AMD's Radeon HD 5870: Bringing About the Next Generation Of GPUs
by Ryan Smith on September 23, 2009 9:00 AM EST- Posted in
- GPUs
Angle-Independent Anisotropic Filtering At Last
For a number of years now the quality of anisotropic filtering has been slowly improving. Early implementations from AMD and NVIDIA were highly angle-dependent, resulting in a limited improvement to image quality from such filtering. The angle-dependent nature lead to shimmering and other artifacting that was not ideal.
As of the previous generation of cards, the quality of anisotropic filtering had become pretty good. NVIDIA’s best filtering mode was pretty close to angle-independent, and AMD’s only slightly worse. Neither was perfect, but neither was bad either.
The Radeon HD 4890
The GeForce GTX 285
However so long as no one had an angle-independent implementation, there was room to improve. And AMD has gone there. The anisotropic filtering algorithm used by the 5000 series is now truly and completely angle-independent. There are no more filtering tricks being used.
The Radeon HD 5870: Perfection
As you can see, the MIP maps in our venerable D3D AF Tester are perfectly circular, the hallmark of an angle-independent implementation. With angle-independent filtering, this effectively marks the end of the filtering arms race. AMD has won, and should NVIDIA catch up in the future the two would merely be tied. There’s nowhere left to go for quality beyond angle-independent filtering at the moment.
AMD tells us that there is no performance hit with their new algorithm compared to their old one. This is a bit hard to test since we can’t enable the old algorithm on the 5870, but certainly whatever performance hit there is, is similarly minor. In all of the testing we’re doing today, you will see results done with 16x anisotropic filtering used.
What you won’t see however is a difference, particularly with our static screenshots. When discussing the matter, AMD noted that the difference in perceived quality between the old algorithm and the new one was practically the same. After looking at matters we find ourselves in agreement with AMD; we were not able to come up with any situations where there was a noticeable difference, beyond the obvious AF quality tests that are designed to identify such changes.
Regardless of the outcome, AMD deserves kudos for making angle-independent anisotropic filtering happen. It’s demonstrably perfect filtering with no speed hit versus the previous generation of filtering; making it in essence a “free” improvement in image quality, however slight the real-world results are. We’re always ready to get better image quality out of our video cards, after all.
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Agentbolt - Wednesday, September 23, 2009 - link
Informative and well-written. My main question was "how future-proof is it?" I got the Radeon 9700 for DirectX9, the 8800GTS for DirectX10, and it looks like I may very well be picking this up for DirectX11. It's nice there's usually one card you can pick up early that'll run games for years to come at acceptable levels.kumquatsrus - Wednesday, September 23, 2009 - link
great article and great card btw. just wanted to point out that the gtx 285 also had 2x6 pins only required, i believe.Ryan Smith - Wednesday, September 23, 2009 - link
That's correct. I'm not sure how "275" ended up in there.SiliconDoc - Wednesday, September 23, 2009 - link
One wonders how the 8800GT ended up on the Temp/Heat comparison, until you READ the text, and it claims heat is "all over the place", then the very next line is "ALL the Ati's are up @~around 90C" .Yes, so temp is NOT alkl over the place, it's only VERY HIGH for ALL the ATI cards... and NVIDIA cards are not all very high...
-so it becomes CLEAR the 8800GT was included ONLY so the article could whine it was at 92C, since the 275 is @ 75C and the 260 is low the 285 is low, etc., NVidia WINS HANDS DOWN the temperature game...... buit the article just couldn't bring itself to be HONEST about that.
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What a shame. Deception, the name of the game.
Ryan Smith - Wednesday, September 23, 2009 - link
The 8800GT, as was the 3870, was included to offer a snapshot of an older value product in our comparisons. The 8800GT in particular was a very popular card, and there are still a lot of people out there using them. Including such cards provides a frame of reference for performance for people using such cards.SiliconDoc - Wednesday, September 23, 2009 - link
Gee I cannot imagine load temps for the 4980 and 4870x2 exist anywhere else on this site along with the 260,275, and 285... can you ?Oh, how about I look...
Finally - Wednesday, September 23, 2009 - link
Nvidida-Trolls tend to turn green when feeling inferior.SiliconDoc - Wednesday, September 23, 2009 - link
Turning green was something the 40nm 5870 was supposed to do wasn't it ?Instead it turned into another 3D HEAT MONSTER, like all the ati cards.
Take a look at the power charts, then look at that "wonderful tiny ATI die size that makes em so much money!" (as they lose a billion plus a year), and then calculate that power into that tiny core, NOT minusing failure for framerates hence "less data", since of course ati cards are "faster" right ?
So you've got more power in a smaller footprint core...
HENCE THE 90 DEGREE CELCIUS RUNNING RATES, AND BEYOND.
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Yeah, so sorry that it's easier for you to call names than think.
RubberJohnny - Wednesday, September 23, 2009 - link
LOL...replying to your own post 3 times...gettin all worked up about temps...PUTTIN STUFF IN CAPS...Looks like this fan boy just can't accept that the 5890 is a great card. Not surprising really, these reviews always seem to bring the fanboys/trolls/whackos out of the woodwork.
Once again, good job AT!!!
JarredWalton - Thursday, September 24, 2009 - link
SiliconDoc, you should try thinking instead of trolling. Why would the maximum be around 90C? Because that's what the cards are designed to target under load. If they get hotter, the fan speeds would ramp up a bit more. There's no need to run fans at high rates to cool down hardware if the hardware functions properly.Reviewing based on max temperatures is a stupid idea when other factors come into play, which is why one page has power draws, temperatures, and noise levels. The GTX 295 has the same temperature not because it's "as hot" but because the fan kicked up to a faster speed to keep that level of heat.
The only thing you can really conclude is that slower GPUs generate less heat and thus don't need to increase fan speeds. The 275 gets hotter than the 285 as well by 10C, but since the 285 is 11.3 dB louder I wouldn't call it better by any stretch. It's just "different".