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Gigabyte 280X Rev2 Undervolting ?

post #1 of 35
Thread Starter 
So I currently have 2x R9 280X Gigabyte Rev2 and Its running at 700w just the 2 of them. My problem is I wanna run 4 GPUs but the gpu itself is voltage locked. Does anyone know how to unlock the voltage in windows 7?
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post #2 of 35
I have 2 of these GV-R928XOC-3GD.
You will need to update your vBois with new voltages.

Use this guide.

http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/

Also you should get 740 from these cards, (With updated BOIS and Scrypt) 720 Stock.

(CrossFire)
-I 13 -w 512 --lookup-gap 2 --thread-concurrency 8192 -g 2 --gpu-engine 1045 --gpu-memclock 1500

(Non-CrossFire)
-I 13 -w 64 --lookup-gap 2 --thread-concurrency 8192 -g 2 --gpu-engine 1045 --gpu-memclock 1500

I'm including my updated BOIS with new memory timings and Undervolted.

Also, a updated scrypt130511.cl for your miner.
Close Miner, Delete all BIN files, Copy in new Scrypt130511, Open Miner

Both of these should greatly help you out.
GV-R928XOC-3GD.zip 111k .zip file
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post #3 of 35
Thread Starter 
I'm kinda confused why is it only -w 64 on non crossfire and will be flashing my gpus tonight and mind sharing me what Concurrency actually do. Coz all ive been doing is going up and down by a lil till I get my best settings. I use to run it at 11200 but soo mch HW on 1 card and the other has 0. So I'm now at 8912 with no hardware error.
Edited by H Allen - 1/24/14 at 12:06pm
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post #4 of 35
Thread Starter 
My current settings is -I 13 -w 64 --lookup-gap 2 --thread-concurrency 8921 -g 2 --gpu-engine 1049 --gpu-memclock 1500 runs at 730. I tried ur settings only 720 for me.
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post #5 of 35
Witch miner are you using? I use MutliMiner.


This is what the README says in BFGMiner.

--thread-concurrency:
This tunes the optimal size of work that scrypt can do. It is internally tuned by BFGMiner to be the highest reasonable multiple of shaders that it can allocate on your GPU. Ideally it should be a multiple of your shader count. VLIW5 architecture (R5XXX) would be best at 5x shaders, while VLIW4 (R6xxx and R7xxx) are best at 4x. Setting thread concurrency overrides anything you put into --shaders and is ultimately a BETTER way to tune performance. SUMMARY: Spend lots of time finding the highest value that your device likes and increases hashrate.

TC is more like a magic number, My understanding it has to do with shaders. Our cards have 2048 shaders. 2048 * 4 = 8192 so this is the ideal number you should get best rate with. But I'll do some testing and post my results.


All tests are 5min Runs only changing TC.

I increased by 64 per test.

0. 8192 - Ave = 1.492 MHS = 746.0 Per device
1. 8256 - Ave = 1.465 MHS = 732.5 Per device (-13.5)
2. 8320 - Ave = 1.419 MHS = 709.5 Per device (-36.5)
3. 8384 - Ave = 1.476 MHS = 738.0 Per device (-8)
4. 8448 - Ave = 1.376 MHS = 688.0 Per device (-58)
5. 8512 - Ave = 1.443 MHS = 721.5 Per device (-24.5)
6. 8576 - Ave = 1.395 MHS = 697.5 Per device (-48.5)
7. 8640 - Ave = 1.448 MHS = 724.0 Per device (-22)
8. 8704 - Ave = 1.344 MHS = 672.0 Per device (-74)
9. 8768 - Ave = 1.463 MHS = 731.5 Per device (-14.5)

Now I will increase by 1
0. 8192 - Ave = 1.492 MHS = 746.0 Per device
1. 8193 - Ave = 1.473 MHS = 736.5 Per device (-9.5)
2. 8194 - Ave = 1.348 MHS = 674.0 Per device (-72)
3. 8195 - Ave = 1.468 MHS = 734.0 Per device (-12)
4. 8196 - Ave = 1.353 MHS = 676.5 Per device (-69.5)
5. 8197 - Ave = 1.466 MHS = 733.0 Per device (-13)
6. 8198 - Ave = 1.349 MHS = 674.5 Per device (-71.5)
7. 8199 - Ave = 1.471 MHS = 735.5 Per device (-10.5)
8. 8200 - Ave = 1.363 MHS = 681.5 Per device (-64.5)
9. 8201 - Ave = 1.468 MHS = 734.0 Per device (-12)

Now I will decrease by 1
0. 8192 - Ave = 1.492 MHS = 746.0 Per device
1. 8191 - Ave = 1.471 MHS = 735.5 Per device (-10.5)
2. 8190 - Ave = 1.472 MHS = 736.0 Per device (-10)
3. 8189 - Ave = 1.469 MHS = 734.5 Per device (-11.5)

I think this shows all the data that is needed,... 2 hours of testing
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post #6 of 35
Thread Starter 
I use CGMiner and I tried that 8192 but I get 1 gpu around 650 and the other at 720. My most stable for both 720 and 730 is 8193 1049 gpu engine i13 w256 memclock 1500
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post #7 of 35
Are you using crossfire?
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post #8 of 35
Thread Starter 
Nope. All single. currently waiting for x3 unpowered and x1 powered x16 risers so I can run 4. But i'll probably end up running 3 unpowered since I am not successful on undervolting my cards.
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post #9 of 35
The bois update didn't work?, did you use the attached bois I posted? Did you update from DOS?
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post #10 of 35
Thread Starter 
Well it starts on a low voltage and then all of the sudden runs up to 1.2 again when I started mining. What is the voltage on your BIOS? I'll try doing it again tommorow on a different card since I have 4.
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