I'm thinking of getting a second graphics card, on top of my Sapphire Radeon 6970. The new card would most likely be a Radeon HD 7970. Does anyone have any experience with this, is it possible to run 2 different models of GPUs in crossfire, considering the memory/manufacturer differences?
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Radon HD 7970 + Radeon HD 6970 Crossfire
- Thread starter eewo
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Soldato
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they have to be from the same series
this is how it works
6950 + 6950/6970 = Works
7950 + 6950 = Doesnt woirk
but if you mix together a 1GB Vram card and a 2Gb Vram then you will only get the 1GB and not 3GB.
same goes for performance if you have a 6950+6970 it will only be like 2x 6950.
this is how it works
6950 + 6950/6970 = Works
7950 + 6950 = Doesnt woirk
but if you mix together a 1GB Vram card and a 2Gb Vram then you will only get the 1GB and not 3GB.
same goes for performance if you have a 6950+6970 it will only be like 2x 6950.
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I don't think that bit is correct.
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It's not (according to MSI Afterburner anyway)
Soldato
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does it not go by the slower card? example; making the 6970 equal performance to the 6950? obviously not being able to add power.
no you can run two cards at different clock speeds, someone made that myth up about running as fast as the slowest card and it spread like wildfire.
only problem is if you run two cards at different speeds, one will be working faster than the other and maybe waiting for the other which could equate to the dreaded microstutter....note this is my own theory and could be a load of crap
only problem is if you run two cards at different speeds, one will be working faster than the other and maybe waiting for the other which could equate to the dreaded microstutter....note this is my own theory and could be a load of crap
No.
SLI does, or used to do, that. Not sure of the current situation.
Crossfire will run with cards of different speeds or slightly different GPU's of the same family such as a 6950 and a 6970.
I provided proof for the disbelievers here of cards being able to run at different speeds in CrossFire.
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Grab yourself a second 6970 and enjoy the performance boost. Just make sure you keep up to date with the crossfire profiles and drivers and you shouldnt have too much problem.
Also make sure your power supply is up to the job along with your cooling.
Also make sure your power supply is up to the job along with your cooling.
no
example
a 6950 as 1408 Shaders, a 6970 has 1536 , CF doesn't shut off any shaders , they all get used
also the clock speeds can be ran at different speeds
With Crossfire all the cards can run at their native clocks.
I think it's SLi that syncs the clocks to the lowest card. SLi has more limitations, but I think they did this so there will be less problems with SLi on the driver side.
I think it's SLi that syncs the clocks to the lowest card. SLi has more limitations, but I think they did this so there will be less problems with SLi on the driver side.