ibrahim11 (OP)
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December 28, 2013, 10:19:05 PM |
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Hi, im about to make my very first litecoin/other alt coin mining rig. Some people said that 7950 and 280x may not run together properly. Is this true?
I already bought a:
Sapphire 3GB 7950 BOOST MSI R9 280x
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thah00pz
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December 28, 2013, 10:20:53 PM |
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the 280x equivalent is the 7970, which can be run in crossfire since they're pretty much the same card woopsie
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Serellyn
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December 28, 2013, 10:23:26 PM |
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As thah00pz stated, the 280x is a rebranded 7970 not a 7950... The 270x is neither a 7950, the 270x is a rebranded 7870. In the future make sure you combine cards in the same range.
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atp1916
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December 28, 2013, 10:26:56 PM |
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For one thing, the 7950 likes -g 1 settings while the 280x(7970) likes -g 2 settings.
-g is your gpu-threads setting, and it's a serious serious pita getting cards liking different -g settings to work well with each other.
I've tried splitting config files between the -g 1 and -g 2 cards, batch files the same but the result is always the same, even after messing with the --gpu-map flag.
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ibrahim11 (OP)
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December 28, 2013, 10:36:01 PM |
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For one thing, the 7950 likes -g 1 settings while the 280x(7970) likes -g 2 settings.
-g is your gpu-threads setting, and it's a serious serious pita getting cards liking different -g settings to work well with each other.
I've tried splitting config files between the -g 1 and -g 2 cards, batch files the same but the result is always the same, even after messing with the --gpu-map flag.
So im screwed basically
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thah00pz
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December 28, 2013, 10:42:03 PM |
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So im screwed basically sell the 7950 while the prices are still through the roof and preorder another 280x for ~$300 USD
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milkmanHH
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December 28, 2013, 10:43:30 PM |
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Why don't you test if they work or not? And share the results with us.
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djeZo
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December 28, 2013, 10:44:43 PM |
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You are talking shit, I used to run very diverse specter of cards, from 5870 up to 280X on single machine. You just need to configure cgminer properly, that is all...
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ibrahim11 (OP)
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December 28, 2013, 10:53:27 PM |
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Why don't you test if they work or not? And share the results with us.
Yeah, but then i can't sell the 7950 as new Basically, I bought the MSI 280x's for £230 on sale. If i sell my 7950 for £265 then I can buy another MSI 280x for £270 but its not on sale anymore
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atp1916
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December 28, 2013, 10:57:39 PM |
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For one thing, the 7950 likes -g 1 settings while the 280x(7970) likes -g 2 settings.
-g is your gpu-threads setting, and it's a serious serious pita getting cards liking different -g settings to work well with each other.
I've tried splitting config files between the -g 1 and -g 2 cards, batch files the same but the result is always the same, even after messing with the --gpu-map flag.
So im screwed basically No, not screwed....it can be done but it's a real pain in the neck. You should be able to flip that 7950 on ebay for $325-350 no problem, especially if it's one of the Sapphire reference blower model 3Ls/4Ls.
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ibrahim11 (OP)
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December 28, 2013, 11:06:10 PM |
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For one thing, the 7950 likes -g 1 settings while the 280x(7970) likes -g 2 settings.
-g is your gpu-threads setting, and it's a serious serious pita getting cards liking different -g settings to work well with each other.
I've tried splitting config files between the -g 1 and -g 2 cards, batch files the same but the result is always the same, even after messing with the --gpu-map flag.
So im screwed basically No, not screwed....it can be done but it's a real pain in the neck. You should be able to flip that 7950 on ebay for $325-350 no problem, especially if it's one of the Sapphire reference blower model 3Ls/4Ls. Aren't 7950's better than 280x's?
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Bfljosh
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December 28, 2013, 11:10:18 PM |
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7950 are more value for money. But they don' t hash faster.
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atp1916
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December 28, 2013, 11:11:08 PM |
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Aren't 7950's better than 280x's? Performance / watt is *usually* better on the 7950. 7950s really do well when undervolted to 1.0v or less and maintaining the 600khs+ hash mark. The 280x can achieve similiar performance / watt by undervolting, but most models are locked. Can't go wrong with either, tbh.
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BrewCrewFan
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December 28, 2013, 11:12:52 PM |
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So im screwed basically sell the 7950 while the prices are still through the roof and preorder another 280x for ~$300 USD where the hell you ordering the 280 for around 300...
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undeadbitcoiner
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December 28, 2013, 11:14:44 PM |
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For one thing, the 7950 likes -g 1 settings while the 280x(7970) likes -g 2 settings.
-g is your gpu-threads setting, and it's a serious serious pita getting cards liking different -g settings to work well with each other.
I've tried splitting config files between the -g 1 and -g 2 cards, batch files the same but the result is always the same, even after messing with the --gpu-map flag.
So im screwed basically It will be more good if you could exchange one of your gpu and get the same product with other
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BrewCrewFan
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December 28, 2013, 11:16:46 PM |
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You are talking shit, I used to run very diverse specter of cards, from 5870 up to 280X on single machine. You just need to configure cgminer properly, that is all...
This^ It can be done but it takes some playing around. Many people just expect to plug and play... or plug, copy .conf, and play.
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ondratra
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December 28, 2013, 11:16:58 PM |
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Unfortunately i've run into similiar problems lately - i got 7850(~315kHash/s) and 7950(~650kHash/s) in one rig, but, when I run them together i only get ~650kHash/s Didn't solve the problem so I am going make two rigs - first with 2x7850 and second with 2x7950
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thah00pz
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December 28, 2013, 11:17:26 PM |
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So im screwed basically sell the 7950 while the prices are still through the roof and preorder another 280x for ~$300 USD where the hell you ordering the 280 for around 300... you can preorder the 280x cards for their original $300 price point, if you know where to look (hint: definitely not newegg/amazon)
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ibrahim11 (OP)
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December 28, 2013, 11:24:46 PM |
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Aren't 7950's better than 280x's? Performance / watt is *usually* better on the 7950. 7950s really do well when undervolted to 1.0v or less and maintaining the 600khs+ hash mark. The 280x can achieve similiar performance / watt by undervolting, but most models are locked. Can't go wrong with either, tbh. I don't really care about the watt usage unless if it goes over 700w (750w will be the psu i am buying). Should I just sell the 7950. I got it for a good price at £170 Btw everyone - i live in the uk
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ExtraExtra
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December 28, 2013, 11:29:13 PM |
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I've got those 2 in a rig right now (both are MSI though) and it's working just fine.
Like the previous poster said you do need 2 separate batch files for the best results because of the threads flag (g-).
good luck!
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