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Crossfire 6870 and 6850


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#1 Mobo Mojo

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Posted 24 April 2012 - 09:16 AM

Posted Yesterday, 04:51 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.


4/24/12
I have searched the freeware listing in the software forum, but nothing jumped out at me.
Can anyone help me crossfire these and check their performance?

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#2 cryptodan

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Posted 24 April 2012 - 09:24 AM

What is it that you are actually trying to achieve?

If it were me, I would just just one card and that is the 6870 and use the other for a spare.

Edited by cryptodan, 24 April 2012 - 09:24 AM.


#3 Mobo Mojo

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Posted 25 April 2012 - 10:22 PM

Actually, I'd like to achieve a base line score for my current configuration before I continue. I'm new and like to learn.
I've been running the 6850 for a year now, without any issues. As far as I can see my current configuration is fine.

I came across a new 6870 for next to nothing, and I'd like to crossfire it with the 6850.

I haven't tried O/C yet, I'd like to establish where I'm at now, before I continue with that.

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

http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_CrossFire/21.html

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 WinDex 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.

#4 cryptodan

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Posted 26 April 2012 - 07:31 AM

I wouldn't go by benching software to determine the true performance, but I would go for true performance in games to determine how well the card is performing.

#5 the_patriot11

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Posted 26 April 2012 - 08:25 PM

your windows experience index will drop with a crossfire setup, it did with mine and ive got two identical cards crossfired. I dont think it was really designed to work well with crossfire-even with 3dmark my scores were somewhat skewed. No, my best method of benchmarking was in game. I used battlefield bad company two-I loaded fraps to monitor my frame rate, and then played for awhile with a single card, and then two. The two cards gave me a much improved framerate and slightly better graphics capability. But in game is really the best way to test out video cards-benchmarking software is often misleading.

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Primary system: Motherboard: ASUS M4A89GTD PRO/USB3, Processor: AMD Phenom II x4 945, Memory: 16 gigs of Patriot G2 DDR3 1600, Video: AMD Sapphire Nitro R9 380, Storage: 1 WD 500 gig HD, 1 Hitachi 500 gig HD, and Power supply: Coolermaster 750 watt, OS: Windows 10 64 bit. 

Media Center: Motherboard: Gigabyte mp61p-S3, Processor: AMD Athlon 64 x2 6000+, Memory: 6 gigs Patriot DDR2 800, Video: Gigabyte GeForce GT730, Storage: 500 gig Hitachi, PSU: Seasonic M1211 620W full modular, OS: Windows 10.

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#6 Mobo Mojo

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Posted 30 April 2012 - 04:38 PM

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.

One of the (other forum) guys told me the second card should be in the PCIe #5 slot.
I tried it 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.

http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_CrossFire/21.html

I'm looking for a performance level that is at least twice that of the 8650 alone.
What am I doing wrong?

I have additional specs here:

http://speccy.piriform.com/results/pg0NyWfryscPfqrbLqqqH3w

#7 the_patriot11

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Posted 30 April 2012 - 06:10 PM

it doesnt always with all combinations, especially if you have different memory types/size differentials. I had a 4890 and a 4850 crossfired for awhile the 4890 had 1 gig of GDDR5 the 4850 had 512 meg of GDDR3. It worked decently well in most games, including a FPS increase, however it created testure issues in BFBC2, so I finally upgraded the 4850 to a 4890. the fact you can mix cards with ATI is nice, but it doesn't always work the way its supposed to and sometimes it takes some added effort to get them to work. And even with identical cards, it will work better with some games/programs better then others-they help me out in battlefield, but theres little to no difference in COD on my system anyway.

As far as what slots to use, consult your motherboard manual, it will tell you which one is your primary, and which one you should put your second card. And if mixing cards, the more powerful card should always be your primary.

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Media Center: Motherboard: Gigabyte mp61p-S3, Processor: AMD Athlon 64 x2 6000+, Memory: 6 gigs Patriot DDR2 800, Video: Gigabyte GeForce GT730, Storage: 500 gig Hitachi, PSU: Seasonic M1211 620W full modular, OS: Windows 10.

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