Cannot run 7950 and 280x together??? :(

[ibrahim11]

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

[thah00pz]

the 280x equivalent is the 7970, which can be run in crossfire since they're pretty much the same card
woopsie

[Serellyn]

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.

[atp1916]

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.

[ibrahim11]

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

[thah00pz]

So im screwed basically

sell the 7950 while the prices are still through the roof and preorder another 280x for ~$300 USD

[milkmanHH]

Why don't you test if they work or not? And share the results with us.

[djeZo]

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...

[ibrahim11]

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

[atp1916]

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.

[ibrahim11]

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?

[Bfljosh]

7950 are more value for money. But they don' t hash faster.

[atp1916]

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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.  

[BrewCrewFan]

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...

[undeadbitcoiner]

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

[BrewCrewFan]

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.

[ondratra]

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

[thah00pz]

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)

[ibrahim11]

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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

[ExtraExtra]

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!