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Title: How much RAM required per 7970? Post by: MrBilling on April 28, 2013, 04:55:54 PM So how much RAM is required to run each 7970? I have heard half the RAM to 7970, so 1.5GB per 7970. But I have also heard the RAM must match the amount of memory per 7970, so 3Gb per 7970.
Anyone? Title: Re: How much RAM required per 7970? Post by: whitetoo on April 29, 2013, 09:28:26 AM I'm running 3x 7970 on 8GB no problem.
Title: Re: How much RAM required per 7970? Post by: kendog77 on April 29, 2013, 03:14:04 PM Setup:
Linux Ubuntu 12.04 cgminer 3.0.0 mining litecoin 4x 7950s at over 600k per card (2.433 Mh/s system average) Memory usage appears to be under 2 gigs. ~$ free -m total used free shared buffers cached Mem: 3903 1660 2242 0 118 617 -/+ buffers/cache: 924 2979 Swap: 4042 0 4042 Title: Re: How much RAM required per 7970? Post by: BTCClicks on April 30, 2013, 12:57:00 AM You don't need much memory for mining bitcoins.
Title: Re: How much RAM required per 7970? Post by: Wilderness on April 30, 2013, 09:23:04 AM I have 4 x 7970 3 gb mining LTC with 8 GB ram if you're wondering about LTC mining
runs BTC with just 2gb Title: Re: How much RAM required per 7970? Post by: kevinmyers80 on April 30, 2013, 02:58:29 PM I believe that 2 gb is more than enough, I have 1 gb and a 7970 ... and never any trouble ...
Title: Re: How much RAM required per 7970? Post by: bcpokey on April 30, 2013, 11:47:00 PM I'm honestly a little confuzzled by all this ram and scrypt stuff.
I have 4GB on a machine, and running 3x7970s with CGMiner, they absolutely refuse to run with a thread concurrency above 18k. I looked back over the posts and ck says that he thinks it's a ram issue, and no other solutions have been offered. The cards run at lower concurrency, but at much lower hashes than I would like (something like 575KH/sec for a 7970 is poor) because of the subpar settings they are running under. They didn't have this issue when there was only 1 7970. So be aware that more cards may yield more problems. Title: Re: How much RAM required per 7970? Post by: kendog77 on April 30, 2013, 11:57:53 PM 7970s are very finicky beasts. I have a windows 8 machine with 2 7970s and 8 gigs of ram, and can't even get cgminer to start most of the time after tweaking settings.
I have one config that does work and yields ~630k per card mining litecoin, so I'm sticking with that for now, but it's frustrating because I know I should be able to get more out of these cards. I don't think it has anything to do with the amount of RAM in the system because 8 gigs should be plenty. Title: Re: How much RAM required per 7970? Post by: Wilderness on May 02, 2013, 01:18:52 PM kendog these are the settings I use for a 4 x 7970 rig 8gb ram and get 750mhash for mining LTC
Quote :loop cgminer.exe --scrypt -o stratum+tcp://eu.wemineltc.com:3333 -u username.1 -p password --shaders 2048 --lookup-gap 2 --thread-concurrency 8192 -I 13 -g 2 -w 256 --gpu-engine 1100 --gpu-memclock 1500 --auto-fan timeout /T 10 goto loop Title: Re: How much RAM required per 7970? Post by: GuiltySpark343 on May 05, 2013, 02:34:41 AM I have 3x 7970 running CGMiner 3.1.0 off of Win7 x64, Catalyst 13.1
I get about 500 kh/s (per card) using: --scrypt --shaders 2048 --lookup-gap 2 --thread-concurrency 8192 -I 13 --gpu-engine 1000 --gpu-memclock 1675 When I try the settings above by Wilderness, I drop to about 380 kh/s (per card). Not sure why my cards don't do well with those settings. Very odd. Title: Re: How much RAM required per 7970? Post by: notaek on May 05, 2013, 03:03:16 AM Across two 7970's, I am using 2.8 gigs.
1,398,780k on one 1,405,892k on the other Title: Re: How much RAM required per 7970? Post by: Kennji on May 05, 2013, 04:29:43 AM My 7970 is on a rig with 1gb ram. Running fine.
Title: Re: How much RAM required per 7970? Post by: MashRinx on May 05, 2013, 06:55:19 PM My 7970 is on a rig with 1gb ram. Running fine. 3 x 7970 in rigs with 2 GB RAM running fine, BTC or LTC mining |