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[INPAI] HD6790 PK HD4890 Same Frequency - Page 2

post #11 of 47
hehehe i just upgraded from my 4890. still played lots of games and high settings but i wanted to upgrade and so far have not looked back biggrin.gif
    
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post #12 of 47
Quote:
Originally Posted by damric View Post
This article is fail.

Let's see, HD 4890 released in 2009 for $250. The HD 6790 released just recently for $150.

55nm versus 45nm.

Flagship versus low end of the main stream.

They don't make HD 4890s anymore, so why bother comparing them?

I think the reviewer is mad that his flagship card is eclipsed by mainstream Barts.

Today you could get an HD 6950 for $250.
Since both cards are nearly similar on paper specs wise they made that comparison to see if the architecture, efficiency ...etc improved or not.

Its a good comparison really and it should give you a small idea about what to expect after two years.
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post #13 of 47
The tests were very poorly run. Or perhaps it was done on purpose to make the 4890 look better.
Just look at what they did with the clock speeds. They overclocked both gpu's to 900MHz to keep it even. But they also decreased the memory speed of the 6790 to 3900MHz just to match the stock memory speed of the 4890.
With an overclocked gpu and underclocked memory, they created an artificial bottleneck in the 6790. Memory bandwidth is actually more important on that card since it's a "dual core" while the 4890 is a "single core". The poor little 6790 gpu was being data starved.

At stock gpu speeds, the 6790 would have a 10MHz disadvantage. But I bet that card could win at that speed, if it had full use of its memory capacity. In most tests it was only 1 or 2 fps behind, so it would at least be a tie.
That would show clear progress in power efficiency, price/performance, and image quality over the 2 year difference between those cards.
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post #14 of 47
Quote:
Originally Posted by Crazy9000 View Post
I read 6970 and was about to flame whoever had a test that poorly made.

6790 could make sense though.
Same here!
post #15 of 47
Quote:
Originally Posted by alawadhi3000 View Post
Since both cards are nearly similar on paper specs wise they made that comparison to see if the architecture, efficiency ...etc improved or not.

Its a good comparison really and it should give you a small idea about what to expect after two years.
But it's not a good comparison. The 4890 isn't even on the market right now, and it's common sense that new midrange cards will be able to keep up with 2 year old flagships. This has always been the case. This comparison isn't telling us anything we didn't already know, and certainly not anything valuable.

Artificially changing the clockspeeds on the cards just makes the article even more useless. We can't have an actual comparison if you're underclocking the cards. Way to go. Here's a cookie.
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post #16 of 47
Thread Starter 
I think the point is not comparing the actual cards, but how ATI/AMD's architecture has changed. Sure the memory underclock may not make sense, but from a performance per clock perspective over the years with a continuously tweaked architecture, it is still fairly interesting. And besides, how many times do we see a hex core Phenom X6 put up against a quad core hyperthreaded Intel i7. Completely different chips, but clock for clock is still compared anyway, and I think that it is valid purely for interests sake.
post #17 of 47
Quote:
Originally Posted by wedge View Post
The tests were very poorly run. Or perhaps it was done on purpose to make the 4890 look better.
Just look at what they did with the clock speeds. They overclocked both gpu's to 900MHz to keep it even. But they also decreased the memory speed of the 6790 to 3900MHz just to match the stock memory speed of the 4890.
With an overclocked gpu and underclocked memory, they created an artificial bottleneck in the 6790. Memory bandwidth is actually more important on that card since it's a "dual core" while the 4890 is a "single core". The poor little 6790 gpu was being data starved.

At stock gpu speeds, the 6790 would have a 10MHz disadvantage. But I bet that card could win at that speed, if it had full use of its memory capacity. In most tests it was only 1 or 2 fps behind, so it would at least be a tie.
That would show clear progress in power efficiency, price/performance, and image quality over the 2 year difference between those cards.
Correct, but HD4890 is a tiny bit more powerful than HD6790 even when both @ Stock.

If you look HERE, you'll see that HD5830 > HD6790, and look HERE to see that HD4890 > HD5830. Driver updates and games used might play a small role here but it should be HD4890 > HD6790.
Quote:
Originally Posted by pursuinginsanity View Post
But it's not a good comparison. The 4890 isn't even on the market right now, and it's common sense that new midrange cards will be able to keep up with 2 year old flagships. This has always been the case. This comparison isn't telling us anything we didn't already know, and certainly not anything valuable.
Correct but its not always about the performance or which card to buy, no one will suggest anybody to buy a HD4890 over HD6790, its about how much improvements.
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post #18 of 47
It's interesting but not surprising- 4890 was AMD's highend card at the time (unless you count 4870x2), and your comparing it to a midrange modern card. And the 6970 is killing it in terms of power efficiency: -40w idle / -75w load.
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post #19 of 47
Silly article :/
 
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post #20 of 47
HD6790 = 800 shaders, 40 TMU, 16 Renders with GDDR5 on a 256-bit bus
HD4890 = 800 shaders, 40 TMU, 16 Renders with GDDR5 on a 256-bit bus

So many people are missing the point... this reviewer is comparing architecture. He is not review cost or market position. This is a clock-to-clock compare. When you set the frequencies to be the same, you would expect the new architecture design to be faster. It is not.

It is like comparing a quad-core i7 to a Pentium D with both a 4GHz.
Edited by DuckieHo - 6/9/11 at 4:43am
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