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Old Apr 16, 2008, 07:22 PM   #1
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ATI Technologies Rage3D Exclusive: Altair has a well-kept secret

Rage3D investigates what happens when a computing powerhouse teams up with a top-notch developer.

Check out Assassin's Creed - First DX10.1 Title?
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Old Apr 16, 2008, 07:42 PM   #2
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Nice find and good job
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Old Apr 16, 2008, 08:04 PM   #3
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Amazing! This could be the first title that benefits from Vista SP1 and an ATI card on board.

Awesome work, Morgoth!
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Old Apr 16, 2008, 08:15 PM   #4
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Good piece of journalism.
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Old Apr 16, 2008, 08:28 PM   #5
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Nice article!
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Old Apr 16, 2008, 08:30 PM   #6
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Great catch Morgoth and I read every single word. Was a very good read.

One other thing I can think of to possibly better support the case is... have you noticed any difference in lighting?
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Old Apr 16, 2008, 09:21 PM   #7
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is it true this game has downgraded graphics from the console version? worse texturing for example.
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Old Apr 16, 2008, 10:22 PM   #8
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Journalistic dynamite!
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Old Apr 16, 2008, 10:27 PM   #9
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Journalistic dynamite!
Indeed. Well done.
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Old Apr 16, 2008, 11:59 PM   #10
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Awesome discovery.

I'm seeing this linked to all over...gonna bring a lotta traffic to R3D
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Old Apr 17, 2008, 12:13 AM   #11
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So if this pans out to be true , when is ati going ot send guys to all the developers to implment this . I hope they don't scew up like they did with 3Dc
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Old Apr 17, 2008, 01:42 AM   #12
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Impressive, did`nt think 10.1 would see such a sizeable gain.

Nice Morgoth.
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Old Apr 17, 2008, 02:18 AM   #13
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Interesting read and interesting stuff right here!

Thanks Morgoth!
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Old Apr 17, 2008, 03:05 AM   #14
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It looks like HDR-Correct AA has been implemented by those screenshots.

HDR lighting calculates colors and lighting outside a range that your monitor can display; hence why it's called high dynamic range. After the calculations are done, the lighting is clipped to a value your monitor is capable of displaying.

The AA resolve step is the final step in the antialiasing process in which the subpixels are sampled to determine the final color of each pixel on the screen.

The problem with HDR and AA is that normally, MSAA resolve is done before the lighting values are clipped. The range of contrast before clipping is much greater. The extreme contrast ranges present in HDR rendering means that if you have an area of very low contrast bordering an area of very high contrast (such as what was shown in the screenshot), they will saturate each other and cancel each other out, negating the benefit of antialiasing.

The only way to compensate for this is to change the way resolve is done and the way the subpixels are sampled to account for the higher range of contrast. This is known as HDR-Correct Antialiasing.
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Old Apr 17, 2008, 04:34 AM   #15
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Good find guys
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Old Apr 17, 2008, 05:40 AM   #16
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Does NV hardware also get 20% performance gain with the AA under Vista SP1?

Nice article by the way
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Old Apr 17, 2008, 05:46 AM   #17
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Quote:
Originally Posted by becco View Post
Does NV hardware also get 20% performance gain with the AA under Vista SP1?

Nice article by the way
That's the billion dollar question, isn't it? I don't have nV HW on hand though.
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Old Apr 17, 2008, 05:57 AM   #18
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Dun dun dun!

Fantastic job Morgoth, the RV770 barbie doll is on its way to you.

I'm a little barfed that there's no easy, direct revelation of what (version of) API an application/renderer uses, even until now. That would make for easier conclusions.
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Old Apr 17, 2008, 06:18 AM   #19
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Wow, crazy, first i read the article i think i'm dreaming

Quote:
"Ubisoft are at the forefront of technology adoption, as showcased with the fantastic Assassin’s Creed title. In this instance our developer relations team worked directly with the developer and found an area of code that could be executed more optimally under DX10.1 operation, thus benefiting the ATI Radeon HD 3000 Series."
Finally ATi start working with game DEV's, the only thing i not undestand why they not made any PR hype? this is the world first game what support DX10.1, ATi and S3 the only companys with DX10.1 cards out.
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Old Apr 17, 2008, 07:33 AM   #20
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Quote:
Originally Posted by Morgoth Bauglir View Post
That's the billion dollar question, isn't it? I don't have nV HW on hand though.
I don't know if it's a "billion"dollar question at this point as it's only one game, but a comparison would have been nice.

I saw some benches on another site that had ATi hardware behind NVIDIA hardware at this game, so the question becomes "Does a 20% gain with SP1 matter to the buyer, and will other games implement in the near future if it does matter?"

http://www.pcgameshardware.de/&menu=...=637474&page=1

In any case, for AMD owners who like Assassins Creed, good news indeed!
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Old Apr 17, 2008, 07:39 AM   #21
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'looks at my 2900XT's'
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Old Apr 17, 2008, 08:50 AM   #22
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Quote:
Originally Posted by demowhc View Post
'looks at my 2900XT's'
Don't worry, we know what those 2 cards will become when summer comes.
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Old Apr 17, 2008, 10:06 AM   #23
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Quote:
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Don't worry, we know what those 2 cards will become when summer comes.
Looks at my passive HD2900
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Old Apr 17, 2008, 10:07 AM   #24
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*looks at my x1800gto
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Old Apr 17, 2008, 12:06 PM   #25
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Quote:
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*looks at my x1800gto
Looks at my computer screen wondering why others are looking at their video cards.....ok, so I am at work and take the side of my case off to ogle my card. X2900.
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Old Apr 17, 2008, 12:10 PM   #26
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Looks at my computer screen wondering why others are looking at their video cards.....ok, so I am at work and take the side of my case off to ogle my card. X2900.
We SM3.0/SM4.0 guys are looking at our card trying to imagine them being SM4.1 cards....
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Old Apr 17, 2008, 12:27 PM   #27
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Quote:
Originally Posted by TheNGTV View Post
Don't worry, we know what those 2 cards will become when summer comes.
lol summer just finished here and most days during the peak of summer were over 40c.. with 2900XT crossfire overclocked blowing hot air faster than my aircon could cool it

note to self *change video cards before next summer*
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Old Apr 17, 2008, 02:35 PM   #28
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Good article and thanks for the info.

This might make the HD 3870 X2 a little more attractive to some and its price has fallen to 359usd with rebate @ Newegg.

http://www.newegg.com/Product/Produc...82E16814241070

Two HD 3870s for around 129usd a pop after rebate would be a better deal.

Last edited by Blacklash : Apr 17, 2008 at 02:41 PM.
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Old Apr 17, 2008, 02:55 PM   #29
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I'd enjoy seeing Rage3D user tests published to verify these numbers with both 10.1 and non-10.1 supporting video cards.
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Old Apr 17, 2008, 03:06 PM   #30
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nvidia cards dont support dx 10.1 so they likely wouldnt have an increase.
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