Topic: Low hashrate on 7970 scrypt? Under 700Kh/s? Here's what to do... (Read 53756 times)

Hmm, if you are using Stilts' BIOS u can also try 1375MHz Mem and adjust core clocks accordingly.

If your card is throttling even at 73C check your VRM temperatures in GPU-Z, if that is hitting 90C+ that might be the problem. Try turn the Power Limit to -20% might help.

Keep in mind sometimes higher clock doesnt result the highest hashrate. go from 900 Core clock and add 10Mhz each time if hashrate goes up try bump 10 more until you hit the point where it start dropping or your card is running too hot. try to keep it under 80C

Adding a strong fan blowing directly at top of the card or the back of the card will reduce VRM temptures try that.

my 7970s run @ 1050/1500/1.087V

Joshwaa/iCrazyNoob,
I'd kill for 700kh/s average on my xfx r9 280x DD.  I'm averaging around 675 with throttling or even lower (630) with (non-throttling) clock speeds of 1020/1400. Everything fully cranked 1135/1500 @ 20 Intensity will get me almost 700kh/s, but it runs hotter, throttles every 20 seconds, and produces a lot more rejects.

I've tried just about everything.  Updated to the latest amd drivers (from 13.11), updated to cgminer 3.7.2, tried two of the Silts undervolted bios, created my own undervolted bios, tried a dozen or two different config files, tried bat file configurations, even tried linux (Ubuntu) all with no hash increase. The only things I havent tried yet are custom kernals (up to 20kh/s increase) and sgminer. 

Recently I've noticed quite a bit of throttling when they're running at 1100/1500 (currently undervolted to 1.144, anything lower and the card crashes when mining). I get less throttling at 1020/1500, and almost none at 1020/1400, but a much lower has hrate.  I've also noticed the MVDDC still seems quite high at 1.500 in gpu-z. Does that seem correct or should it be lower? Might that have something to do with the throttling? Atleast I'm running a bit cooler with it undervolted (regardless of throttle).

Any advice? Can/should I lower my mem vddc?

Someone mentioned using Trixx, Afterburner, gpu tweak, etc to stop throttling. If I lower the voltage just a little the card will usually crash.  Anything else I can do?

See my gpu-z and be7 image attached

Cheers,
- VR

Turns out the cards were fine. The Bios in the ASRock mobo did not like the new GPU Bios and would not boot because of that.  I updated the MOBO Bios and now all is good!

Use GPU-Z to check your VRM temperature, for mining you want to use as low voltage as possible that will greatly reduce VRM stress and power consumption.
When you are mining the first to overheat is your VRM if there is no steps taken to lower your voltage and additional cooling fans at the back of videocard.
most likely the reduced hashrate is because VRM overheat and throttling down the core speed.

Worst case scenario it will heat up to much your video card caches on fire. according to the stilt some XFX cards have really cheap VRM controller (analog instead of digital) to save cost.

You can use VBE7 to modify BIOS voltage or use software like MSI Afterburner to lower voltage. You can start by lower the powertune to -20%

Try this BIOS out:
http://www.mediafire.com/download/8dldldm58wxqrs2/MBA_C3860100-100_AGR_K2.rar
it should work well with any reference design card!
Same stuff as always 1500MEMCLK only and adjust core&voltage to your liking.

Sent you a lil something. I am running at 1020/1500/1.0v getting around 705khash/s

I also have 2 Sapphire reference 7970. Tried flashing that ASUS Bios and it bricked them. Love that BIOS switch.  If you have any ideas or Bios for those let me know. Thanks

good to hear, how much are you getting now with what clocks? I'm currently running 1050/1500 @ 730KHs. 1070/1500 can get me 750KHs for about 15 min and it lowers to 730 for some reason, so I just lowered clock to 1050 and it hashes 730KHs happily.
anything is appreciated

tip received thanks ! that was my first income since I started mining LOL.


EDIT: I found another Modded BIOS for the card going to try it out later when I get home today, will keep you updated! Happy mining
EDIT2: Well the BIOS I found pretty much perform on-par with the last BIOS i posted. I'm gonna try out 13.12 driver see if any difference with that.
EDIT3: 13.12 and 13.1 perform same. So I pretty much hit the ceiling for now at 730KHs/s on this powercolor reference.

iCrazy it seems it was the 12.8 Drivers causing the problem. I installed 13.1 and what a world of difference. Thanks so much for your help! Would you like a tip in DOGE or BTC?

I know it's a 7970 thread but ...

I hold a brilliant Sapphire Vapor-x 7950 (11196-09-40G). Unfortunately, memory that is installed on it is the "SK Hynix H5GQ2H24MFR" which with stock BIOS. I have a poor hashrate (tested a lot of settings, max 510kh/s) and the VRM are hot like hell while the GPU is at 69°C, which is correct. After some reading I came to the conclusion that I needed to recover a modified bios to solve this problem. But, as you certainly know The Stilt closed his thread on litecointalk. 

So I wanted to know if by luck one of you had the stilt bios for this card or a modified bios that can solve the problem. PM me please.

Otherwise, good luck with your 7970. 

Is that screen shot confirm it is the same bios you are using?

The one I posted above is my BIOS, Keep your mem clock at 1500
and adjust core from 1000 and higher I'd say for my card 1020/1500 - 1070/1500 is the best performing clocks.
Use AMD uninstaller to uninstall all drivers and download 13.1

Cat 12.8 <-- Could this be the problem?

I have the MFR Hynix. Could I get you BIOS iCrazyNoob?

Anyone got any ideas or suggestion / help for these please: 

I Have 2 x XFX R9-280x-TDFD / R9 280X 1000M BOOST 3GB D5

They have been clocking very stable at ~702Kh/s for 3 weeks ( GPU clock 1020, MEM clock 1500, 1200mv )
powertune 20. Using CGminer3.7.2 each card matching pretty much constant.

I have also had them run stable for over the last week at this ~725Kh/s ( GPU clock 1050, MEM clock1500, 1200mv )

Just the last 2 days one card has been dropping down to ~614Kh/s regardless of clock settings above and into the ~500KH/s at stock clock of GPU 1000, MEM 1500

It starts of ok for the first 15 mins where they both match then it drops off bouncing from 64% load to 99%load spending like most time between 64% and 70% load. approx. 580kh/s  - 615Kh/s THE OTHER CARD JUTS SITS STABLE 724Kh/s - 725Kh/s

I have ran several programs to check it, the only thing I have noticed during the tests and overclock programs is that the fan speeds reports they are only spinning the fan at 70% of the other card even when it reports 100% in test programs it shows actual rpm of the other cards saying 70%.

So while 1 can spin 3150RPM at 85%     the other card reports 2800RPM at 100%

OR there is a bit of give and take on the figures below +/_  of 25 - 50  I just took averages.

GPU0 Fan speed ~100% =RPM 3150   GPU0 Fan speed ~85% =RPM 3150   GPU0 Fan speed ~75% = RPM 2850        
GPU1 Fan speed ~100% =RPM 2800   GPU1 Fan speed ~85% =RPM 2800   GPU1 Fan speed ~75% = RPM 2500

I have swapped the cards round in there pcie x16 sockets and it makes no difference.

I have tried running in both CGminer 3.7.2 and SGminer4.0

In both programs the same card is down in KH/s on what it normally is, while the other runs same as always. They are only 4 weeks old.

Any Ideas, advice  or suggestions would be welcomed ?

Thanks Axco

you have the AFR vram which according to The Stilt has the correct timing built in. I got the MFR which is the rubbish timing. But I already got a modded bios which can get me 750KHs so I'm good! But thanks.

I can actually get a little over 700kh/s on my Powercolor without flashing it
use the mem and clock tuning in cgminer and set it to 1020/1450
and i use the same config in scrypt as you do
heres some info on the card i have
if you like i can send a copy of my bios..

PowerColor Card
GpU-Z
015.032.000.002.000000 (113-C3860100-100)

Tahiti indentifier- HD 7970 (SK Hynix H5GQ2H24AFR)

lol really only 4? what settings have u tried and what drivers are you running?
also give me a screenshot of the flashed card with gpu-z

shouldnt matter.

One thing. I was going to try this but I thought the bios should be a .rom file not a .bin?


Edit:  tried it. Flash worked. But only gained 4khash/s. wtf

Update for ya, I found a ASUS 7970 bios modded by The Stilt that can boost my card up to around 711KHs. I'm still testing the stability will keep u informed very soon, still finding the highest hash rate so far.
Also I changed my minier to sgminer 4.1.0 as that's the newest miner available, Driver still 13.1. script:

EDIT: also when your increasing your core clock and hash rate goes up that's a good sign, keep going up til u hit the point where it DROPS. and that last clock where it didn't drop is the sweet spot.

EDIT2: After a few hours of tuning I have gotten my card to run at 750KHs @ 1070/1500/-20% Power tune/80% Fan @ 73C. Gotta say I'm pretty satisfied. The card seems to be able to handle even higher speed but I'm playing it safe as 1070 is already fairly high clock.

For this BIOS MEM CLK stays @ 1500 as specified by The Stilt due to the BIOS contains modified CL timing. Just raise your clock from 1000 with 10 increment til it either drops or if temp is reaching GPU ~80C /VRM ~90C. My still goes up even after 1070 But like I said, I want choose this place to stop at around 750KHs for safety.

BIOS:
https://www.dropbox.com/s/cgaaubvsnw9uh0w/7970MOD.bin

HP USB Disk Storage Format Tool:
http://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html
WIN98 Boot:
http://www.bay-wolf.com/utility/usbkey/win98boot.zip
ATIFLASH 4.17:
http://www.techpowerup.com/downloads/2306/atiflash-4-17/

If you don't know how to flash heres the post where I learned it:
http://forums.guru3d.com/showthread.php?p=4503953

PS: My card is Powercolor AX7970 3GBD5-M2DHV2, with SK Hynix H5GQ2H24MFR VRAM Chips. Have the reference AMD red/black Turbine cooler.
PSS: when you are putting the atiflash.exe in the usb its easier to name it shorter as DOS tend to shorten it as ATIFLA~1.exe which is a PITA to type.
PSSS: back up your current BIOS from GPU-Z and name it 7970Ori.rom so you can flash back in case of failure. Flash the BIOS 1 on the card. the switch is near the CF bridge.

Hope this helped you! I'm still waiting to sell my gaming machine for money so I can get a mobo that can run all 3 of my cards together haha. Right now only one card its sitting in this old HP machine with AMD 4600+, 4GB DDR2 533 RAM and an Antec 450W PSU and it still hashes 750KHs without a sweat xD

I have gone from 900 to 1100 on my gpu clock. It just slowly increases each time i move it up. No sweet spot no big jump at any spot. Really weird if you ask me.

 I am now at 1100/1575/1.102v and getting 596khash/s