Author Topic: 2x Sapphire R9 280X OC Dual-X 3GB mining NEED HELP  (Read 11335 times)

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Offline RDLTCTopic starter

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2x Sapphire R9 280X OC Dual-X 3GB mining NEED HELP
« on: December 07, 2013, 11:52:16 AM »
Hi guys,

I just got a new system, been running for two days (testing), the thing is that the rig is in a nice box good cooling but I can´t get more than
700kh/s in the second GPU, while the first is always at a higher temp (10c more aprox) and mining at 600k/s, I don´t know what to do
researching I found that these cards could support up to 800kh/s (not asking for that much but at least 700 each would be nice).

This is my rig:

- AMD Athlon II Dual Core 3GHz
- Motherboard Asus M5A99FX Pro R2.0
- Supply Corsair AX860i Plus Platinum
- 2x4GB Kingston HyperX Genesis DDR3
Everything inside a Zalman Z11 plus tower and running cool (have it open both sides)

This is my cgminer config:

color 02
cgminer --scrypt -o stratum+tcp:// -u x.x -p x --lookup-gap 2 --thread-concurrency 8192 -g 2 -I 13 -w 256 --auto-fan --gpu-fan 90,90 --temp-cutoff 90,90 --temp-overheat 85.85 --temp-target 72,72 --gpu-memclock 1490,1490 --gpu-engine 1060,1060 --gpu-powertune -20,-20 --expiry 1 --scan-time 1 --queue 0 --no-submit-stale

At the moment just runnuing this in a .bat file, no config file.
Tried without TC and it seemed to get 700kh/S each but after a while it will go down to 600 the first and 700 the second (i am using crossfire system)

Is it a temp issue??I post my cgminer window as well I think they can run a lot higher in temp.

newbielink: [nonactive]

newbielink: [nonactive]

Thank you if you can help!

Offline Crypto Coin

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Re: 2x Sapphire R9 280X OC Dual-X 3GB mining NEED HELP
« Reply #1 on: December 13, 2013, 07:52:46 PM »
I'm getting about 730kh/s on these cards.  Try these updates:

--gpu-memclock 1500 --gpu-engine 1050 --gpu-powertune 5

Offline Rosta32

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Re: 2x Sapphire R9 280X OC Dual-X 3GB mining NEED HELP
« Reply #2 on: December 21, 2013, 01:38:25 PM »
I've only been doing this for a few days, but I found my issues with the Dual-X to be related to heat.  With a stock vddc I'd only get 550 kh/s no matter what settings I tried.  After undervolting to 1.09 via bios flash I got 710 kh/s which dropped down to 600 kh/s within a few minutes.  Directing an oscillating fan (low speed) at the card lets me run consistently 710 kh/s at 73C.  [size=78%]I have more tuning to do with vddc and clocks, but I suggest experimenting with heat control.[/size]

Found this post extremely helpful:  [/size][size=78%] newbielink: [nonactive][/size]
My settings: ./cgminer --scrypt -I 13 -w 256 -g 2 --thread-concurrency 8192 --gpu-engine 1030 --gpu-memclock 1500 --gpu-powertune 20 --temp-target 75 --temp-overheat 85 --temp-cutoff 90 --auto-fan


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