New Posts  All Forums:Forum Nav:

7xxx Series Thread

post #1 of 4
Thread Starter 
I don't see a thread for these cards atm and with all the media attention crypto's are getting I see a large influx of new miners joining the pools. Even with the new R9 series cards coming out, i'm sure these cards are still going to be used quite a bit so I thought we could get a thread going to help each other fine tune our mining settings and share our results.


I'm currently mining Litecoin on a HIS 3GB 7970 card, reference cooler. I use CGMiner 3.6.6 and i've got my card tuned to ~750 Kh/s atm. Haven't touched voltages, just bumping up the memory clock and keeping the core clock at a .6 ratio, which seems to be the magic ratio for 7970's, not so sure about the others.

Here's what my batch file looks like atm w/ a few notes.
Code:
cgminer --scrypt -o <url> -u <worker> -p <pass> -I 13 -w 256 -g 2 --gpu-engine 1080  --gpu-memclock 1800 --lookup-gap 2 --shaders 2048 --thread-concurrency 10240 --auto-fan


::gpu-memclock *.06 = gpu-engine (1080*.06 = 1800)

::7970 Shaders = 2048

::Thread Concurrency - delete all .bin files in your cgminer folder then run without --thread-concurrency in your batch 

file, then look at the new .bin file cgminer creates. You'll see tc followed by numbers. cgminer automatically attempts 

to find the most efficient thread concurrency for your card, and this is the result that it finds. You can either use 

it, as I have to positive results, or you can start at 8192 and work your way up. Any lower than 8192 may cause 

instability.

Screenshot.


I'll try and post some useful links as well. I'm still coming across stuff myself, so so I'll post it as I find it.

https://litecoin.info/Mining_hardware_comparison - Wiki w/ tables and example settings other users have had success with

https://bitcointalk.org/index.php?topic=117221.0 - huge guide thread for 5, 6 and 7xxx series cards. Highly suggest reading a few pages if you're new. Tuning is everything.

I've noticed a few versions of CGMiner i've tested didn't have the scrypt readme with the 7970 tuning info in it so here it is. Tuning a 7970 (Click to show)
Example tuning a 7970 for Scrypt mining:

On linux run this command:
export GPU_MAX_ALLOC_PERCENT=100
or on windows this:
setx GPU_MAX_ALLOC_PERCENT 100
in the same console/bash/dos prompt/bat file/whatever you want to call it,
before running cgminer.

First, find the highest thread concurrency that you can start it at. They should
all start at 8192 but some will go up to 3 times that. Don't go too high on the
intensity while testing and don't change gpu threads. If you cannot go above
8192, don't fret as you can still get a high hashrate.

Delete any .bin files so you're starting from scratch and see what bins get
generated.

First try without any thread concurrency or even shaders, as cgminer will try to
find an optimal value
cgminer -I 13

If that starts mining, see what bin was generated, it is likely the largest
meaningful TC you can set.
Starting it on mine I get:
scrypt130302Tahitiglg2tc22392w64l8.bin

See tc22392 that's telling you what thread concurrency it was. It should start
without TC parameters, but you never know. So if it doesn't, start with
--thread-concurrency 8192 and add 2048 to it at a time till you find the highest
value it will start successfully at.

Then start overclocking the eyeballs off your memory, as 7970s are exquisitely
sensitive to memory speed and amazingly overclockable but please make sure it
keeps adequately cooled with --auto-fan! Do it while it's running from the GPU
menu. Go up by 25 at a time every 30 seconds or so until your GPU crashes. Then
reboot and start it 25 lower as a rough start. Mine runs stable at 1900 memory
without overvolting. Overvolting is the only thing that can actually damage your
GPU so I wouldn't recommend it at all.

Then once you find the maximum memory clock speed, you need to find the sweet
spot engine clock speed that matches it. It's a fine line where one more MHz
will make the hashrate drop by 20%. It's somewhere in the .57 - 0.6 ratio range.
Start your engine clock speed at half your memory clock speed and then increase
it by 5 at a time. The hashrate should climb a little each rise in engine speed
and then suddenly drop above a certain value. Decrease it by 1 then until you
find it climbs dramatically. If your engine clock speed cannot get that high
without crashing the GPU, you will have to use a lower memclock.

Then, and only then, bother trying to increase intensity further.

My final settings were:
--gpu-engine 1141 --gpu-memclock 1875 -I 20
for a hashrate of 745kH.

Note I did not bother setting a thread concurrency. Once you have the magic
endpoint, look at what tc was chosen by the bin file generated and then hard
code that in next time (eg --thread-concurrency 22392) as slight changes in
thread concurrency will happen every time if you don't specify one, and the tc
to clock ratios are critical!

Good luck, and if this doesn't work for you, well same old magic discussion
applies, I cannot debug every hardware combo out there.

Your numbers will be your numbers depending on your hardware combination and OS,
so don't expect to get exactly the same results!

Edited by Shiveron - 11/26/13 at 9:26am
post #2 of 4
http://www.overclock.net/t/1196856/official-amd-radeon-hd-7950-7970-7990-owners-thread
http://www.overclock.net/t/1231670/official-the-amd-radeon-7800-owners-club

Im sure many can help you there thumb.gif

Good info though no reason a discussion cant be started elsewhere smile.gif
Intel Overclocker
(12 items)
 
Media PC
(8 items)
 
 
CPUMotherboardGraphicsRAM
Intel i7 4790k Delidded + Lapped ASRock Z97 Extreme4 MSI Twin Frozr GTX 660  Corsair Vengeance Pro 2400mhz DDR3 
Hard DriveHard DriveOptical DriveCooling
OCZ Deneva 2 R series 400GB SSD WD Green 4TB HDD Asus DRW-24B1ST Phanteks PH-TC14PE_RD 
OSPowerCaseMouse
Windows 10 Seasonic 650w M12II Phanteks Enthoo Pro M with Acrylic side Cobra e-blue 
CPUMotherboardRAMHard Drive
intel core 2 quad q8200 Dell studio stock Dell studio Stock Corsair Force 3 SSD 
Hard DriveOptical DriveCoolingOS
External powered Seagate expansion desk Dell studio stock Stock Windows 10 
CPUMotherboardGraphicsRAM
FX-8350 GA-990FXA-UD5 MSI 7870 Hawk Edition Gskill 1600 2x4 GB 
Hard DriveOptical DriveCoolingOS
Corsair Force Series 3 22x Samsung w/ lightscribe dvd/cd burner Noctua NH-D14 Win 7 pro x64 
MonitorPowerCase
Acer x173w Seasonic M12II 650watt Semi-Modular PSU Apevia x-dreamer4 (with side window and red) 
  hide details  
Reply
Intel Overclocker
(12 items)
 
Media PC
(8 items)
 
 
CPUMotherboardGraphicsRAM
Intel i7 4790k Delidded + Lapped ASRock Z97 Extreme4 MSI Twin Frozr GTX 660  Corsair Vengeance Pro 2400mhz DDR3 
Hard DriveHard DriveOptical DriveCooling
OCZ Deneva 2 R series 400GB SSD WD Green 4TB HDD Asus DRW-24B1ST Phanteks PH-TC14PE_RD 
OSPowerCaseMouse
Windows 10 Seasonic 650w M12II Phanteks Enthoo Pro M with Acrylic side Cobra e-blue 
CPUMotherboardRAMHard Drive
intel core 2 quad q8200 Dell studio stock Dell studio Stock Corsair Force 3 SSD 
Hard DriveOptical DriveCoolingOS
External powered Seagate expansion desk Dell studio stock Stock Windows 10 
CPUMotherboardGraphicsRAM
FX-8350 GA-990FXA-UD5 MSI 7870 Hawk Edition Gskill 1600 2x4 GB 
Hard DriveOptical DriveCoolingOS
Corsair Force Series 3 22x Samsung w/ lightscribe dvd/cd burner Noctua NH-D14 Win 7 pro x64 
MonitorPowerCase
Acer x173w Seasonic M12II 650watt Semi-Modular PSU Apevia x-dreamer4 (with side window and red) 
  hide details  
Reply
post #3 of 4
Thread Starter 
I figured coin mining belonged in distributed computing vs graphics discussion
post #4 of 4
If you use --thread-concurrency it overwrites whatever you have in --shaders

Either use one or the other but not both
Truck
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2700K Intel DP67BG SLI 2x Zotac 570 Reference 16GB G.Skill 1600MHz / 1.25v 
Hard DriveOSMonitorKeyboard
WD 2TB / OCZ Solid3 128GB Vista Pro 7 x64 / Ubuntu 22.5" Acer LCD Dollarstore special 
PowerCaseMouse
OCZ Z-Series 1000w Coolermaster HAF 922 w/ 5x YL high speeds Logitech with red light camera laser 
  hide details  
Reply
Truck
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2700K Intel DP67BG SLI 2x Zotac 570 Reference 16GB G.Skill 1600MHz / 1.25v 
Hard DriveOSMonitorKeyboard
WD 2TB / OCZ Solid3 128GB Vista Pro 7 x64 / Ubuntu 22.5" Acer LCD Dollarstore special 
PowerCaseMouse
OCZ Z-Series 1000w Coolermaster HAF 922 w/ 5x YL high speeds Logitech with red light camera laser 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Distributed Computing - General