Changing the hashing algorithm

lizhi

I use AMD 14.4 Catalyst + SDK 2.9 .

Can you mine with AMD 13.4 Catalyst + SDK 2.8 ?

tmuir12

I could mine with just AMD 13.4, I didn’t have SDK installed at all, although I now have installed SDK 2.9.

I have a Gigagbyte HD7870 GPU, running Windows 7 64 bit

Flobdeth

There have been known mining issues with 14.4 since release, 13.12 max on windows.

lizhi

The best choice:

AMD 13.12 Catalyst + SDK 2.9

AMD 7850 CARD =48Khash/s ;

AMD 7970 CARD =16Khash/s ;

cgminer.exe --neoscrypt --fix-protocol -I 12,12 --worksize 256,384 --thread-concurrency 8192,8192 --shaders 1024,2048 -g 1 -o http://pool.ftc-c.com:19328 -u TRsuTqxAMKZNvC7JzGNgvM49rkQNcxqjhi -p x

daimyo

I gave it a try last night on my nVidia 550M, Win7 and I got max 8 khs. Mostly default settings, --worksize 256 -I 13, no overclock. Driver version 294.10 - a bit old

76C gpu temp -> not bad

I think it can reach up to 10 khs with some tweakin

This is what i get with -I 14

Limitation of the gpu?

And whats the logic 7850 to perform 3 times faster than 7970?

Do you guys expect the stratum implementation to raise the productivity significantly?

tmuir12

Try dropping the intensity I am using 11 on my 7870, on I 12 it drops performance by half, and on 14 I would probably only get around 8 too.

For normal Scrypt I 12 is the sweet spot for me but 11 is required for Neoscrypt

kris_davison

Is there anything special you needed to do to get cgminer working with nvidia?

daimyo

Is there anything special you needed to do to get cgminer working with nvidia?

absolutely nothing… works right outta the box. I am curious to see what a decent desktop nvidia could do

Lukey_p

i have a GTX780Ti clocked at 1Ghz i could give a bash?

Anywhere i should get all the files from? Thanks

kris_davison

ive got three 750ti cards in a rig at home I may have a try and get this miner up and running with them.

Wellenreiter

I have one 750Ti and get about 35khash reported by the miner with default settings, just I=10
If I set intensity to a higher value, hw errors increase.
By the way, the pool reports about 24 khash only, but no errors.

Some hashes ‘lost in transit’? ;)

daimyo

Wellenreiter, do we need external help with the stratum? Do you think it would increase productivity?

I can get my 550M to work up to I-13 without HW. -I 12 and -I 13 make little difference tho.

I hate to say it but it seems the 7850 has the edge over 750ti productivty wise while at same price… :( Tho I am not sure if lizhi had aggressive overclock or its just too hot in China :D - 86C

What temps are you getting with the 750ti ? Have you tried I-13 ?

lizhi

I gave it a try last night on my nVidia 550M, Win7 and I got max 8 khs. Mostly default settings, --worksize 256 -I 13, no overclock. Driver version 294.10 - a bit old

76C gpu temp -> not bad

I think it can reach up to 10 khs with some tweakin

This is what i get with -I 14

Limitation of the gpu?

And whats the logic 7850 to perform 3 times faster than 7970?

Do you guys expect the stratum implementation to raise the productivity significantly?

cgminer say “Maximun buffer memory device 0 supports says 536870912”

Please reduce the thread-concurrency

kris_davison

750ti are less power hungry tho?

Flobdeth

does -g 3 -I 17 work, or throwing back HW errors, anyone tried those settings?

lizhi

does -g 3 -I 17 work, or throwing back HW errors, anyone tried those settings?

-g 1 -I 13

daimyo

-g 2, 3 crashes the miner here

lizhi, you are correct. High tread concurrency was the cause

Wellenreiter

Wellenreiter, do we need external help with the stratum? Do you think it would increase productivity?

I can get my 550M to work up to I-13 without HW. -I 12 and -I 13 make little difference tho.

I hate to say it but it seems the 7850 has the edge over 750ti productivty wise while at same price… :( Tho I am not sure if lizhi had aggressive overclock or its just too hot in China :D - 86C

What temps are you getting with the 750ti ? Have you tried I-13 ?

Help with stratum would be really appreciated. My actual code is on github: https://github.com/wellenreiter01/p2pool-neoscrypt

I can add anybody to the repository who want to help.

I tested with minerd from Ghostlander and the hash calculated by the pool is always 2 byte too long when using stratum. Longpoll works fine.

Didn’t check my GPU temp, as the fans are running low speed it can’t be too high.

The NVIDIA cards are slower than the AMD card with opencl based miners.

I hope for Cudaminer to be adapted.

That should boost the performance of the cards.

AmDD

You all keep mentioning Nvidia cards. Is neo better run on those or is AMD still dominant? I ask because I have 3 rigs full of 7950’s that Im holding off on selling to mine feather once the algo is changed. :)

I want to setup one on the test pool this weekend if I have time.

kris_davison

The openCl gpu miner seems to run better on nvidia cards but if/when there is a cudaminer (nvidia specific) they should be pretty even. Nvidia cards generally use less power and are not as hot but you don’t get as high a hashrate so its swings and roundabouts really.