Topic: Cannot run 7950 and 280x together??? :( (Read 2501 times)
I found this thread because I am having the same issues, if anyone can help please pm me. The devices command is having no affect on and its getting frustrating.
You can just have a separate config for each card type and specify the devices you want to use with it. Check the --device option in cgminer. I run 7950 and 280x in the same rig with no problems.
Or make two workers at your pool and create two batch files like the following (assuming your cards are named 0 and 1):
Code:
cgminer --scrypt -o stratum+tcp://yourpool.com:port -u you.worker1 -p x -d 0 --remove-disabled
Code:
cgminer --scrypt -o stratum+tcp://yourpool.com:port -u you.worker2 -p x -d 1 --remove-disabled
Of course you can tweak and add your settings but this should get them running. You'll have 2 instances of cgminer with settings customized for each card.
Any other suggestions?
Just bought the mobo and 2x 2gb G.skill ripjaws ram 
Is XFX 850w PSU any good?
I'm still thinking whether to sell the 7950 and buy another MSI 280x or not
How many K/Hashes will the 7950 get if the gpu thread is on 2?
Can't i just run 2 instances of cgminer and set one -g 1 and the other -g 2?
Is XFX 850w PSU any good?
I'm still thinking whether to sell the 7950 and buy another MSI 280x or not
How many K/Hashes will the 7950 get if the gpu thread is on 2?
Can't i just run 2 instances of cgminer and set one -g 1 and the other -g 2?
They work together without a problem. I had sapphire 7950 and powercolor r9 280x. I choose -g 1 and hash values were 600 khash/s for 7950 and 660 khash/s for 280x. 600 is pretty normal for 7950 but 660 is not very good for r9 280x (normally 280x can get 700 khash out of box and with oc can easily get around 750 khash) You won't get best performance from both cards but still it's not that bad.
Remember that crossfire runs with cards of the same lineup ie 7850, 7870 etc
Since the 280x are technically rebranded older cards, you might be able to get away with it but best bet is to call up AMD or email then and ask them.
Since the 280x are technically rebranded older cards, you might be able to get away with it but best bet is to call up AMD or email then and ask them.
You can just have a separate config for each card type and specify the devices you want to use with it. Check the --device option in cgminer. I run 7950 and 280x in the same rig with no problems.
Is this true?
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!
Like the previous poster said you do need 2 separate batch files for the best results because of the threads flag (g-).
good luck!
If i were to sell my 7950 and buy another 280x, should I buy the Sapphire Toxic 280x, MSI 280x or the Generic AMD 280x
You can just have a separate config for each card type and specify the devices you want to use with it. Check the --device option in cgminer. I run 7950 and 280x in the same rig with no problems.
Seriously???
You can just have a separate config for each card type and specify the devices you want to use with it. Check the --device option in cgminer. I run 7950 and 280x in the same rig with no problems.
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!
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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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 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)
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
Didn't solve the problem so I am going make two rigs - first with 2x7850 and second with 2x7950 
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.
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.
-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
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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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.
7950 are more value for money. But they don' t hash faster.
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.
-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?
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.
-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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