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Crossfire 6870 and 6850

Last response: in Graphics & Displays
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April 24, 2012 2:56:30 PM

I have installed both a radeon 8650 and 8670 card with drivers from amd website. I've ran each of them separately without any problems, and bench marked them using 3Dmark06. 6870 scored 18369 3DMarks, 8650 scored 17630 3DMarks.
I'm unsure how to rate these scores, as the website will not allow me to "add to compare" list because my settings apparently are not set to default. Can anyone suggest a freeware program to rate performance?
I'm ready to crossfire them, but would like to know where I'm at before I get started.

More about : crossfire 6870 6850

April 24, 2012 3:54:52 PM

you can crossfire identical cards
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April 24, 2012 4:00:25 PM

@Alvine - The AMD CrossfireX Chart shows that you can crossfire the HD6870 with the HD6850 as well as other similar card combinations.

Sorry Mobo, but I don't have any other information for you.

-Wolf sends
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April 24, 2012 4:04:51 PM

ah sorry i thought they were more strict like nvidia
you can use windows experience index as your reference
also try passmark, furmark
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April 24, 2012 4:08:33 PM

crossfiring 6870 and 6850 it's not a good idea..

it's slower than cf 6850.

sell your 6870 and grab another 6850..
or,
sell both of your graphics card, and grab at 7850 or 7870.

almost same performance raw but without multicard issue...*and less power*
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April 24, 2012 4:09:19 PM

If things still hold true,they will both run as 6850 crossfire,the 6870 will downclock to the 6850's speeds.
where your at will depend on system specs/games/resolutions etc...

picked the 1st one on google
http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_C...

also(hopefully link is right)
http://www.anandtech.com/bench/Product/301?vs=302

A 6870/6850 setup will run exactly as a 6850 xfire setup,if you o/c the 6850 to a 6870,it will run as a 6870 xfire.

however,I have been very lucky and have never had any issues with xfire(all series since the 3xxx's)
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April 24, 2012 4:28:31 PM

Thanks, I did keep searching and ran a bench mark on the Radeon HD 6870 using cinebench freeware. It's running 51.9 fps.

The CPU, AMD Phenom II X4 965 Black Edition Deneb 3.4GHz scored 3.75 pts in a rendering test.

I was expecting more fps, is the CPU bottle-necking?
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April 24, 2012 4:43:47 PM

Mobo Mojo said:
Thanks, I did keep searching and ran a bench mark on the Radeon HD 6870 using cinebench freeware. It's running 51.9 fps.

The CPU, AMD Phenom II X4 965 Black Edition Deneb 3.4GHz scored 3.75 pts in a rendering test.

I was expecting more fps, is the CPU bottle-necking?



your CPU is fine,Have you ever tried to O/C it?
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April 25, 2012 5:19:50 PM

I haven't tried O/C yet, I'd like to establish where I'm at now first.

I compared my results to tests using 3dmark06 at 1920x1200

http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_C...

My 6850 card alone scored slightly higher (17630 3Dmarks vs 17383), but when I
put it in crossfire with the 8670, I scored 19192 vs their result of 23681.

I assume the 6870, installed in the PCIe #1 slot, will be seen as the master, while the 8650 in the #2 will be the slave.

Also my Win Dex graphics dropped from 7.8 for the 8670 alone to 7.7 when in crossfire, which was where I started when I had the 6850 running alone.

Once I get all this stabilized, I'll try O/C.



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April 25, 2012 6:10:35 PM

Make sure you have the secondary graphics card in the correct slot. From the specs on your motherboard:

Quote:
If you want to install two graphics cards, please use PCI_E1 & PCI_E5 slots


-Wolf sends
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April 26, 2012 3:34:40 AM

Thanks, Wolf
Tryout tonite let you know...
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April 28, 2012 12:43:40 AM

No big change with 8670 in slot 1, 6850 in slot 5.

I scored 19092 (-100 from prior result) vs their result of 23681, for two 6850s Xfire.

fps change is very slight.

Any thoughts other than selling and just get a 7000 series?

I'd be happy just to know I'm getting everything I can from
this cross-fired setup.

I had an issue with the Hero Editor in Darkspore producing glowing
bodies and weapons. It stopped when I returned to the 6870 alone.

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April 30, 2012 10:56:01 PM

Updated information

I've been running that 6850 card, but wanted to boost things up to power two 23" monitors and keep max graphics settings, plus fps.

I added an 6870 in crossfire (both are AMD radeon xfx cards)

I assume the 6870, installed in the PCIe #1 slot, will be seen as the master, while the 8650 in the #2 will be the slave. That's where I started.

I moved the second card to the PCIe #5 slot, as Wolfshadow suggested,
without any measurable change.


4.30.12 Driver and Catalyst versions

Driver Packaging Version 8.951-120308a-135594C-ATI
Catalyst Version 12.3
Provider Advanced Micro Devices, Inc.
2D Driver Version 8.01.01.1235
2D Driver File Path /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/CLASS/{4D36E968-E325-11CE-BFC1-08002BE10318}/0002
Direct3D Version 7.14.10.0894
OpenGL Version 6.14.10.11566

I had a decrease in performance when benchmarking the crossed and uncrossed configurations within the DiRT 3 benchmark.

DiRT 3 benchmark 4.30.12

Resolution 1920 x 1080 running one 23" monitor
Refresh Rate 60
Multisample 4x MSAA
VSYNC OFF
Aspect Ratio AUTO

All other Graphics HIGH
Post Processor HIGH

6870 PCIe slot 1
fps AVG 85.7, MIN 65.5

6870 PCIe slot 1
6850 PCIe slot 5
fps AVG 68.9, MIN 52.3

Bottom line:
The 6850 did fine alone
The 8670 did better alone
The two cards in crossfire did not increase performance. They together preform at a lower fps than the 8670 alone.
And, in crossfire, they are not even close to results I've seen for two 8650 in crossfire, which is not what I would've expected.
(Quaddro warned me earlier in this thread)

6850 cross fire test
http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_C...

I'm looking for a performance level that is at least twice that of the 8650 alone.

Has anyone used the AMD overdrive to speed up a card?
How much would I safely speed it up to better match the 6870?
From what I've read, it should handle 80-90c, although that's high.
Is this a Catalyst version 12.3 issue?

I hope someone out there has been through this and can tell me what they did.

Thanks in advance,
Mo

I have additional specs here:
http://speccy.piriform.com/results/pg0NyWfryscPfqrbLqqq...
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