Author Topic: Sapphire R9 280X Toxic OC can't get over 600 kh/s  (Read 7912 times)

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Offline williamj2543Topic starter

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Sapphire R9 280X Toxic OC can't get over 600 kh/s
« on: December 12, 2013, 12:43:18 AM »
Hey guys,
I'm  new to this forum and new to litecoin mining. I have been mining for the past day at around 575kh/s and I keep changing the config and I can't seem to get over that! Apparently the Sapphire Vapor-X can run about 760, and my car is OCed a bit more than that so I would expect over 800, but 575 is just crazy.
Here is my config:

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 0
cgminer.exe --scrypt -o stratum+tcp://mine-dgc.scryptmining.com:3388 -u MYUSERNAME -p DONTSTEALMYPASSWORD --thread-concurrency 14336 -I 13 -g 2 -v 1 -w 256 --lookup-gap 2 --shaders 2048 --gpu-memclock 1700 --gpu-engine 1200
Another question: I only edit all the settings in the .bat file, and If I delete the .conf file it doens't seem to do anything, and in the program I can print a .conf file with the above settings. What exactly does the .conf file do? If I just edit it will it automatically change the settings? Is it just a print-out of your current settings to past in forums?
Thanks guys,
William


Offline williamj2543Topic starter

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Re: Sapphire R9 280X Toxic OC can't get over 600 kh/s
« Reply #1 on: December 12, 2013, 01:32:30 AM »
Hey,
Turns out that I could fix it myself.
--FOR FUTURE USERS WITH THE SAME PROBLEM--
Most of the people with low hash rates with this video card actually are overclocking it too much. What I did is set the memory to 1700mhz, but I set the GPU engine to 1000mhz and adjusted from there. This is actually an underclock from the stock clock of 1150mhz, but for some reason a lower clock worked better. I am still tweaking all the settings, but if you want my perfected settings when I am done tweaking PM me and I will send my complete settings.
Thanks guys,
William

Offline Michele Lepri

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Re: Sapphire R9 280X Toxic OC can't get over 600 kh/s
« Reply #2 on: January 07, 2014, 04:59:57 PM »
Hi,
what's your final settings?
I was not able to go up 630 Kh/s.
I have a 650w psu: maybe this is the problem?

Offline gt306

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Re: Sapphire R9 280X Toxic OC can't get over 600 kh/s
« Reply #3 on: February 01, 2014, 03:43:35 PM »
I run at 1000 and 1500 with a tc of 8192....  I get almost 700...

Offline divxrullz

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Re: Sapphire R9 280X Toxic OC can't get over 600 kh/s
« Reply #4 on: February 01, 2014, 04:43:17 PM »
Hey dude, i was same problem. Please read this page - newbielink:http://rumorscity.com/2014/01/03/litecoin-mining-sapphire-radeon-r9-280x-sweet-spot-for-740khashsec/ [nonactive]
I made step-by-step instructions in order to undervolting my Toxic and now i got 740-750 with this settigns:


--thread-concurrency [/size]8192 [/size]-I 13 -g 2 -w 256 --lookup-gap 2 --shaders 2048 --gpu-memclock 1500--gpu-engine 1050
[/size]
just to mention that temp didn't exceed over 65 with Fan speed under 60% :)

Offline M3D3A

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Re: Sapphire R9 280X Toxic OC can't get over 600 kh/s
« Reply #5 on: February 05, 2014, 12:59:28 PM »
Check your version of CGMIner is 3.7.2. Had exactly the same issue when using Linux with an earlier version of CGMiner. I'm now getting +740KH/s per card with no under-volting done

 

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