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[inpai] World's First Review of HD6990 - Page 6

post #51 of 100
Projected 590 vs 6990 results:
http://www.anandtech.com/bench/Product/308?vs=298

Or look up any 580 SLI vs 6970 benchmarks, and the results will be pretty close to real world.
Edited by 2010rig - 3/7/11 at 10:31am
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post #52 of 100
They forgot to put in 570 SLI which beats the 6970Xfire in 1080p and below. 1.2GB memory is only thing gimping it at 2560x1600 when AA is greater than 4x.

Stock comparisons are pointless though since this is OCN. 570 overclocks far more than 6970 on air.
post #53 of 100
Quote:
Originally Posted by 2010rig View Post
Projected 590 vs 6990 results:
http://www.anandtech.com/bench/Product/308?vs=298

Or look up any 580 SLI vs 6970 benchmarks, and the results will be pretty close to real world.
looks about right. Price will be the major factor in choice.
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post #54 of 100
I think nvidia can do a 590 with 2 570 with double memory and they can win.
gtx 590 with 4.8g of vram.
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post #55 of 100
Quote:
Originally Posted by zalbard View Post
You need 3GB 580s for that. CFX'd 6970s seriously choke in a lot of titles.
Not to mention Xfire is bottlenecked at that much bandwidth.

http://www.xtremesystems.org/forums/...d.php?t=266367
Quote:
Originally Posted by Callsign_Vega View Post
"Generating that many pixels at the right quality levels would tax any single graphics chip. Making CrossFire work on this scale presents some challenges, however, as AMD readily admits. The core issue is the fact that the dedicated CrossFire interconnect used for passing completed frames between cards has "only" enough bandwidth to sustain a 2560x1600 display resolution. Even three 1080p displays will exceed its capacity. The alternative is to transfer frame buffer data via PCI Express, which is what AMD does when necessary. Using PCIe works, but it can limit performance scaling somewhat—don't expect to see the near-linear scaling one might get out of a dual-card setup in the right game with a single display. That's not to say mixing CrossFire with Eyefinity won't be worth doing. Based on AMD's performance estimates, frame rates could improve between about 25% and 75% when adding a second GPU with a 12-megapixel, six-monitor array."

http://techreport.com/articles.x/18521/2

There's also a Hardforum review of 5870s crossfire at super high resolutions in which AMD told them to put both crossfire bridges on to eliminate bandwidth problems. In three and four way crossfire you can obviously only use one interconnect per card.

There's more to be found Googling.

If I ran single 30", Tri-Quad crossfire would work fine. I also tried all versions of drivers since the 69xx series was released. On top of that, If I simply lowered the Eyefinity resolution to a certain point, the Tri-Quad crossfire would magically start working again. I found tests that the crossfire bridge was one of the main issues with 2x 5970's not working properly quad-fire. Also found references by AMD that said the crossfire bridge wasn't even designed to handle multi-display bandwidth, let alone resolutions this extreme.

I think all of this clearly points to a crossfire bridge limitation.


The crossfire bridge in which all AMD cards use today is only 900mbits/sec as on the chart (top). There is no such thing as a side-port on the 69xx series.

the cards are only connected in serial so card #1 has to go through card #2 to talk to card #3.

In SLI you can see cards can talk directly to each other and not eat up bandwidth. Card #1 can talk directly to card #3 without interfering with the bandwidth of card #1 talking to card #2.

Edited by PoopaScoopa - 3/7/11 at 11:01am
post #56 of 100
Quote:
Originally Posted by downlinx View Post
very intresting, but i have a hard time trusting dual gpu cards as most games have a hard time fully supporting them.
+1

Sold one of my crossfired 5770's and was a bit surprised by how little difference it made overall.
 
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post #57 of 100
Quote:
Originally Posted by HothBase View Post
+1

Sold one of my crossfired 5770's and was a bit surprised by how little difference it made overall.
It depends on the game really.

I ran a single 5770, then 2x 5770, then 3x 5770. The largest increase I noticed was when I added the second one and the third card almost made no difference at all.
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post #58 of 100
Benching & Resolution my friends... If you want a game machine to have the less problems possible and don't require huge resolutions... just go single gpu
post #59 of 100
Well, I think 6950s in CF are still golden vs this card. According to the review 60% fan speed is unbareable on this card and it reaches 93*C really fast. I think dual Caymans should be better for overclocking and noise. It was to be expected from such a card and the GTX 590 will see the same fate.

You'd expect something better from a 700+ euro card, but that's just me.....
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post #60 of 100
I doubt that price is accurate.

I'm betting it will be $700 U.S. tops. It has to be, as that is about how much 2 6970's are, and they are pretty much equal in performance.

The 6990 will definitely be cheaper than a 590, which I'm guessing will be in the $800 - $900 range.
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