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[Nordic] RV770 has 800 SPs, breaks 1.2TFLOPS, final clocks

post #1 of 108
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Quote:
Remember how we told you that Eastern sources claimed that RV770 has 800 shader processors, not just 480 shader processors? When we look at the slide presented to us by a reliable source, we can only conclude that they were right. AMD evidently planted the stories of 480 shader processors (it's not uncommon for AMD/ATI to plant stuff). The slide tells us three things about both Radeon HD 4850 and 4870. First of all that they both sport a whopping 800 shader processors, but also the clock frequencies and they're individual calculation capacity measured in FLOPS. We've already told you that Radeon HD 4850 will launch at 625MHz and that AMD will clock the 4870 at at least 100MHz more, the slide says 750MHz.

Each shader shader unit is capable of 2 FLOPS, and since we now have 800 units, this means that Radeon HD 4850 with its 625MHz will hit exactly 1TFLOPS. That should explain why AMD/ATI chose that specific frequency. Radeon HD 4870 with its 750MHz core will have 20% more processing power available and hits 1.2TFLOPS. A decent quad-core processor can do up to 100GFLOPS. This is certainly a slap in NVIDIA's face. AMD's mainstream chip can do more FLOPS than NVIDIA enthusiast chips, and AMD's coming high-end chips will pack twice the FLOPS...
Source
Edited by ultralord910 - 6/7/08 at 9:05am
post #2 of 108
hmm, interesting. These things are looking better and better.
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post #3 of 108
Quote:
Originally Posted by dralb View Post
hmm, interesting. These things are looking better and better.
Yep I have said it before...this makes me think HD4870 for me ...
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post #4 of 108
.....all this AMD talk is kinda making me regret going 780i...
   
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post #5 of 108
So when is this card being released? It's going to beat the GTX-280, right?
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post #6 of 108
What I am confused about is, what is different between the 4850/4870 except for core/mem frequencies?

That si the only difference i can see, which means the 4850 is just an underclocked 4870. So you should be able to just by a 4850 and overclock it?

Or are they using difference core processors? I'm confused

But either way, i really hope these take off! Seems like ATI are trying pretty damn hard this time round.
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post #7 of 108
Quote:
Originally Posted by IcedEarth View Post
What I am confused about is, what is different between the 4850/4870 except for core/mem frequencies?

That si the only difference i can see, which means the 4850 is just an underclocked 4870. So you should be able to just by a 4850 and overclock it?

Or are they using difference core processors? I'm confused

But either way, i really hope these take off! Seems like ATI are trying pretty damn hard this time round.
Even if it is just an underclocked version i would bet that the 4870 would achieve higher clock speeds.
   
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post #8 of 108
Quote:
Originally Posted by Outcasst View Post
So when is this card being released? It's going to beat the GTX-280, right?
No, the 4870 is still their mainstream part. Those theoretical FLOP numbers are very high, but you can't really expect them to translate directly into gaming performance. The HD3870 actually had over 100 more GFLOPS than the 8800Ultra, for example. You can, however, expect the HD4870X2 (August-ish, I think) to compete with the GTX280. Can't say for sure yet which one will come out on top, but it should be an epic battle.

Regardless, the 4800 series as a whole is shaping up to be quite impressive especially when you take price into account.
post #9 of 108
Quote:
Originally Posted by Outcasst View Post
So when is this card being released? It's going to beat the GTX-280, right?
ya right in a perfect world where i can fly ) dude GT280 will smoke the 4870 ... but still it will be a very powerful card
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post #10 of 108
I'll hold out for the 4870X2 for my gaming rig....... but that 4850 is definitely going in the htpc
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