3rd 7970 only getting 75kh/s? :(

[hybridkdm]

I have a new setup so far but on my 3rd card which just arrived today from newegg, i'm only getting 75kh/s.  In addition to that, it lowers my first two cards Hash rate to 300 kh/s.  

I have the following setup:

ASRock extreme 4 970 Mobo
8GB Corsair Ram
AMD Sempron single core processor
3 Sapphire 7970 Dual X video cards

Can anyone help me understand why my third card is slowing down my hash rates?

Im using the following in CGMiner

--scrypt --thread-concurrency 8192 -I 13 -w 256 -g 2 --gpu-engine 1019 --gpu-memclock 1496 --shaders 2048

I have all 3 cards on risers.  2 on powered 16x-16x risers and 1 on 1x-16x riser. 

[bitcointrader55]

don't waste your time on GPU mining, cut your loses and sell it.

Going forward, only use an ASIC if you are serious about it.

[Walt Sobchak]

I believe this could be a memory restriction. I've read elsewhere (and my bosses rig did the same thing) that you must have at least the equivalent system memory of the graphics card memory total. So if you have 9GB of memory between your three cards your 8GB of RAM might be messing with your configuration.

Not really positive, but definitely something to try.

On a side note, what brand/output is your power supply?

[sniffinpoprocks]

why scrypt? what are you trying to mine? just go with guiminer, get a pool account, point to a pool and mine bitcoin. no need for scrypt for bitcoin.

[notaek]

None of these people know what they are talking about.  Mine your scrypt coins.  You will be able to sell if for close to the same price a few months from now, so just mine now and you can sell later.

 For now though, see if you are maxxing out on ram.  You should be using around 4.5gb between those cards, so there may be an issue if you only have 4gb of system ram. Didn't read, if you have 8gb of RAM that definitely isn't the issue. Open GPU-z and see if the clock speeds go up when you start your miner.  When you aren't mining, the card should be clocked at 300MHz.  Sometimes when you start mining, it stays at 300MHz and that is a reason for slow speeds.  Report back and we'll see what we can do.

[sniffinpoprocks]

None of these people know what they are talking about.  Mine your scrypt coins.  You will be able to sell if for close to the same price a few months from now, so just mine now and you can sell later.

He's right, mine now, sell later, because nothing has a more stable, guaranteed, climbing value than alt coins.

[Kennji]

don't waste your time on GPU mining, cut your loses and sell it.

Going forward, only use an ASIC if you are serious about it.

For BTC.

You realize there are other coins, right?

[Kennji]

LOL I thought I was a newbie.  Until I saw this thread.

[hybridkdm]

I'm mining Litecoins not BTC, sorry for the confusion.

So for some reason my PC would OC 3 of my 4 cards, all I did was insert the card directly onto my MB and I was able to OC it.  Not sure what that issue was but at least that solved the issue. 

All 4 cards are running fine now and tomorrow I'll start the OC'ing to get the best numbers.

Thanks for the suggestions everyone. 

[hybridkdm]

why scrypt? what are you trying to mine? just go with guiminer, get a pool account, point to a pool and mine bitcoin. no need for scrypt for bitcoin.

Because for some reason, using GUIminer lowers my hash rate.  With CG I get 680 per card.  With GUI I get about 667. 

[Aragami]

why scrypt? what are you trying to mine? just go with guiminer, get a pool account, point to a pool and mine bitcoin. no need for scrypt for bitcoin.

Because for some reason, using GUIminer lowers my hash rate.  With CG I get 680 per card.  With GUI I get about 667. 

That's rather interesting, i'd almost be willing to bet its because you've put different settings/flags in your guiminer perhaps? If you select the default flags for your card in guiminer, it might be different from the flags you've set in cgminer, worth checking.