Hi guys, started doing my homework and ingested alot of info from this forum and the Jedec Documents but need some professional help.
I have an 11 Rx 560 2gb since last January, i notice in bulk they are much more power efficient than 580/570 mainly in cryptonight.
Started by 2X Gigabyte one 6 pin powered and one not, sarcastically, BOTH clocked 2025+ with the Elpida Strap, they steadily do 540 h/s in CN V7 or old CN then bought many others, ALL of the others had a different Elpida batch "i.e lower bandwidth ones clocked at 1750, near thier maximum from the factory" thus, ALL of them can never go above 1900 Mhz memory giving ~500 h/s (one click elpida strap is good on low memory speeds)
FYI, many Elpidas BABG/Hynix AJR are of lower grade although they share the same name in software/bios (micron 4gb though, does have 1500mhz variants ending with "-60", which is at least honest).
Last GPUs i got were quite rare, Sapphire 2gb "6 pin powered" all of them Hynix AJR, these were a real disappointment, with one click strap they do 1850-1900 Mhz maximum, compared to my 5x 580/570 with a hynix AJR (clocking between 2025-2175) its Obvious here, that no silicon lottery here, thats only lower bandwidth stock Hynix AJR.
I now need help with:
*In general for all memory types except samsung
Cryptonight, is RRD=6 (5 being extreme?), Zeroing tFAW and t32AW of any worthiness or impact? what should i increase and which should i relax?
*trying to do a custom strap for Hynix AJR lower bandwidth for ~ 2000 mhz cryptonight.
I started with the one click strap, relaxing CAS latency, dropping the ACTRD back to 1625mhz strap levels and as much as i can try to keep TRFC and TRC within thier values, Relaxing TRCDR/A to 1625ish levels and decreasing TRCDW/A.
Do you think this is the right path for tweaking for cryptonight? I surely have to experiment, but my first experiment so far was wierd
hash rate dropped, also i noticed some straps having RASMACTRD/RASMACTWR substantially relaxed. quite confusing here.
*Last, On higher quality elpidas, One click strap, nothing above 540 h/s is achievable, ~1975 mhz almost being the limit (well even on 1900mhz, it does 505 h/s) how/what path can i take to customize the strap for ~2050 mhz point.
P.S: 16 CU are alot/ increasing gpu frequency above 1150 mhz, yields no improvement whatsoever, so its not a compute limit issue, obviuolsly strap issue.
Anyway, appreciate any hints.
Edit:Forgot to add that I'm using (actually, not touching) the 1625mhz strap "learning?" parameters
MC_SEQ_MISC1 0x20140475
MC_SEQ_MISC3 0xA000896A
MC_SEQ_MISC8 0x20310002