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[TPU] Sapphire Radeon HD 7790 Dual-X Pictured, Tested - Page 6

post #51 of 84
Quote:
Originally Posted by Alatar View Post

Yes and the 7790 is the test chip for GCN 2.0 like the 4770 was a test for 40nm. I just showed that if there are gains being between gcn and gcn 2.0 shown here they are minimal at best

4770 was a great card as well. It paved the way for the 5770 then amd just stopped caring and gave us the 6770 and 7770.

When did amd acquire ati? After the 5770 was released?
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post #52 of 84
Quote:
Originally Posted by Alatar View Post

Yes and the 7790 is the test chip for GCN 2.0 like the 4770 was a test for 40nm. I just showed that if there are gains being between gcn and gcn 2.0 shown here they are minimal at best

Did you expect it to steamroll their own cards? Nope. They used it as a card to test new manufacturing improvements, not to butcher their own 78XX series.
   
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post #53 of 84
Thread Starter 
Quote:
Originally Posted by Stay Puft View Post

4770 was a great card as well. It paved the way for the 5770 then amd just stopped caring and gave us the 6770 and 7770.

When did amd acquire ati? After the 5770 was released?

AMD acquired ATi in mid 2006, think X1900 cards
Quote:
Originally Posted by Artikbot View Post

Did you expect it to steamroll their own cards? Nope. They used it as a card to test new manufacturing improvements, not to butcher their own 78XX series.

Well of course, but it shows that the architecture isn't some second coming of G80, just some minor tweaks.
 
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post #54 of 84
You know, this might be a bit out in left field but stay with me for a moment. What if we are looking at the card wrong? Lets say for a moment this is a test of the GNC2 chips and is released under the 7700 series naming convention for simplicity sake and to not create confusion with the current market cue However we are assuming this is a bump up of the 7770, what if this chip under the current cuing model this would be the 8750 if the entire line was released?

All we know is that this card appears to be the second generation but we have no reference to how it fits in the second generation chipset lineup. This could be a lower end card for that lineup for all we know that is able to bump itself up against the current chips.

It's a little early to speculate as to how the next gen chips will fair from the release of a single chip with no information of it position in the second gen tier.
post #55 of 84
So what your saying is, my 7770 performance would surpass that of a 7790 if I could increase my memory clock 42%.

1300/1600
I don't I can get those clocks, But I can stably achieve 1250 Core/ and 1350 Mem :/
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post #56 of 84
Quote:
Originally Posted by Alatar View Post

Still here, assuming that they're going to be on 28nm that is.

The 7790 tested here has 20% more shaders than a 7770 and is clocked 7.5% higher. That means that assuming no architecture improvements at all the card should be 29% faster than the 7770. In fire strike the card achieves a 39% higher score than the 7770 and in 3dm11 it achieves a 35% higher score than the 7770.

Looks pretty good right?

That's until you factor in the memory clock speeds which are crucial to these cards due to the 128bit memory bus, especially in the very intensive benches ran at 1080p. The 7790 has a 42% higher memory clock speed resulting in 42% more memory bandwidth compared to the 7770.

For example in 3dm11 a 7770 with the amount of shaders a 7790 has would be scoring 1416 while the 7790 is at 1489 (if both were clocked as high). Do you not think that 42% higher memory speeds might explain that 5% higher perf of GCN2.0?

Call me cynical but at the moment AMD's 7970GHz edition consumes about as much power as a Titan, they do not have much transistor budget left at all unless they want to lower the clocks and the card isn't memory bandwidth starved. Where do you see these huge improvements coming from for the 8970? The only possibility I see for a huge jump in performance is a bunch more shaders and those can only be added with additional transistors which will be very hard to add without manufacturing the chip on the 20nm process.

http://www.sweclockers.com/nyhet/16670-fler-detaljer-kring-radeon-hd-7790-bonaire

Looks like it is 896 stream processors and 56 texture units not 796 as first reported.
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post #57 of 84
Physically Nice looking card, Decent performance for 128 bit.. but im good on that.
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post #58 of 84
Quote:
Originally Posted by Alatar View Post

Yes and the 7790 is the test chip for GCN 2.0 like the 4770 was a test for 40nm. I just showed that if there are gains being between gcn and gcn 2.0 shown here they are minimal at best

No, it really isn't.

The HD 7790 is GCN 1.0 through and through with a simple microcontroller monitoring update. All of the other additions are built directly into its driver stack.

Put it this way: if the HD 7790 is a pipe cleaner product for the next gen GCN cores (which it isn't), then AMD is in serious trouble.
post #59 of 84
Quote:
Originally Posted by SKYMTL View Post

No, it really isn't.

The HD 7790 is GCN 1.0 through and through with a simple microcontroller monitoring update. All of the other additions are built directly into its driver stack.

Put it this way: if the HD 7790 is a pipe cleaner product for the next gen GCN cores (which it isn't), then AMD is in serious trouble.

Anandtech's review unofficially called it "GCN 1.1", which sounds about right to me.
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post #60 of 84
Quote:
Originally Posted by Alatar View Post

AMD acquired ATi in mid 2006, think X1900 cards
Well of course, but it shows that the architecture isn't some second coming of G80, just some minor tweaks.

Come on be reasonable....


http://www.anandtech.com/show/6837/amd-radeon-7790-review-feat-sapphire-the-first-desktop-sea-islands

It has less shaders, is 128 bit, has 720 million transistors less and use 86watts. What did you expect?
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