XFX Radeon HD 7870 - Unable to overclock, no shares submitted - .1 BTC bounty

[Wolf0]

NaN.

[MrWizard]

1) Try increasing thread-concurrency ( use multiples of 1536). 

or

2) use: --shaders 1536 -I 17  instead of:  --worksize 256 --gpu-threads 1 --intensity 18 --thread-concurrency 3328

finally, try: -d 0 (explicitly states which device to use, in case it's somehow confused)

[MrWizard]

The number next to HW is now incrementing, but no accepted shares

HW is hardware errors.  Try decrementing I (intensity) until you get no HW errors.

[MrWizard]

Okay, submitting shares with the following config:

Code:

C:\Users\Wolf\Desktop\CGMiner\cgminer.exe --scrypt --gpu-platform 1 --failover-only --url stratum+tcp://us.wemineltc.com:80 --url stratum+tcp://coinotron.com:3334 --userpass Wolf0.worker1:gpugpu01 --userpass Wolf0.worker1:gpugpu01 --shaders 1536 -I 12

Now, I need to be able to overclock. Any help with the cgminer errors? Also, can I get more kh/s out of this card without overclocking? (--thread-concurrency, --gpu-threads?)

Now that you know that the card works using the --shaders parameter you can swap out --shaders and use a combination of:--worksize xxx --gpu-threads x --intensity xx --thread-concurrency xxxx

You can experiment with various values to optimize performance, but i found for my 7750 that worksize 256 is good, --gpu-threads 1 or 2 is good, --intensity (higher is not better!) too high and you overwhelm the card with work, --thread-concurrency (this is the money maker, use multiples of shaders.  Not too low or you will get no results, too high and you are asking the card to use more memory than the card has.  Use someting in the order of 4 to 6 times shaders)

As for overclocking I have used MSI afterburner for years with success.  Have not used cgminer's --gpu-engine <arg>, --gpu-memclock <arg> parameters.  Might be useful for you to try.  READ THE readme.txt supplied with cgminer.

Have I forgotten anything else?

[MrWizard]

Turns out I need intensity at 11 for no HW errors. It works, but it's mining extremely slowly. I expected a max of 400kh/s out of this card!

Are you using the --shaders xxxx method?  That will work, but you are asking the card to make a best guess at the best parameters to use.  Now try --worksize xxx --gpu-threads x --intensity xx --thread-concurrency xxxx to hand optimize.

[MrWizard]

Now that you are up and running I would like to claim the bounty!

[MrWizard]

Now that you are up and running I would like to claim the bounty!

I'll send it to the address in your sig, but I still need help with overclocking

Thanks.  And as I said before I use MSI afterburner for overclocking.

Manually tuning --thread-concurrency, and -I  instead of --shaders, even using --gpu-engine <arg> to set the GPU clock with cgminer are somethings worth trying.

I was also thinking that because you have placed the XFX as a third PCI Express card into your motherboard that the slot might not be running at the full x16 speed.

There are also other hardware issues that could be involved.  Overheating, GPUs clock somehow set low, ...

[Simran]

The 2 monitors is your problem! Disconnect one.

[MrWizard]

I'm sure he means disconnect one monitor from the GT 430  
You can reconnect it you find that you can overclock the Radeon.

[BitHits]

I use the following settings. Its very stable. Not a 78xx but a 57xx

Code:

--scrypt --gpu-threads 2 --shaders 800 --thread-concurrency 2400,2400 -I 9 --auto-fan --auto-gpu --round-robin --gpu-engine 150-725 --gpu-memclock 300-1200 --gpu-fan 70-100 --verbose --temp-target 72 --temp-overheat 78 --temp-cutoff 84 -w 256

The temp management in CGMiner is key... Also the -I setting can drastically improve or hinder your preformance. around -I 15 is a sweetspot for my card. Extremely high MHash even GHash! and then drops off. -I 14 gives much more stable results. even with the -I 15 and reports of GHash/sec (on BTC, not LTC) the actual rate reported by the pool and the average in client is about 200-300MHash a sec, which is not bad at all from my 'stable' 160MHash

LTC Performance with above settings for me is like 60-80Khash, but its a 2 generation older card then yours

[Moebius327]

Have you found a solution to this?

[nickwen]

Hello

Nvidia & ATI can't use in same time

make a bat file like
for nvidia try this one

Pool_nvidia.bat
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --scrypt  -I 13 -o URL:Port -u username -p password --gpu-platform 0 -d 0  -w 256

Pool_ATI.bat  
for ATI try this one
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --scrypt  -I 13 -o URL:Port -u username -p password --gpu-platform 1 -d 0 -w 256  -g 1  --thread-concurrency 8192

and overcolock you can try it in the DOS Command Box

if works you can try -g 1 to -g 2 and -i upto 16  keep trying find your best setting

thank you

MY BTC Add  
14QExrNJB3R6oMYLFRVsQd1esRZUhMMycY

[palm12341]

Have you tried basic overclocking with overdrive in CCC or amd VISION control center?
My xfx 7870 gets to about 1150 clock and 1250 mem clock with 12% power

[hendo420]

sapphire trixx is the best "work every time" overclocking solution I have tried.

If trixx doesn't work, ditch the nvidia card, its whats causing your problems.

Sell the nvidia card and buy another AMD.