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| Decreased performance with Crossfire and Eyefinity http://www.wsgf.org/phpBB3/viewtopic.php?f=66&t=20913 |
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| Author: | Storebror [ 20 Nov 2010, 20:51 ] |
| Post subject: | Decreased performance with Crossfire and Eyefinity |
I upgraded to a second HD5850 to run crossfire with my eyefinity setup. I see the the excepted 70-80 fps to ~140 fps increase in Medal of Honor on high settings while playing on a regular 1920x1080 resolution. I can see a similiar increase with all of the games i've tested this far with a single monitor. The weird stuff starts when i turn on eyefinity at 5760x1080. From ~80 fps to 70 fps (decrease!) on Medal of Honor with low settings! In MW2 i get the same framerate (about 70) independent if I use crossfire or not, but it lags a lot more with crossfire enabled. BC2 is just unplayable. My two graphics cards are VTX3D HD5850 (reference) and Powercolor HD5850 PCS+ (factory OC to 760/1050). I'm pretty sure this isnt supposed to happen, or is it? I saw that the HD6850/70 series get about 170-180% scaling with crossfire and Eyefinity, is it possible to get about the same scaling with my cards? Edit: I have tested CCC 10.8, 10.9, 10.10E and 10.11, no difference between them. I use Win7 64-bit |
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| Author: | ZafaZ [ 21 Nov 2010, 04:51 ] |
| Post subject: | Re: Decreased performance with Crossfire and Eyefinity |
Hi, I run crossfire 5850's, I find in almost every game when I run eyefinity the fps are good, but there is stuttering that makes it unplayable, see this thread http://www.widescreengamingforum.com/forum/viewtopic.php?f=64&t=19629 |
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| Author: | Clem Snide [ 29 Nov 2010, 05:58 ] |
| Post subject: | Re: Decreased performance with Crossfire and Eyefinity |
I found the same thing. After experimenting a little with World of Warcraft (which is pretty much the only game I want to run a panoramic monitor with), I found that on a single monitor, I got from 34 to 90 fps with one card, and a stuttery 12-30 fps with CrossfireX. Now, I always thought that, with graphics cards as with girlfriends, two at a time is better than one. Guess I'm wrong. I am currently using only an Asus 5850 Top; my Sapphire 5850 (slightly lower speed, considerably better English-language documentation and support) lies fallow. On my Gigabyte motherboard, the SATA ports interfere with the second graphics card anyway. I went to angled connectors, but it's still too tight for comfort. I'm using one card to drive two monitrs at the moment, and hope to go to three (5040x1050) in the near future. But unless someone can think of a reason why enabling CrossfireX, even with one monitor, would decrease the frame rate, I'm sticking to the single card. |
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| Author: | csaris [ 08 Dec 2010, 15:53 ] |
| Post subject: | Re: Decreased performance with Crossfire and Eyefinity |
This happens because the vsync (even if you force it on in CCC) doesn't lock at 60hz but at 120hz! I've tried 2x5870s in the past and run like crap in crossfinity mode. The only solution for me was to sold them and get 2x580s in sli in which the vsync locks at 60hz FINALLY and every game runs super smooth. |
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| Author: | magstheblue [ 09 Dec 2010, 04:23 ] |
| Post subject: | Re: Decreased performance with Crossfire and Eyefinity |
Clem, when i was playing around with the Cataclysm beta, i noticed horrid performance with crossfire eyefinity. but playing around with the multisampling made an enormous difference. this is the first time ive ever seen raising quality settings give me better performance. i just figgured something was not working properly. give it a go. |
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