2x 7970 Few questions

[previse]

Hey i'm waiting for my second 7970 to be delivered today. I'm going to be mining litecoins and could use some advice.

1) I have a tweaked config that does 700 KH/s (Sort of unstable) and i'm curious if anyone else has anything better than that.
2) Crossfire is a no-no when mining correct? As far as i remember when i crossfired my 6970s 2 years ago they were sort of .. lets say a disappointment

Thanks

[nave]

700 KH/s is pretty good for a 7970, depending on how much you have it overclocked. I haven't been able to get mine past 650 personally, despite spending a lot of time tweaking settings.

As far as crossfire goes, everyone says to stay away from it, yes. I personally have had it on with CGminer doing SHA256 and scrypt and haven't noticed much difference either way. I leave it off though because there's not really anything I need to crossfire 7970s for that one 7970 can't do by its' self.

[previse]

700 KH/s is pretty good for a 7970, depending on how much you have it overclocked. I haven't been able to get mine past 650 personally, despite spending a lot of time tweaking settings.

As far as crossfire goes, everyone says to stay away from it, yes. I personally have had it on with CGminer doing SHA256 and scrypt and haven't noticed much difference either way. I leave it off though because there's not really anything I need to crossfire 7970s for that one 7970 can't do by its' self.

Lol yeah thats what i figured as well. My rig is gonna be mining; nothing special and when i play games (BF3, C3, WoW, CSGO) I'm pretty sure 1 7970 can handle all of those maxed @ 1080p lol.

700 KH/s is good for a 7970? Awesome lol, didn't think it was that good.

What about MH/s (BTC)? What do you get? I get roughly 750 @ 1200/1600 Core/Clock

[BBQKorv]

You should find a sweet spot between core and ram, it gets you around 730khs with stock volts on Gigabyte WF3 OC 7970 cards.

[previse]

You should find a sweet spot between core and ram, it gets you around 730khs with stock volts on Gigabyte WF3 OC 7970 cards.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814125439
X2 --^

Is what i have. What would you suggest? Someone tweaked mine via TV and got me to 700 KH/S

[Eich]

700 KH/s is pretty good for a 7970, depending on how much you have it overclocked. I haven't been able to get mine past 650 personally, despite spending a lot of time tweaking settings.

As far as crossfire goes, everyone says to stay away from it, yes. I personally have had it on with CGminer doing SHA256 and scrypt and haven't noticed much difference either way. I leave it off though because there's not really anything I need to crossfire 7970s for that one 7970 can't do by its' self.

Lol yeah thats what i figured as well. My rig is gonna be mining; nothing special and when i play games (BF3, C3, WoW, CSGO) I'm pretty sure 1 7970 can handle all of those maxed @ 1080p lol.

700 KH/s is good for a 7970? Awesome lol, didn't think it was that good.

What about MH/s (BTC)? What do you get? I get roughly 750 @ 1200/1600 Core/Clock

It should be around the same number except in MH/s.

[previse]

700 KH/s is pretty good for a 7970, depending on how much you have it overclocked. I haven't been able to get mine past 650 personally, despite spending a lot of time tweaking settings.

As far as crossfire goes, everyone says to stay away from it, yes. I personally have had it on with CGminer doing SHA256 and scrypt and haven't noticed much difference either way. I leave it off though because there's not really anything I need to crossfire 7970s for that one 7970 can't do by its' self.

Lol yeah thats what i figured as well. My rig is gonna be mining; nothing special and when i play games (BF3, C3, WoW, CSGO) I'm pretty sure 1 7970 can handle all of those maxed @ 1080p lol.

700 KH/s is good for a 7970? Awesome lol, didn't think it was that good.

What about MH/s (BTC)? What do you get? I get roughly 750 @ 1200/1600 Core/Clock

It should be around the same number except in MH/s.

https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison#wiki-ATI_AMD_GPUs

non of those settings that people suggest get those numbers lol.

[crazyates]

You should find a sweet spot between core and ram, it gets you around 730khs with stock volts on Gigabyte WF3 OC 7970 cards.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814125439
X2 --^

Is what i have. What would you suggest? Someone tweaked mine via TV and got me to 700 KH/S

That's the one I have, and I tried LTC once, and couldn't get above 580KH/s. Stupid piece of shit...

Lol j/k I really love the cards. I get 722MH/s at 1200/1050 when mining BTC. Fan @ 90%, and temps <70C.

[previse]

You should find a sweet spot between core and ram, it gets you around 730khs with stock volts on Gigabyte WF3 OC 7970 cards.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814125439
X2 --^

Is what i have. What would you suggest? Someone tweaked mine via TV and got me to 700 KH/S

That's the one I have, and I tried LTC once, and couldn't get above 580KH/s. Stupid piece of shit...

Lol j/k I really love the cards. I get 722MH/s at 1200/1050 when mining BTC. Fan @ 90%, and temps <70C.

Ah you have the same cards?

[BBQKorv]

This is what I have: http://www.newegg.com/Product/Product.aspx?Item=N82E16814125413

Nearly the same as that GHz edition but stock at 1000/1375. Haven't tried any other models but these seem to work well for me. Seems like one card in one of my rigs can't achieve 730Khs with unpowered 1x extender, while others do steady 730Khs. I'll try powered riser on that some day, already swapped the card to see if it's faulty but no difference.

1050/1450, +20%

[crazyates]

You should find a sweet spot between core and ram, it gets you around 730khs with stock volts on Gigabyte WF3 OC 7970 cards.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814125439
X2 --^

Is what i have. What would you suggest? Someone tweaked mine via TV and got me to 700 KH/S

That's the one I have, and I tried LTC once, and couldn't get above 580KH/s. Stupid piece of shit...

Lol j/k I really love the cards. I get 722MH/s at 1200/1050 when mining BTC. Fan @ 90%, and temps <70C.

Ah you have the same cards?

The exact same. Gigabyte 7970 GHz Edition, stock overclock of 1100/1500, WF3 tri-fan cooler, GV-R797TO-3GD. Bought it 2012-08-13 from Newegg. Mine is somehow voltage unlocked, while other people are saying theirs are locked. It rocks at BTC mining, but can barely get anything out of it for LTC.

[previse]

You should find a sweet spot between core and ram, it gets you around 730khs with stock volts on Gigabyte WF3 OC 7970 cards.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814125439
X2 --^

Is what i have. What would you suggest? Someone tweaked mine via TV and got me to 700 KH/S

That's the one I have, and I tried LTC once, and couldn't get above 580KH/s. Stupid piece of shit...

Lol j/k I really love the cards. I get 722MH/s at 1200/1050 when mining BTC. Fan @ 90%, and temps <70C.

Ah you have the same cards?

The exact same. Gigabyte 7970 GHz Edition, stock overclock of 1100/1500, WF3 tri-fan cooler, GV-R797TO-3GD. Bought it 2012-08-13 from Newegg. Mine is somehow voltage unlocked, while other people are saying theirs are locked. It rocks at BTC mining, but can barely get anything out of it for LTC.

As mine are both apparently unlocked as well? I'm able to tweak voltage without an issue.

odd ...

[JimmyFL]

2*7970 from Gigabyte (no GHz edition):

[silicont]

I can get ~735-750mhs LTC with that gigabyte with the switches below (stock locked voltage).  LTC mining uses ~50w more per gpu than BTC mining.  The real edge is the memory to engine clock ratio.  Check cgminer's scrypt readme for good help finding the sweat spot.

--shaders 2048 --lookup-gap 2 --thread-concurrency 8192 -I 13 -g 2 -w 256 --gpu-engine 1100 --gpu-memclock 1500 --auto-fan

[crazyivan]

Did I get this correctly, when setting up 4 7970, not to use crossfire, just to plug them in, right?

Why is this?

[Wilderness]

I can get ~735-750mhs LTC with that gigabyte with the switches below (stock locked voltage).  LTC mining uses ~50w more per gpu than BTC mining.  The real edge is the memory to engine clock ratio.  Check cgminer's scrypt readme for good help finding the sweat spot.

--shaders 2048 --lookup-gap 2 --thread-concurrency 8192 -I 13 -g 2 -w 256 --gpu-engine 1100 --gpu-memclock 1500 --auto-fan

i have 4 x gigabyte 7970's OC edition and was geting 700 stock. Just tried your settings and 3 of the cards got an additional 50 khash woot - hope it's stable cheers

[ewitte]

1050/1450, +20%

U: should be higher I'm having similar issues.  Can get high KH/s but the numbers on the site are crap.  The single card 7850 system is better than the dual 7870!

[Eich]

You guys that are getting the KH/s rates need to make sure you have the SDK installed!

[Wilderness]

You guys that are getting the KH/s rates need to make sure you have the SDK installed!

unless you're mining LTC, then 750 khash is what a 7970 will get

[drlukacs]

How are you able to keep the temperatures so low?