Topic: Please help with HD6870 Settings (Read 869 times)

Heya,

I like you was having some issues getting things going. I have both a Sapphire R9 270 and an XFX HD6870. My biggest issue was the 270. still have not gotten that straight ye. I think more can be squeezed out of it than the 210Kh/s

For you though, the 6870 I have going is running at 140Kh/s to 150Kh/s average. I am also not getting Any HW errors at all and it has been running for 26 hours now.  The first thing I would have to say is to download "thekev vertminer" from https://bitcointalksearch.org/topic/ann-new-thekev-vertminer-ultimate-vertminer-guide-for-windows-466867

This solved quite a few issues for me, as the 0.5.3 was not letting my cards really work as they should (270 issues)

here is the Bat

and here is the Config

as You can see above, the rawintensity setting is a large number, but it seems to work without any issue. I have the gpu sitting at stock settings with the exception of the fans being pushed to 100 to keep it cool. GPU settings are gpu = 900 mem=1050. May play around with an overclock once my new case fans arrive. Also Note that the worksize is at 128. it can not be higher for the 6870 I have found. The Miner will not start if it is. Also with the random low hashrates, I have that issue as well sometimes. I generally just Logout of windows and log back in and all is good again. I do not thing it is an uncommon issue.

Hope this helps some. I am still playing with it, but the hashrate is not bad at all I think for a 6870

anyone please?

bump
jjfg

Hey I have an HD6870 and am mining vertcoin (so the kh is half of other coins I believe)

So far, I can get 100kh with the following settings:

vertminer.exe --scrypt-vert -o stratum+tcp://xxxxxxxx -u xxxx.xxxxx -p x --thread-concurrency 4480 -I 13

If I turn up my intensity, I can get it up to about 140 but the GPU gets way too hot (like 80-85 degrees)

Others have suggested that I play around with the thread concurrency in multiples of 64 but if I put anything other than 4480 in, my speed drops to 18kh

I tried it at the following tc levels and every one of them drops the speed top about 18kh:
5760, 6400, 8192 ,6720

Also, sometimes I notice after I close and start up the miner later that even my 4480 (that I get 100kh) with will drop to 15-18 until I restart my computer.  Unfortunately, trying these other thread-concurrencys after a fresh restart doesn't do anything to raise the kh

I am confused why this happens to even my good settings and if its related to my issue of other tcs never getting over 20kh.

Any advice on this or how I can get it more up to the 125-130 range while keeping my GPU temp down would be greatly appreciated.

Thank you