I recently decided to take another look at RAM timings now that many people have been playing with custom timings for several months.

Instead of zeroing FAW/32AW as I do in my strapmod utility, I think it is better to set them low.  7/10 seems to be standard for Hynix straps, while 6/8 is typical for Samsung.  My testing so far using 6/8 on Hynix gives the same performance for eth mining as 0/0, while potentially being more stable at higher memory clocks.
I also suspect the field labels may be reversed, so FAW is really 32AW, and vice-verse.  In my testing, when I set "FAW" to 8 or 10 while leaving "32AW" to zero, I see no slowdown in ethash speed.

I may update my strapmod when I'm done, but my goal is to finally finish a Linux tool I started working on last year that tweaks timings at runtime.  This allows for tuning the memory timing for ethash, equihash, or cryptonight without reflashing the BIOS and rebooting.  It has already greatly improved strap testing, as I have been able to modify timings on the fly while mining; I don't even have to restart the miner.  I still crash the GPU a lot, as dynamically switching between two sets of good timing will still cause a hang depending on which timings you switch in what order.

So you've been playing with umr
Are you going to release your tool for the public or keep it private? I myself have similar tool that does that but only for private use.

What is umr ?  

You can download JEDEC GDDR5 datasheet from their web

Hi

Currently I have HIS RX570 4GB with Elpida EDW4032BABG. Default straps is below:
1500: 777000000000000022AA1C00315A6B3CA0550F15B68C1506006AE4007C041420CA8980A90200000 01712262B612B3715
1625: 777000000000000022AA1C0073627C41B0551016BA0D9606006C060104061420EA8940AA0300000 01914292E692E3B16
1750: 777000000000000022AA1C00B56A7D46C0551017BE8E1607006C07010C081420FA8900AB0300000 01B162C3171313F17
2000: 999000000000000022AA1C0018F77E4FD055121946501708006C07011D0C1420FA8980AC0300000 01E19323781364718

I am copying 1500 to 1625, 1750 and 2000. By setting memory clock to 1950Mhz (1040mhz core), I am able to get 750hash/sec cryptonight or 28 Mh/sec Ethash. Any idea if this can be improved further?

Thanks

Hi,

I am using latest claymore cryptonight.

Between the three, I am guessing that the bottom one is the most aggressive timing with best results?

So I tried that @1208,2000, 963mv vddc (higher than 2000 makes it got too much memory error count in HWInfo64, and I now got 910 H/sec cryptonight each card. Thanks for helping

Any old timers here get any good results with legacy GPUs.



7970/280x I get about 620 H/s
290 I get about 700 H/s
R9 270 with Hynix I get about 530 H/s

Anyone play around with their memory straps to get faster speeds?

Yeah already running the Stilt bios for the 290. Doesn't seem to make much difference from stock with XMR.

It helped during Litecoin days.

For R9 290, its seems more limited by core. Increasing core from 945 to 1050mhz gave me 850h/s with stock memory straps at 1500mhz mem. Also, this was way back, when the compute drivers still werent released.

can anyone help me with my msi rx 580 card 8gb  with samsung and hynix memory .cant get it to go to 30+ without errors on claymore tried to learn do it my self but was not successful downloaded jedec ddr5 file and other material on link in forum could not understand. where is tras value by the way only  tfc tcl trp trfc etc are shown in srbpolaris can seen . i have been trying for days i dont have background in software. any help will be appreciated 

my memory strap is
samsung k4g80325fb:
1500 - 555000000000000022CC1C00AD595B41C0570E14B00B450A0068C70003011420FA8900A00300000 0170E2B34A42A3116
1625 - 555000000000000022CC1C00CE616C47D0570F15B48C250B006AE7000B031420FA8900A00300000 0190F2F39B22D3517
1750 - 777000000000000022CC1C00106A6D4DD0571016B90D060C006AE70014051420FA8900A00300000 01B11333DC0303A17
2000 - 777000000000000022CC1C0031F67E57F05711183FCFB60D006C070124081420FA8900A00300000 01E123A46DB354019

hynix H5GQ8H24MJR
1500 - 999000000000000022339D00CE516A3E80551212B40B450A004AE400750314204A8900A00200712 4150F2A30A4283516
1625 - 999000000000000022449D00105A7B4480551312B88C250B004C0401750514204A8900A00200712 417112E34B22A3916
1725 - 999000000000000022559D0031627C4990551313BC0D060C004C04017D0714204A8900A00200712 419123138C02D3D17
2000 - BBB000000000000022889D0073EE8D53A055151743CFB60D004E24010E0A14204A8900A00300712 41C143840DB324418
2250 - BBB000000000000033BB9D00D6FEAF5EC05517174BD1770F005264011E0E14204A8900A00300712 420173F48F7384C1A

this is my rom if i messed up somehow above copying them manually https://drive.google.com/file/d/1BfGFmzANLC630SgTCw5UY2sCHl4SsctE/view?ths=true