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[INPAI] HD6790 PK HD4890 Same Frequency - Page 4

post #31 of 47
Quote:
Originally Posted by wedge View Post
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.
Good point.... again, this article is a clock-to-clock comparison. I see you understand what it trying to achieve. A lot of people are just commenting on price, avaliability, etc... which is NOT the point of the article.

For completeness, the author should have ran benchmarks at different clocks. i.e. Both cards at 900/3900, 900/4200, 900/3600, 800/3900, etc. This would tease out more information about the design differences.


Quote:
Originally Posted by Pao View Post
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.
That is sort of the point.... to see what the differences are clock-for-clock. See above about completeness though.


Quote:
Originally Posted by ZealotKi11er View Post
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.
There are some older games in there which AMD has mastered optimizing by now.
Edited by DuckieHo - 6/9/11 at 6:45am
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post #32 of 47
Quote:
Originally Posted by Evil-Jester View Post
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
This, however i went from 4890 CFX to a single 6950 and despite what lots of people said, i saw a pretty good increase in most games 10 to 30 percent. Plus it solved my issues i was having with power.
post #33 of 47
Quote:
Originally Posted by Kevlo View Post
This, however i went from 4890 CFX to a single 6950 and despite what lots of people said, i saw a pretty good increase in most games 10 to 30 percent. Plus it solved my issues i was having with power.
I went from a 4890 to a 470 and saw quite a notable difference. However, for fun's sake I've gone to another 4890
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post #34 of 47
Quote:
Originally Posted by xxbassplayerxx View Post
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!
It's not bad at all... Actually, I'd forgotten that the 6790 even existed until this post reminded me. Now I have an idea of Crossfiring one with my 6850 (yes that does work). Won't be quite as good as 2 6850's, but it will still be a big boost, and it will be cheaper than a second 6850.
Since it is based on the 68xx gpu, it's Crossfire performance does scale very well. I think that might be the solution I've been looking for...
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post #35 of 47
I cant help wondering if driver optimization isnt playing a role here. 4890's have been around for 2 years now, the 6790 has only been out for 2 months. I don't know if that counts since it's a Barts core and the other Barts family members have been around a little while longer.
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post #36 of 47
I agree the comparison has some merits,but the whole story is not told.One of the best architecture improvements is power draw and heat for the same speeds,and also the faster memory,which was gimped.Also the 6790's gimped shaders kind of throws of the comparison,since Barts was not designed this way.A 6850 would have been a better pure comparison of architecture.The biggest advantage of the 6790 is supposedly better overclocking over the 6850,due to the dual 6-pin power,which is also not considered here.All in all-comparing todays entry level GPU against yesterdays top dog reflects well on the 6790.I really havn't pushed mine yet,even without voltage increase 1040MHz is reached.Temps have not gone above 55c at any time.Add in the lower heat which translates into even more overclocking,the 6790's would no doubt totally crush the 4890's in crossfire,for half the price.
Edited by Redwoodz - 6/9/11 at 8:55am
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post #37 of 47
This is like comparing a Honda Insight to a Honda CVCC and saying they both can do 65mph, lol. Then saying, omg they can both do 65mph! The difference is how they achieve it.
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post #38 of 47
The architecture might be slower clock/clock in this test but with the decreased size/power draw, AMD was able to pack more transistors in there to make a better performing card for their high end.

Also, who knows if the 4xxx architecture would scale up with transistor count as much as the 6xxx series does.
    
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post #39 of 47
3870 X2 VS. HD 6790 trollface.jpg
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post #40 of 47
IMO the 6790 is still the winner in terms of technological advancements since it consumes WAY less power
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