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[INPAI] HD6790 PK HD4890 Same Frequency - Page 3

post #21 of 47
Quote:
Originally Posted by DuckieHo View Post
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.
This, obviously.

I wonder why most people don't get the article.

It's a great review, indeed.
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post #22 of 47
So they are saying this new architecture in HD 6XXX series is slower then the older one? What i think is HD4890 with 2 years or driver updates.
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post #23 of 47
Quote:
Originally Posted by DuckieHo View Post
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.
The problem with the article, is that in spite of the apparent similarities between the cards, setting the clock speeds the same still does not make it an apples to apples comparison. Which is what they were trying to do, but it's just not that simple.

Because they work in very different ways, each of those cards needs something different in order to perform at its best. So, even though they tried to make both cards the "same". They were actually improving the performance of the 4890 and crippling the performance of the 6790.
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post #24 of 47
Quote:
Originally Posted by wedge View Post
The problem with the article, is that in spite of the apparent similarities between the cards, setting the clock speeds the same still does not make it an apples to apples comparison. Which is what they were trying to do, but it's just not that simple.

Because they work in very different ways, each of those cards needs something different in order to perform at its best. So, even though they tried to make both cards the "same". They were actually improving the performance of the 4890 and crippling the performance of the 6790.
What?

What you just said, proves DuckieHo's point.

Since the cards are virtually identical on paper, all they did was check if the architectural changes between cards do anything.

This is a clock for clock comparison, nothing more.
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post #25 of 47
Quote:
Originally Posted by PanicProne View Post
What?

What you just said, proves DuckieHo's point.

Since the cards are virtually identical on paper, all they did was check if the architectural changes between cards do anything.

This is a clock for clock comparison, nothing more.
Look at the pretty pictures on this page: http://en.inpai.com.cn/doc/enshowcon...74&pageid=7981

The 4890 has one big core, and the 6790 has two smaller cores. They add up to the same overall numbers on paper. But that doesn't mean anything, because they actually function in a completely different manner. The 6790 NEEDS faster memory in order to work at 100% speed.
By underclocking the memory AND overclocking the gpu, they make the problem even worse.

If they want to compare the gpu, fine, set the gpu clock speeds the same. No problem. Just don't touch the memory speed.

But since they created a bottleneck in the memory, they were not comparing gpu performance at all. They were only comparing memory performance.
Even that probably would not be a fair comparison. Since the 4890 was a top of the line card, its memory probably has tighter timings than the memory in the mid-range 6790. Since those timings are not adjustable, even with the same clock speeds, the memory on the 4890 would still have an unfair advantage. In fact, that is probably the main reason why the 4890 came ahead by 1 or 2fps in most tests.
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post #26 of 47
Fail article is fail.
post #27 of 47
Wedge makes a valid point. If you think putting the memory of the two cards at the same speed, especially if it's under-clocking one of them, is putting the two cards at the same level, you're wrong. If both of them had been over-clocked to the same point I'd feel differently about it. But as it stands they are not working with the new architecture at all, they are working against it.

Edit: Man I loved my 4890, such an amazing card. Replaced by my 6850 as it were.
Edited by Pao - 6/9/11 at 5:55am
     
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post #28 of 47
Quote:
Originally Posted by SpeedNuggeT View Post
What? i don't get this article..

Flagship 2009 card, or low end 2011?

Frequency doesn't matter in the slightest.

Plus one most likely consumed half the power of the other....

that's the architectural advantage...
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post #29 of 47
Quote:
Originally Posted by Pao View Post
If both of them had been over-clocked to the same point I'd feel differently about it.
110% Agree.
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post #30 of 47
Is it bad if this makes me want a 6790? I've been playing around with my 4890 and damn do I love this card.

The 6790 would probably go higher frozen too!
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