------------------------------------------------------------------------------------------------
Sammy-1625-rx470 68 22 22 14 14 6
Sammy-1625-rx580 71 24 24 14 14 6
Sammy-1750-rx470 73 24 24 16 16 6
Sammy-1750-rx580 77 26 26 16 16 6
------------------------------------------------------------------------------------------------------------------------
Strap (CAS) tccdl tcl tnopr tnopw tr2r tr2w tw2r
------------------------------------------------------------------------------------------------------------------------
Sammy-1625-rx470 3 21 0 0 5 29 15
Sammy-1625-rx580 3 21 0 0 5 29 15
Sammy-1750-rx470 3 22 0 0 5 29 16
Sammy-1750-rx580 3 22 0 0 5 29 16
------------------------------------------------------------------------------------------------------------------------
Strap (MISC) trfc trp trprda trpwra
------------------------------------------------------------------------------------------------------------------------
Sammy-1625-rx470 146 9 11 49
Sammy-1625-rx580 178 11 12 52
Sammy-1750-rx470 157 10 11 53
Sammy-1750-rx580 192 12 13 57
------------------------------------------------------------------------------------------------------------------------
Strap (MISC2) faw pa2rdata pa2wdata t32aw tredc twdatatr twedc
------------------------------------------------------------------------------------------------------------------------
Sammy-1625-rx470 10 0 0 7 2 0 7
Sammy-1625-rx580 10 0 0 7 3 0 7
Sammy-1750-rx470 10 0 0 7 2 0 7
Sammy-1750-rx580 10 0 0 7 3 0 7
------------------------------------------------------------------------------------------------------------------------
Strap (ARB1) actrd actwr rasmactrd rasmactwr
------------------------------------------------------------------------------------------------------------------------
Sammy-1625-rx470 23 15 46 54
Sammy-1625-rx580 25 15 47 57
Sammy-1750-rx470 25 17 49 57
Sammy-1750-rx580 27 17 51 61
------------------------------------------------------------------------------------------------------------------------
Strap (ARB2) bus_turn ras2ras rp wrplusrp
------------------------------------------------------------------------------------------------------------------------
Sammy-1625-rx470 23 146 42 50
Sammy-1625-rx580 23 178 45 53
Sammy-1750-rx470 23 157 44 54
Sammy-1750-rx580 23 192 48 58
------------------------------------------------------------------------------------------------------------------------

Anyone have any bright ideas as to why?

Finally got it over 30mh. From uber 3.1 strap, I had to bump up trc, trfc, ras2ras, and clocks now 1185/2125, running stable. Seems like the 580's need a bit more core clock, but they do take a better undervolt, so power remains about the same.