litecoin rig check (4x 7950) | Bitcointalksearch.org

joshki

full member

Activity: 210

Merit: 100

Quote from: lewlzminer on April 30, 2013, 03:24:49 PM

ok i removed 8gb of my 10gb rig running 5x7950

start cgminer:

[2013-04-30 21:23:01] Thread 1 being disabled
[2013-04-30 21:23:01] Error -5: Enqueueing kernel onto command queue. (clEnque
eNDRangeKernel)
[2013-04-30 21:23:01] GPU 4 failure, disabling!
[2013-04-30 21:23:01] Thread 4 being disabled
[2013-04-30 21:23:02] API running in IP access mode on port 4028 (22592)
[2013-04-30 21:23:03] Pool 0 stratum+tcp://stratum.give-me-ltc.com:3333 alive
[2013-04-30 21:23:03] Switching to pool 0 stratum+tcp://stratum.give-me-ltc.co
:3333

solution?

Put the ram back. Wink

lewlzminer

newbie

Activity: 22

Merit: 0

ok i removed 8gb of my 10gb rig running 5x7950

start cgminer:

[2013-04-30 21:23:01] Thread 1 being disabled
[2013-04-30 21:23:01] Error -5: Enqueueing kernel onto command queue. (clEnque
eNDRangeKernel)
[2013-04-30 21:23:01] GPU 4 failure, disabling!
[2013-04-30 21:23:01] Thread 4 being disabled
[2013-04-30 21:23:02] API running in IP access mode on port 4028 (22592)
[2013-04-30 21:23:03] Pool 0 stratum+tcp://stratum.give-me-ltc.com:3333 alive
[2013-04-30 21:23:03] Switching to pool 0 stratum+tcp://stratum.give-me-ltc.co
:3333

solution?

auctioneeeeer

sr. member

Activity: 305

Merit: 250

I downgraded the BIOS on all of my Gigabyte 7950's to F43, and they run 5-10c cooler, and draw about 50w less...

chungenhung

legendary

Activity: 1134

Merit: 1005

Quote from: kendog77 on April 29, 2013, 11:29:03 AM

I like the Gigabyte 7950s, and actually have 7 of them, but they do run hot inside a case if you don't have very good airflow.

Whichever card is plugged into PCI-E slot 1 also seems to run very hot, so they do much better in an open case using risers.

They come factory overclocked at 1000/1250, and do over 600k mining litecoin without additional over clocking.

I really like these cards, but keep an eye on temps if you use them in a closed case and plug the cards directly into the mobo.

They suck a lot of power though. At least 50w more than other 7950 cards. I guess the extra KH has to come from somewhere.

chungenhung

legendary

Activity: 1134

Merit: 1005

Quote from: lewlzminer on April 30, 2013, 02:23:52 PM

so can you tell me what thread concurrency you are using? i use 217xx and need ~1500gb ram per card
3 cards was the limit for 4gb running on win7 64 with cgminer

the ram does not show as "used" in task manager but unless you have enough ram cgminer throws errors...

Then you are doing something very very wrong. No way it uses that much ram.

chungenhung

legendary

Activity: 1134

Merit: 1005

Quote from: kendog77 on April 29, 2013, 11:01:06 AM

If you want to waste your money on RAM for a litecoin mining rig that isn't need, go ahead.

I'm done. Grin

Exactly. Let those people waste their money.
I am in the similar boat with you, running 4x 7950 on a 2gb ram.

lewlzminer

newbie

Activity: 22

Merit: 0

so can you tell me what thread concurrency you are using? i use 217xx and need ~1500gb ram per card
3 cards was the limit for 4gb running on win7 64 with cgminer

the ram does not show as "used" in task manager but unless you have enough ram cgminer throws errors...

miningdude

sr. member

Activity: 416

Merit: 250

Have a mining rig

The RAM requirement/misunderstanding for Litecoin mining is directly related to the mining software being used. If you use Reaper, you need extra RAM, however cgminer will run 4 cards just fine on 4GB of RAM.

kendog77

hero member

Activity: 742

Merit: 500

I like the Gigabyte 7950s, and actually have 7 of them, but they do run hot inside a case if you don't have very good airflow.

Whichever card is plugged into PCI-E slot 1 also seems to run very hot, so they do much better in an open case using risers.

They come factory overclocked at 1000/1250, and do over 600k mining litecoin without additional over clocking.

I really like these cards, but keep an eye on temps if you use them in a closed case and plug the cards directly into the mobo.

pajak666

hero member

Activity: 746

Merit: 502

Looking for advertising deal

ram isn't an issue since it's quite cheap and I got plenty of ram which I can borrow from my current pc to see how much do I really need and post solution.
anyway I've decided to go with those cards:
GV-R795WF3-3GD
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125414

anyone got some experiences with them?
expected hashrate?
you think they are good choice?

kendog77

hero member

Activity: 742

Merit: 500

If you want to waste your money on RAM for a litecoin mining rig that isn't need, go ahead.

I'm done. Grin

joshki

full member

Activity: 210

Merit: 100

Quote from: kendog77 on April 29, 2013, 10:52:19 AM

My 4x 7950 rig is currently humming along at over 2400k, so it certainly doesn't seem to be limited by 4 gigs of ram.

When you're building one rig, I guess it doesn't matter that much. I have a couple, so I don't like wasting money on things that aren't necessary for mining.

4x 7950s = $1200
CPU / mobo = $150
USB Drive = $25
4 gigs ram = $25
1200W Power Supply = $150
Linux Ubuntu 12.04 = free
Crate case / risers = $50
Total = $1600 for 2400k

You can also sell the Never Settled bundles and bring down the cost even more.

This guide by tacotime is a good place to start:
https://bitcointalksearch.org/topic/litecoin-build-for-noobs-3x-7950s-18-mhs-in-a-10-crate-case-163306

That's a great guide, and he says to use 8GB of ram...

kendog77

hero member

Activity: 742

Merit: 500

My 4x 7950 rig is currently humming along at over 2400k, so it certainly doesn't seem to be limited by 4 gigs of ram.

When you're building one rig, I guess it doesn't matter that much. I have a couple, so I don't like wasting money on things that aren't necessary for mining.

4x 7950s = $1200
CPU / mobo = $150
USB Drive = $25
4 gigs ram = $25
1200W Power Supply = $150
Linux Ubuntu 12.04 = free
Crate case / risers = $50
Total = $1600 for 2400k

You can also sell the Never Settled bundles and bring down the cost even more.

This guide by tacotime is a good place to start:
https://bitcointalksearch.org/topic/litecoin-build-for-noobs-3x-7950s-18-mhs-in-a-10-crate-case-163306

mxmz.in

full member

Activity: 122

Merit: 100

Need for more RAM is a false statement if you run cgminer. No powerful CPU is needed as well.

grue

legendary

Activity: 2058

Merit: 1431

Quote from: joshki on April 29, 2013, 10:37:57 AM

Quote from: kendog77 on April 29, 2013, 10:30:06 AM

I know that he is using it for litecoin, and the need for more than 4GB of RAM for 4 cards is still false.

I have a litecoin mining rig running right now with 4GB of ram and 4 7950s using cgminer.

I'm a little new at this, but everything I can find on this forum says you need more ram to support higher thread concurrency to maximize the cards' potential. No reason it wouldn't run with less ram, but your thread concurrency would be limited.

When ram is probably the cheapest component, why scrimp to save a couple of dollars and limit yourself?

it's still a waste of money. besides, if he doesn't have enough ram, he can always buy more.

joshki

full member

Activity: 210

Merit: 100

Quote from: kendog77 on April 29, 2013, 10:30:06 AM

I know that he is using it for litecoin, and the need for more than 4GB of RAM for 4 cards is still false.

I have a litecoin mining rig running right now with 4GB of ram and 4 7950s using cgminer.

I'm a little new at this, but everything I can find on this forum says you need more ram to support higher thread concurrency to maximize the cards' potential. No reason it wouldn't run with less ram, but your thread concurrency would be limited.

When ram is probably the cheapest component, why scrimp to save a couple of dollars and limit yourself?

kendog77

hero member

Activity: 742

Merit: 500

I know that he is using it for litecoin, and the need for more than 4GB of RAM for 4 cards is still false.

I have a litecoin mining rig running right now with 4GB of ram and 4 7950s using cgminer.

joshki

full member

Activity: 210

Merit: 100

Quote from: kendog77 on April 29, 2013, 10:17:59 AM

"You're going to need more than 4GB ram for four cards. At least double it."

The statement above is false. 4GB of ram is plenty for four cards if you're using cgminer. I believe reaper requires more ram, which is why people keep saying this, but I'm not sure why anyone would use reaper over cgminer at this time.

He's planning to use it for litecoin, not bitcoin.

The rule of thumb for 7970s, as far as I can find, is 1.5GB per card.

btcminer021

member

Activity: 98

Merit: 10

Mine hard!

I get 645Mh/s with a Sapphire 7970 with stable OC

kendog77

hero member

Activity: 742

Merit: 500

"You're going to need more than 4GB ram for four cards. At least double it."

The statement above is false. 4GB of ram is plenty for four cards if you're using cgminer. I believe reaper requires more ram, which is why people keep saying this, but I'm not sure why anyone would use reaper over cgminer at this time.

Topic: litecoin rig check (4x 7950) (Read 11177 times)