AMD: R8xx Speculation
- Thread starter Shtal
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Right, forgot that there really are 2 independent (4-wide) rbes attached to each MC, so that's how they can disable half of them.
In fact it has the same amount of rops (though as you stated they are clocked a bit lower).
Ok, from that perspective (comparing to HD4890) it doesn't look too bad. It could be quite a bit rop-limited though hence might not be much faster (despite the relatively large alu advantage and only small rop disadvantage due to clocks).
I'm a bit unsure though you could really get lucky and power draw will be much lower. I bet the high power draw has at least as much to do with the likely relatively high voltage rather than leakage variance. At least idle power draw should be way lower.
I never really considered the HD4890 a really good card though neither, high power draw, relatively high price and not so good price/performance ratio compared to HD4870/HD4850...
But as long as it's priced appropriately (not too close to HD5850) I guess it's ok. Should look quite good compared to a GTX275, and in contrast to HD5770 at least you get DP support
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Cypress is actually 8 32-bit memory channels.
Oh my it's the new 6800LE
Seriously though, it seems to do what it needs to do.. slot into the huge hole between Cypress and Juniper, and save some Cypress chips from the garbage bin.
Perhaps not positioned that attractive because there aren't that much chips to salvage- that can be sold at higher ASPs, either?
leoneazzurro
Regular
Also the 4890 has 16 ROPs
This card should perform at 4890 levels, probably.
(Attribute interpolation in the shader core will cost some performance).
Also the 4890 has 16 ROPs
This card should perform at 4890 levels, probably.
(Attribute interpolation in the shader core will cost some performance).
For some reason I was under the impression that the 4890 had 32 ROPs but those in Cypress had double the throughput. But you and mczak are right, it only has 16.
That must've changed last minute then edit: see posted slide. And if it really hits 1xx Euros soon, it should do alright.
If you were me, though, you'd not see any reason to downgrade from an HD 5870.
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Are 16 ROPs possible or not? :smile:
Any reason why it would not? Plus, the slide from the last page of this thread looks quite authentic AMD to me.
That must've changed last minute then edit: see posted slide. And if it really hits 1xx Euros soon, it should do alright.
If you were me, though, you'd not see any reason to downgrade from an HD 5870.
I don't even see it as much of an upgrade from a 4850 1 gig. Going to wait for offical benchmarks but if its only 4890 level power the I will continue waiting for the 5850 to hit the $200 and under price bracket.
But at least all diagrams I've seen indicate 4 memory controllers (with 2 32 bit memory channels), not 8 32 bit memory controllers.
I guess it would be impossible to disable rops (without halving memory interface width) if there were 8 memory controllers with one rbe attached to each.
There was a bit more "technical" slide-set somewhere which clearly showed it having 8x32 rather than 4x64
You're planning on buying ATi?
Can anyone explain how the shaders, tmus, and rops are disabled between the 5870, 5850, and 5830, given that each product is using the rv870 cypress die?
What do these 5 added transistors on the 5850 reference board do, and is there a datasheet for cypress chip or pcb?
How will custom AIB HD5830 non reference boards recognize a neutered cypress die of 1120/56/16?
What do these 5 added transistors on the 5850 reference board do, and is there a datasheet for cypress chip or pcb?
How will custom AIB HD5830 non reference boards recognize a neutered cypress die of 1120/56/16?
You're planning on buying ATi?
Yes.
For the modern age of video cards I've owned a geforce sdr , a radeon 64mb , a radeon 8500 , a radeon 9700pro , a geforce 5800ultra (that quickly went to my little sister and i kept the 9700pro) a radeon x800xt pe , radeon 1900xtx , radeon 3870x2 (never a dual chip board again in my life) to a raden 4850 1 gig.
I have no real complaints with ati and haven't since my radeon 64mb. I got burned twice by nvidia with the geforce sdr and then the geforce 5800ultra. Though my tnt was amazing and most likely the video card I kept the longest. Before that I have a rivia 128 and some power vr gpu. For awhile in our extra box we ran a power vr gpu one of the last they made for the desktop.
http://translate.googleusercontent....gle.pl&usg=ALkJrhglGU3IP1W4K5YawAX6YP3k-YL6cg
First review od HD5830
First review od HD5830
Here are these two slides:
Well 8 channels but 4 controllers.
That's at least the impression I got from the "usual" pic:
http://techreport.com/articles.x/17618
And the above slides don't contradict that.
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