AMD 7990

[stan92]

I know the AMD 7990 is a dual 7970 GPU, but does it have the same problems as running say 2 x 7970 single cards in crossfire like microstuttering etc?

[ComputerNoob]

I would think so

[Cacao]

Yes, it's pretty much the same as running 2 discrete 7970s, though the issues have been somewhat addressed with driver updates.

[Excon]

Microstutter is greatly fixed with the 13.8 drivers if you use a single monitor. Yes , it is 2 7970Ghz GPU's on one card and the performance reflects that quite equally.

[Villain]

Any problems you would have in crossfire would persist with a 7990. However, microstuttering has been fixed for dx10/11 games on single monitor setups, and later this month or early next month there will likely be drivers to fix everything else that has microstuttering issues.

[CoolBeans]

Yes it does because it uses crossfire for the GPUs but the micro stuttering is almost not noiticible

[stan92]

ok thanks, what exactly is microstuttering? also say a single 7970 gets 100fps in Battlefield 3 for instance would the 7990 / two 7970's produce 200fps in the same instance???

[Hans Christian | Teri]

Yes, it is exactly the same.

[stan92]

also why does it seem that there are only gigabyte 7990's?

[xAcid9]

ok thanks, what exactly is microstuttering? also say a single 7970 gets 100fps in Battlefield 3 for instance would the 7990 / two 7970's produce 200fps in the same instance???

 

Read this article slowly. 

 

http://www.pcper.com/reviews/Graphics-Cards/Frame-Rating-Catalyst-138-Brings-Frame-Pacing-AMD-Radeon

[A/C]

What's your setup? -That's the first thing you need to let people know so they can help you.

 

Like this, I'd recommend you wait for the next driver update and see what it brings, only then will you be home-free. Until then, it's only a risk which I personally wouldn't take for such a short time, especially since no graphically demanding games are coming out in the next month.

 

And no, you will not get 200fps since 2xgraphics cards never scale 100% meaning you never get the double power, it varies... 

 

Like always my final answer is wait for the 9000 series. Save your money for the 9970. Crossfire/SLI confirgurations never work. (I don't mean literally never, but they never work )

[stan92]

thanks A/C usually what fps would someone expect from 100fps with 1 gpu to ***fps with 2?

[ProGearUk]

You would not have the problems with the cards and micro stuttering. This has been resolved in the Catalyst 13.8 update. 

[Hammerhead]

the Sapphire 7990 is around 670 USD on Amazon.com right now

[stan92]

the sapphire looks the exact same as gigabyte, only difference is sticker in middle of fans...

[I'm Batman]

yes it is basicly 7970 in CrossX all the problems that CrossX has 7990 has them too

[A/C]

thanks A/C usually what fps would someone expect from 100fps with 1 gpu to ***fps with 2?

 

 

Well it's relative to the game,, your setup, and the drivers. Here's a TLDR video from Linus himself: http://www.youtube.com/watch?v=XS5rBS8n-LM  Bear in mind that scaling is largely improved since this video was filmed, and AFAIK the 7970 has the best scaling since the 660-ti.

 

 

A quick google searrch reveals this thread: http://forums.anandtech.com/showthread.php?t=2234652

[stan92]

thanks A/C your very helpful

[Dravic]

Well it's relative to the game,, your setup, and the drivers. Here's a TLDR video from Linus himself: http://www.youtube.com/watch?v=XS5rBS8n-LM  Bear in mind that scaling is largely improved since this video was filmed, and AFAIK the 7970 has the best scaling since the 660-ti.

 

 

A quick google searrch reveals this thread: http://forums.anandtech.com/showthread.php?t=2234652

 

And that is an old thread with FPS from old drivers so chances are new drivers would give you worse FPS but no screen tearing etc.

 

So that is not really helpful, not at all.

[Dravic]

thanks A/C your very helpful

[A/C]

And that is an old thread with FPS from old drivers so chances are new drivers would give you worse FPS but no screen tearing etc.

 

So that is not really helpful, not at all.

 

 

Like I already said, it's relative to the drivers, his setup and the game... No need to flame as no one can give him a definitive and correct answer.

 

And even if the thread I found was up to date and correct, it's still about the two 7970's and not about a 7990, which is again just a bit different, but enough for benchmark crunchers to notice.

 

Instead of flaming around, maybe you could try and help the man. No hard feelings.

[Hammerhead]

i went Sapphire 7970 for 309 USD and saved about 400 USD always leaves the option to crossfire later and still saves me 100 bucks

[A/C]

-smart man

[Hammerhead]

the 7970 is a sweet single card. i was looking into the 7990 route also but am very pleased with my choice to go single GPU 7970 first. pluse this thing runs so cool(and quiet) its not even funny. overclocks very well. I am running at 1150/1525 on stock voltage and not even breaking 50C on full game load.   but like i said it still gives you the option of adding another for 7990 type performace at less or around the same cost of a 7990.

 

also if you are going to be overclocking no matter what card you chose try to make sure the card is not voltage locked if thats an option. just so you have that as an option while over clocking.

[stan92]

nice hammerhead, what case and cooling are you using? also whats the 7950 like compared to the 7970? in fps differences in most cases average?