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Did AMD change the architecture of HD7000?

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Logic states that 1024 shaders can not beat 1600 shaders clocked at same speeds in a card with the same amount of ROPS,TMUS, having the same memory bandwidth, right?.....:wtf:

But no, i guess i am an idiot, because god help me to understand how on earth can HD7850 be faster than HD5870 with SIGNIFICALLY lesser shader power even on low resolutions like 1650:

http://www.anandtech.com/show/5625/...-hd-7850-review-rounding-out-southern-islands

I do not believe in things which do not make sense, so please try to explain in great detail the what is the secret behind this? :banghead:

The increased transistor count adds raw FPS performance? :wtf:
The die shrink adds raw FPS performance? :wtf:

I mean come on, this is BS.
 
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HD5000 series = VLIW5, the same architecture ATi had been using since R300.
HD7000 series = GCN, new compute geared architecture. It has less shaders but stronger ones.
 
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Aquinus

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The process in which the GPU was manufactured is smaller on the 7k series cards which equates to lower power usage and higher speeds as well.
 

W1zzard

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HD5000 series = VLIW5, the same architecture ATi had been using since R300.
HD7000 series = GCN, new compute geared architecture. It has less shaders but stronger ones.

that

smaller process does not make things faster (at same clock frequency), but might allow higher clock frequency
 

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The shaders in the later card are more advanced and can do more work per clock. Hence, a lower end model of a newer architecture can often beat the higher end card of an older architecture. For example, my GTX 285 only has about the same rendering power as a lower end GTX 460. On top of that, the 460 supports more features, such as DX11.

It's exactly the same principle as not rating CPU's performance on clock speed alone, since the internal architecture makes a big difference.

Therefore, it's not BS. :)
 
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Even the 6950 preforms better than the 5870 with less shaders.
The 5870 with its old vliw5 architecture have problems of under utilizing its shader power, and this is the one of the reasons why the 2900XT aka R500 failed.
What AMD did with the 4870/RV770 was to simply add a lot more shaders to compensate.

VLIW5 was good in theory but in games it simply have problems fully loading all of the shaders, the lower clocked 6950/Cayman with its simplified VLIW4 architecture is able to practically match/outperform the 5870 with less shaders because it is better utilized.
The newer GCN bases HD7000 series have is much better at distributing the load to all of its shaders because in GCN the shaders are pretty much homogeneous.
The older VLIW have complex heterogeneous shaders and have great theoretical shader power, but in reality we don't live in a perfect world. Games are just not coded to run specifically on AMD's hardware.

Actually W1zzard have some good info in his 7970 review:
http://www.techpowerup.com/reviews/AMD/HD_7970/2.html
 
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eidairaman1

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7700-7900 i believe is GCN where 7600 and less are VLIW4
 
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7900 i believe is GCN where 7800 and less are VLIW4

All HD7000 series are GCN. Only HD6930/50/70/90 were VLIW4. < HD6800 were VLIW5. Not sure about Turks though.
 
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7900 i believe is GCN where 7800 and less are VLIW4

That is wrong. All 7700 and up are GCN. The next APU from AMD (Kabini) will also have GCN shaders.
 

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That is wrong. All 7700 and up are GCN. The next APU from AMD (Kabini) will also have GCN shaders.

i had already updated my stuff, see below
 
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The HD7600 and below are just rebranded chips so they are the same as their HD6000 counterparts.
 

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That has zero to do with anything...

just means the amt of transistors that can be stuffed in the core and meet power and heat requirments
 
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I though that smaller processes of the same die were faster or less latency as the circuit paths are smaller, is this wrong?
 

Aquinus

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That has zero to do with anything...

that

smaller process does not make things faster (at same clock frequency), but might allow higher clock frequency

Yes and no.

Smaller circuitry enables a GPU manufacturer to cram more transistors onto a single GPU. Also since the process is smaller, the distance from any one point to another will be shorter, so a signal will reach where it is going a little faster than it was before. Smaller circuitry tends to favor higher frequencies as well.

All in all, a die shrink does more to help performance and power usage than it does to hurt it.
 

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Yes and no.

Smaller circuitry enables a GPU manufacturer to cram more transistors onto a single GPU. Also since the process is smaller, the distance from any one point to another will be shorter, so a signal will reach where it is going a little faster than it was before.

There is nothing to do with distance. An electron has a speed of light so it really doesnt matter if it 1 km or 1 nm. You wont notice any difference. But you were right about higher frequency. The basic principe of a transistor is a switch. The higher the switching frequency the higher is the output but also the more heat produced. But smaller size means less heat. By shrinking the size of the transistor, it allows higher switching frequency but less heat.
 

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There is nothing to do with distance. An electron has a speed of light so it really doesnt matter if it 1 km or 1 nm.

At ghz frequencies, those tiny distances do make all the difference. That's why smaller circuits clock higher.
 

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There is nothing to do with distance. An electron has a speed of light so it really doesnt matter if it 1 km or 1 nm. You wont notice any difference. But you were right about higher frequency. The basic principe of a transistor is a switch. The higher the switching frequency the higher is the output but also the more heat produced. But smaller size means less heat. By shrinking the size of the transistor, it allows higher switching frequency but less heat.

wrong. electrons are no where near the speed of light.

your concept is all messed up. i would correct it. but its past 1am and i am sleep.y

instead heres a wikilink
http://en.wikipedia.org/wiki/Drift_velocity

and a google result
https://www.google.co.in/search?cli...rceid=opera&ie=utf-8&oe=utf-8&channel=suggest


this is highschool physics. their motion is actually hapazard and not in any particular constant direction. thats why the effective speed is slow.


but when you switch on a light, it doesnt mean that an electron from the battery flows all the way to the light. in fact what happens is one electron knocks out the other. and there is a chain like this and this is how the energy gets transmitted so quickly.


its true you can make the electron go at the speed of light but that depends on how much energy you give them. and 12V isnt a lot of energy :p
 
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AlienIsGOD

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HD6800 were VLIW5. Not sure about Turks though.

but not the same VLIW 5 as the rest of the 6K series. Barts shaders are more refined over 5800 series. 5830 =1120 shaders, 6870 = 1120 refined VLIW 5, which explains the performance difference between 2 cards with the exact same number of shaders
 

scorca

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At ghz frequencies, those tiny distances do make all the difference. That's why smaller circuits clock higher.

But it's not gonne be any faster (in speed not frequency)if you shorten the length.
 

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wrong. electrons are no where near the speed of light.

your concept is all messed up. i would correct it. but its past 1am and i am sleep.y

instead heres a wikilink
http://en.wikipedia.org/wiki/Drift_velocity

and a google result
https://www.google.co.in/search?cli...rceid=opera&ie=utf-8&oe=utf-8&channel=suggest


this is highschool physics. their motion is actually hapazard and not in any particular constant direction. thats why the effective speed is slow.


but when you switch on a light, it doesnt mean that an electron from the battery flows all the way to the light. in fact what happens is one electron knocks out the other. and there is a chain like this and this is how the energy gets transmitted so quickly.


its true you can make the electron go at the speed of light but that depends on how much energy you give them. and 12V isnt a lot of energy :p

Ok, I put it wrong. I should say "energy or signal travelling in a conductor" instead of electron.
 

qubit

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But it's not gonne be any faster (in speed not frequency)if you shorten the length.

Yes it will if you increase the clock frequency. Have you not understood DDD's detailed explanation?

If you don't increase the clock frequency, then the chip will have a slightly lower latency but run at the same speed, because all the clock signals are gated. However, if it was a clockless design, like some ARM chips a few years ago, then it will indeed automatically run faster as you shrink it.
 

scorca

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Yes it will if you increase the clock frequency. Have you not understood DDD's detailed explanation?

If you don't increase the clock frequency, then the chip will have a slightly lower latency but run at the same speed, because all the clock signals are gated. However, if it was a clockless design, like some ARM chips a few years ago, then it will indeed automatically run faster as you shrink it.

I think we are talking about different thing here. Speed is not equal to frequency.
 
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Phusius

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this topic makes me want to get laid. too much nerdfest.
 

qubit

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