Bitcoin Forum

Hey guys as the post says I have an AMD Radeon HD 6870 and I was wondering if anybody on here can sort of guide me
or point me in the right direction so that I can use my graphics card to mine Litecoins?

download Cgminer

then you want to open command line to where you have put CGMINER.

then type cgminer -o  address:port -O Username:password  --thread-6720 --gpu-threads 1 --intensity 18 --lookup-gap 2 --worksize 64 --no-submit-stale --auto-fan --temp-target 75 --gpu-engine 1050-1050 --gpu-memclock 1150

Lower the Intensity if you still want to use the PC while running


Change Address for the Address of the litecoin pool, and port for the port

You may also want to look into GUIMiner, it's as simple to use as they come: https://bitcointalk.org/index.php?topic=150331.0 (https://bitcointalk.org/index.php?topic=150331.0)

Be sure to join a pool first, some examples are Coinotron or notroll.in, and read their Help pages. Good luck!

Ok I already downloaded CGMINER I then created a folder on my desktop labled cgminer and extracted the zip file onto there. Then I clicked on the unziped folder and in the folder I clicked on "cgminer" as it was an application and then the command prompt asked me to put the url which I put http://litecoinpool.org:9332

I got the 9332 from some guy on youtube that was sort of showing people how to do this. Is the 9332 the accurate number? How would I figure out?

Then it asked for my username and password I put that and hit enter.
Now it looks like its mining.

However, I don't quite know what this stuff means?
 
(5s):249.3M (avg):249.0Mh/s | A:0  R:19  HW:0  U:0.0/m  WU:3.5/m
 ST: 2  SS: 0  NB: 9  LW: 120  GF: 0  RF: 0

 Connected to us.litecoinpool.org diff 2 with stratum as user *******

 Block: a7b7a60954133369...  Diff:234  Started: [19:52:50]  Best share: 53
--------------------------------------------------------------------------
 [P]ool management [G]PU management ettings [D]isplay options [Q]uit
 GPU 0:  69.0C 1300RPM | 248.9M/250.5Mh/s | A:0 R:19 HW:0 U:0.00/m I: 4
--------------------------------------------------------------------------

 [2013-04-09 19:49:11] Rejected 04cbb43c Diff 53/2 GPU 0  (target-miss)
 [2013-04-09 19:49:23] Rejected 0a7ee6d0 Diff 24/2 GPU 0  (target-miss)
 [2013-04-09 19:49:29] Rejected 56a5c7ac Diff 2/2 GPU 0  (target-miss)
 [2013-04-09 19:49:29] Rejected 263fc423 Diff 6/2 GPU 0  (target-miss)
 [2013-04-09 19:50:13] Stratum from pool 0 detected new block
 [2013-04-09 19:50:59] Stratum from pool 0 detected new block
 [2013-04-09 19:51:12] Rejected 3b40c937 Diff 4/2 GPU 0  (target-miss)
 [2013-04-09 19:51:31] Rejected 4380b31d Diff 3/2 GPU 0  (target-miss)
 [2013-04-09 19:52:18] Stratum from pool 0 detected new block
 [2013-04-09 19:52:48] Rejected 54475c56 Diff 3/2 GPU 0  (target-miss)
 [2013-04-09 19:52:50] Stratum from pool 0 detected new block
 [2013-04-09 19:52:50] Rejected 62772a4e Diff 2/2 GPU 0  (target-miss)
 [2013-04-09 19:53:20] Rejected 2801558e Diff 6/2 GPU 0  (target-miss)


can someone sort of help me understand what the heck this means exactly haha

Also, is 248.9M/250.5Mh/s accurate? Does that mean my AMD Radeon  HD 6870
is doing 250 MEGA Hashes per second? Or should it be Kilo Hashes?

If you want LTC you need to put in:

  --scrypt

into the cgminer.

eg: cgminer --scrypt -o  address:port -p Username:password  blah blah

Megahash is correct for SHA256 (such as bitcoin) but for LTC you should be getting 100's KHash

Edit: I put in --algo scrypt rather than --scrypt... was thinking of minerd (it's late!)

Ok, you're doing litecoin :)  so you need 1 more command

 
cgminer --scrypt -o  address:port -O Username:password  --thread-6720 --gpu-threads 1 --intensity 18 --lookup-gap 2 --worksize 64 --no-submit-stale --auto-fan --temp-target 75 --gpu-engine 1050-1050 --gpu-memclock 1150



Normally if you look at the help section for the pool you want to mine. They will tell you the address etc

do I just type that in the command prompt that is up and running right now? Obviously I'd also include my username and password where it says it right?

right, or just copy and paste :) and correct the area that need it.

ok thank you so much :)

Hi guys, I have the same GPU and this morning, after about half an hour my LinQ P4 500W exploded. Is it normal? Do I need a bronze one?

just calculate the max wattage for your cards + 150W for rest of your setup and you should be safe.

you can always check out the litecoin mining hardware comparison page for info on wattage of cards.

take max numbers.