Tessellation, Texture Filtering, Compute Architecture and Media Processing
Along with these compute and architecture changes come quite a few additional performance improvements starting with tessellation. When NVIDIA introduced Fermi to the world it far exceeded the tessellation performance that AMD offered in their Radeon 5000 series of cards and while both Barts (6800) and Cayman (6900) architectures improved it, NVIDIA still holds a pretty dramatic lead.
Southern Islands looks to improve on tessellation performance by a factor of 4x while not "wasting die space" as they claim NVIDIA has done.
The 9th generation tessellation engine from AMD, built inside the dual geometry engines, improves performance with off-chip buffers and slightly larger caches. The changes AMD has made will improve tessellation at each factor (used to determine tessellation levels) and in many cases, the performance difference is notable.
AMD has provided a graph that demonstrates the scaling ability of the new tessellation engine on Southern Islands when compared to the Radeon HD 6970. Raw tessellation rates have increased from 1.6x to 4x with the majority of the improvement found after a tessellation factor of 9 or 10. Games and applications that utilize tessellation heavily, like Unigine Heaven, Lost Planet 2 and Crysis 2, see jumps from 55% to 139% in relative performance.
Whether or not this is enough to catch the current generation of GTX 580 designs has yet to be seen though with an obvious improvement in pixel shading power as well (with 2048 SPs), the Radeon HD 7970 will obviously become a performance leader.
Being as upfront and honest as they tend to be, AMD discussed their texture filtering quality quite a bit at the technology day in Austin last month. Improvements in the algorithm have greatly reduced the shimmering artifacts seen on certain textures without having to blur it. AMD claims that this is all done without any performance penalty and is a result of simple adjustments on their end – no major hardware changes were needed.
The Southern Islands as a Compute Architecture
Even though AMD was focused nearly completely on the SI architecture as a gaming platform, there is no denying that many of the architectural changes made were the first step in progressing AMD towards a more heterogeneous computing environment. That is after all, the primary goal of the Fusion System Architecture (FSA) detailed by Demers at AFDS this June.
SI has a pair of Asynchronous Compute Engines (ACE) that allow for independent scheduling and work dispatch which will improve multi-tasking efficiency and context switching as well. These engines can operate in parallel with the graphics command processor essentially allowing SI-based parts to work on two varying workloads at the same time. The matching pair of DMA engines can actually completely saturate a PCI Express 3.0 x16 connection with 16 GB/s of bidirectional bandwidth.
As Josh discussed in his original analysis, AMD has the ability to adjust the ratio of single precision to double precision performance on Southern Islands and for their consumer level graphics cards they have chosen a 4:1 mix. While the 7970 is capable of 3.79 TFLOPS of compute, it can handle only 947 GFLOPS of double precision. Because of the move to a vector+scalar architecture though reaching higher utilization of that processing power should be easier for software developers.
The GPU has full ECC protection for DRAM and SRAM and is the first to offer support for OpenCL 1.2, DirectCompute 11.1 and C++ AMP .
Finally, rounding out the new architecture changes is an improved media processing feature that improves performance on SADs – sum of absolute differences. This operation is important for video and image processing algorithms like the one used in AMD’s own SteadyVideo technology. With the Radeon HD 7970 this new QSAD option allows the GPU to handle more than 513 billion calculations per second to keep up with real time playback and adjustment of 1080p 60 FPS content. AMD claims this performance allows the HD 7970 to operate at a 10x performance improvement compared to the company’s own Phenom II X4 980 processor.
I have two 5870’s in
I have two 5870’s in Crossfire connected to three Dell 24″(something like 6080×1200 with bezel compensation on). If I sell both of my cards for ~$300 is it worth the $250 to get a 7970 or should I pick up another 5870 ($150) for triple crossfire or even two 6970’s ($300 each)? I can’t really play BF3 with crossfire enabled and using all three displays, av. FPS is around 20 on high, but I can play on a single display, 1900×1200, on high, av. FPS 55, with crossfire.
In the end I probably wait for the 7970 to get down to $375 and put my 5870’s in an old pc and use it as a space heater.
I want to purchase the 6970
I want to purchase the 6970 MSI Lightning today. I’ll be happy with this card as it overclocks to 1ghz stable. When do you think the “older” cards will drop in price? I’m afraid i’ll have to wait a month, I WANT MY TOYS NOW! (jk)
Will hold on to my 9800GTX+
Will hold on to my 9800GTX+ until prices come down or performance across the board doubles again.
LOL
LOL
If you have a small monitor,
If you have a small monitor, by all means do it.
I’m holding on to the 9500GT
I’m holding on to the 9500GT because it rocks out in BF3 at 12-15 fps and that’s on a lower end pentium D with 256×4 of 533ddr2 and a 40g ide drive.
Whoo hoo, we iz gamin’ !
It doesn’t crash, at all, either, unlike the red cards.
omg did you test those
omg did you test those benchmarks with 0% power control at the CATALYST control center ?. You shoulda test it with +20 power setting, and then try to OC it… you might even get a higher oc since other reviewers get more then 1100mhz out of the core.
We will give that a shot
We will give that a shot after the holiday.
I wonder how the 3 gb Frame
I wonder how the 3 gb Frame buffer affects 3D gaming w/ eyefinity.
It might not help THAT much
It might not help THAT much for 3D as the amount of memory required for 3D isn’t much than standard – just processing power. The reasoning: the textures / data need for the left eye are usually a pretty close match to what is needed for the right eye.
But doesn’t doing 3d require
But doesn’t doing 3d require twice as much processing then traditional graphics? For instance, the metro 2033 normal AVG FPS is double what is in 3d. I wonder if the frame buffer would allow more things to be in VRAM or something would happen to give a boost, slight if any. It doesn’t seem likely from what you are saying, but it would be something interesting to see.
Especially considering how the 69xx series has had 2 and 1 gb variants and the slight hits in perf. on those cards.
Hey Ryan
Thanks for the
Hey Ryan
Thanks for the review..luv your shows. I’ve got a pair of 5870 2Gb’s in Crossfire powering 5760×1080 and an i7930 oc to 3.8ghz. I’m thinking of a pair of these for my next build or maybe just buying a pair of these and clunking them in the existing unit. Of course money and value are an issue. And would I really see any multi player benefit from just upgrading the gpu’s? I guess you’ll be doing a comparison against my setup or similar and that would help for sure. But in the real world would there be any “real” improvement in multi player for me. I mostly need the performance for the hi twitch games–for me COD. I play other games too but don’t need more computing power for them. Goodluck with the new fiber optics….I’m green with envy..that’s where I have problems and limitations.
soldierguy
What I’m getting out of the
What I’m getting out of the 7970 is that they realized Nvidia had a superior architecture and mimicked it. Now how this will affect their drivers will be interesting. If anything this equalizes the 2 companies.
Their charging a high premium for cards because they can. Prices will go down SIGNIFICANTLY when Kepler rears its turtle head……TURTLE!!!
Pretty much all this says is that AMD was early this round but Nvidia again will take the performance crown because if they don’t surpase a product released 6-9 months prior to theirs then it will not bode well for the green machine.
God I sound like a Nvidia shill….
The prices will go down and
The prices will go down and quite quickly. AMDs top end cards are cheaper than Nvidia’s at present and this series will follow suit.
These cards have a premium at the moment (and we are only speculating at present since they arent yet on sale) but competition amongst AMD resellers will see it go down anyway.
I cant blame them for making hay while the sun shiones at the moment. This card is the top end and represents a small percentage of the overall market and they will sell like hotcakes no matter where they are priced to people who want the top end.
Im happy AMD has at least one division thats actually making great product and competing strongly.
I hope you are right Davo.
I hope you are right Davo.
Cheaper by what ? $10 per
Cheaper by what ? $10 per three hundred, or 3 percent…
Yeah, cheaper by three percent.
$10 bucks is not enough to suffer through the driver issues, the crash issues, the lack of new game support issues, the no PhysX issue…
Nope.
To all those who’ve “never had a problem with their radeon cards” congratulations, miracles still do happen.
Gee Mark, telling the truth,
Gee Mark, telling the truth, while calling Nvidia “turtle!” a couple of times is shilling for the eeevil “them” ?
Is this place that much pop culture red amd fanboy that you have to excuse yourself even after calling Nvidia names?
It’s a sad biased world when what is patently obvious to a truthful mind must be parsed and dissed just to try to get along and not be attacked.
I’m frankly sick of it.
It’s okay ot say AMDATI is a copycat and came in late to superior Nvidia styled architecture and they will get beaten by Nvidia in the next release – it’s OK to say it.
In fact, we’ve all probably heard the latter part already in leaked rumor – at which point, for those who keep up, the AMD fanboys went angry wild and screamed it was a group of Nvidia marketing team spammers who leaked $299 and faster… even though Charlie claimed he saw the benchmarks…
Well, in this case time will tell, and thanks for speaking your mind, and no thanks for calling Nvidia turtle twice, and don’t apologize just because red fanboys will attack you, that is, if you can help yourself. Is it really that bad, the attacking of anyone who says a single bad word against AMD and has a good prediction for Nvidia that just makes sense based upon endless years of patterns…that you have to caveat some simple truths and cover the bases with some armor ?
From what I see, AMD takes
From what I see, AMD takes over GTX580 by a ridiculous margin, being absurdly priced. Ryan, raise GTX580 gpu and memory clocks to meet HD 7970 ones, and GTX580 will show same or better performance. In the result, HD 7970 can be buried straight away.
That’s an interesting
That’s an interesting thought. If that pans out, we shouldn’t be hearing about “superior architecture” from those who promote AMD, endlessly, it seems.
However, they will just claim superior tech anyway and blame the “release” drivers and claim future releases will unleash the “true power”. The next breath they will claim AMDATI no longer has driver issues and is now equivalent to Nvidia…
—
YES I say, let’s see an apples clocks comparison.
that makes my life even
that makes my life even harder…
Now I don’t know what to do, buy a 6990 or one 7970 and upgrade later by getting a second one, or even if I should wait for the 7990.
what do you guys think?
Hard to say – as I noted in
Hard to say – as I noted in my review, I almost always pick a single GPU over a dual-GPU solution if performance is close the same. Less hassle to deal with and fewer potential problems.
Since the release of AMD’s
Since the release of AMD’s 7900 series video cards is just
the corner, its best to wait for the release of the mighty
7990, so your options as far as future proof gaming will be
much longer and may infact (if you are using a single full HD
monitor) will never have to upgrade video card again because
that 7990 for sure is one helluva long, bad ass, intimidating,
very very fast video card that will give you the gaming
performance more than you expected and if you’re into movie
editing, its performance (as far as openCL GPU acceleration
support is concerned) will even give you faster renderings
like never before that includes 3d renderings that supports
OpenCL. 🙂
Great review!
Man, is there
Great review!
Man, is there an easy way to get your hand on gfx cards in general and get them shipped overseas? As of right now the 580’s are averaging at $680 over here (in Sweden) and I’d like to upgrade from my 5850.
Upgrading from 5850 to
Upgrading from 5850 to 7970?
Well, sounds like a very good upgrade decision for me!
go for it! 🙂
try amazon .uk/.de or
try amazon .uk/.de or somewhere
They have shipped stuff to me in the US, they might do it to your location as well. especially .uk to Sweden.
HOW DO PEOPLE HAVE REVIEWS
HOW DO PEOPLE HAVE REVIEWS OUT ? the PROPER drivers for PCI-E Gen3 are not even out !-?
Just wondering how much WATTS
Just wondering how much WATTS does my power supply have to be to support it?
i think minimum is 450 Not
i think minimum is 450 Not quite sure ^^
I think nVIDIA will come with
I think nVIDIA will come with a new card that will beat this and be cheaper 🙂
Hey Ryan..you mention a
Hey Ryan..you mention a future review of Eyefinity/Crossfire…For sure I’d like to see that.
Nice review thanks.
This is a great card. I was a
This is a great card. I was a little hesitant to fire sale my 2 MSI 6970 Lightnings (which are amazing) and buying a single 7970, but it was unwarranted. The performance, once easily overclocked (by ATI/AMD’s stock overdrive), is on par with my previous setup on games that supported crossfire. The games that didn’t support it, well this card just blows my previous setup out of the water in that scenario.
Another point that ALMOST made me sit on my hands for a while and wait was going from top of the line custom cards (msi lightnings)to launch day OEM cards. I’ve only purchased cards with after market coolers for the past 3 generations but I just couldn’t wait to try out the 7970. I’m happy to say that while gaming, I don’t notice a difference in fan noise. If anything, it runs cooler than my previous setup (obviously crossfire had a lot to do with it) and it may be actually quieter. While the Lightnings had an excellent HSF along with all sorts of other custom parts, the 7970’s 28nm process just really nullifies the need for a monster HSF setup.
Plenty of great reviews out there on the interwebz, go read those. Just wanted to 5 star this because of the fool with the 3 star review spreading FUD.
http://www.amazon.com/gp/product/B006O714FI/ref=as_li_ss_tl?ie=UTF8&tag=emjay2d-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B006O714FI
just a question..
i’ve bought
just a question..
i’ve bought one of this cards… but i have a problem. When i start gaming the Graphic card heats so much, over 70 degrees Celcios.
Any idea of what the problem?
but will it play Wolfenstein
but will it play Wolfenstein 3d in ultra settings. Just kidding this card rocks add a second card in xfire unstopable
I get 10 or 20 fps of choppy,
I get 10 or 20 fps of choppy, erratic performance in TF2 on w8000 in linux. A software renderer would probably be faster. The linux drivers are garbage.