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Author Topic: So many Litcoin and Hardware Questions!! Please Help :)  (Read 1095 times)
redmist
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March 25, 2013, 07:08:51 AM
 #1

Hi guys,
So yesterday I finished building my first mining rig, and its been mining Litecoin since.
I've managed to get everything working, but I still have loads of questions, and if any of you guys could answer that would be greatly appreciated. So here goes:

1) I've only got one GPU at the moment, and its a Sapphire Toxic 5850 2GB. I'm getting about 377khash with these parameters:
cgminer --scrypt -o http://litecoinpool.org:9332 -u xxxxx -p xxxxx --shaders 1440 --intensity 19 --worksize 256 -g 1 --thread-concurrency 8000 --gpu-engine 900 --gpu-memclock 1000
The temperature of the card is only at 65 degrees Celsius, so basically I'm wondering if any of you guys can recommend better parameters that will give me a higher hash rate.

2) In the next week or so, I'm going to add another 2 5850's. However, with the card I have at the moment, there is already an extremely limited amount of space in my case. I can't see the other 2 cards fitting in there at all. What do you guys suggest I should do? Sack the case and just mount it on a rack?

3) The graphics card that I have in my rig at the moment requires power (i think most of them do now anyway), which is fine as I have a 750 Watt PSU. However, the card requires 2x75 watt 6-pin PCI Express power connectors to run. Luckily my case came with 2 of them, so the card works fine. However when I get my next two cards, how do I supply power to them, as the PSU doesn't have any more power connectors coming off it that I could use. Do I have to buy some more? If so, how do I get them to connect to everything?

4) I've heard a lot about crossfire, and I'm not really sure what I'm doing when it comes to that. I'm guessing it has something to do with running more than one gpu at once. Could someone give me a brief description of what I need to do to get 3 gpu's running at once, and all of them at around the same hash rate?

5) Whilst mining with cgminer with my single card, the hash rate it shows seems to jump between 100-500 khash every 5 seconds. Surely that's not right is it? The average khash it shows is 377, which seems about right compared to the wiki. Just wondering if anyone can tell me if it should be jumping so much and if not, how to fix it.

6) Not that this matters much, but cgminer shows this:
Best share: 70.9K
I'm not really sure what this is, but I'd like to know just out of curiosity.

Well I think that's all of them. No doubt I'll have more questions as some of them are answered, but hey ho.
I'm not particularly experienced and the learning curve is pretty damn steep, so if anyone could help out that would be awesome.
Thanks guys

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wizzardTim
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March 25, 2013, 07:48:31 PM
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Hi,

Welcome to the world of litecoin mining. I can't answer all your questions, but i know you'll find these helpful:https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison
https://bitcointalk.org/index.php?topic=117221.0

Cheers,

Behold the Tangle Mysteries! Dare to know It's truth.

- Excerpt from the IOTA Sacred Texts Vol. I
redmist
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March 25, 2013, 08:53:39 PM
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Hi,

Welcome to the world of litecoin mining. I can't answer all your questions, but i know you'll find these helpful:https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison
https://bitcointalk.org/index.php?topic=117221.0

Cheers,

Thanks for the links Smiley

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NobleCoin: 9YYgeoJRa4MXSXZ66aaZvTSFuREVjBfSx4
Wolf0
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March 26, 2013, 02:16:09 AM
 #4

Try using "-g 2" or higher.

Code:
Donations: BTC: 1WoLFdwcfNEg64fTYsX1P25KUzzSjtEZC -- XMR: 45SLUTzk7UXYHmzJ7bFN6FPfzTusdUVAZjPRgmEDw7G3SeimWM2kCdnDQXwDBYGUWaBtZNgjYtEYA22aMQT4t8KfU3vHLHG
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March 26, 2013, 02:49:57 AM
 #5

most likely you will get more kh/s by using --gpu-memclock 1200

Code:
XMR: 44GBHzv6ZyQdJkjqZje6KLZ3xSyN1hBSFAnLP6EAqJtCRVzMzZmeXTC2AHKDS9aEDTRKmo6a6o9r9j86pYfhCWDkKjbtcns
redmist
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March 26, 2013, 08:17:07 AM
 #6

Tried what both of you recommended. Increased a little bit, but the gpu got pretty hot really quickly. I think 377 is pretty good though so I'm cool with that.

I've managed to answer most of the questions above from various other posts, but would anyone know why the hash rate cgminer is showing me, jumps around from 100 to 500 and anywhere in between? Shows the average at 377, but I'm just trying to figure out how I can make the actual hash rate more stable.

NobleCoinLibertyProsperitySecurity
NobleCoin: 9YYgeoJRa4MXSXZ66aaZvTSFuREVjBfSx4
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