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FPS drop when changing monitor?

Last response: in Graphics & Displays
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August 1, 2012 8:47:22 PM

Ok this is wierd. I have currently 3 monitors. Radeon HD 4650 (modified PCI-E x1 slot) running one 1280x1024 monitor and Radeon HD 4870 running 1920x1080 and 1280x1024 monitors. All smooth, no problems.

But problem appears, when I'm trying to connect my LG M208WA 1680x1050 display. It works alone smoothly 60fps, but if I connect any other display with it, M208WA's fps drops half, but not other monitors. I tried every possible combination (switched between graphic cards and VGA-DVI).

I can't figure this one out. How changing monitor can cause fps drop? I installed M208WA's drivers and checked everything in CCC. Help me please!
August 2, 2012 3:45:24 AM

Well I would expect to see a performance hit in this situation... Two monitors takes more resources to run than one. I'm a bit unclear here, have you run the 1920 by1080, and the 1280 by 1024 monitors at the same time just fine? 1680 by 1050 is an odd resultion it could just not like it. You said you have a 4650 Modified pcie 1x slot what do you mean by that? Did you modify it if so the port or the card, if so how?
August 2, 2012 7:58:52 AM

Yeah, I'm runnin at this moment the 1920x1080 AND the 1280x1024 resolutions at HD4870, both fine. That modified PCI-E x1 means a slot extender, so it shouldn't make any harm.

I thought that this will fix my problem, but it didn't:

Run 1680x1050 resolution with HD4650
Run 1920x1080 AND 1280x1024 resolutions with HD4870 (like it is now)

I used HD4650 for playing with my 1680x1050 monitor and it worked like a charm with 60fps. Can monitor cause it? If I connect that monitor with HDMI, will that help?
Related resources
August 2, 2012 10:12:53 PM

bumping up.
a b C Monitor
August 2, 2012 10:15:44 PM

bumping up. < don't bump
August 2, 2012 10:41:40 PM

I would suggest using HDMI If possible to see if that makes a difference. Are you doing any gaming or are you just, dual monitoring?
August 2, 2012 10:44:24 PM

chad2625 said:
I would suggest using HDMI If possible to see if that makes a difference. Are you doing any gaming or are you just, dual monitoring?


Both. Ill try it.
August 2, 2012 10:55:10 PM

Also lets perform a diagnostic test here. Run the 1080p monitor and the troublesome one, change the resultion around on the monitors, see if running them at different resultions makes a difference here. What I am thinking Might be going on here is that running these two displays off of one 4650. I know this is Kind odd, but lets see if that changes any thing
August 2, 2012 11:15:56 PM

chad2625 said:
Also lets perform a diagnostic test here. Run the 1080p monitor and the troublesome one, change the resultion around on the monitors, see if running them at different resultions makes a difference here. What I am thinking Might be going on here is that running these two displays off of one 4650. I know this is Kind odd, but lets see if that changes any thing


Well, I tried to run it at 1280x720p and it worked! Running two monitors on HD4650 didn't work. Now I have to figure out, why I can't run it at 1680x1050.
August 2, 2012 11:21:11 PM

Found out one thing more. Disabling Aero made this problem gone. Max resolution, 60fps.
August 3, 2012 12:28:52 AM

Yeap, problem solved now. I unchecked "enable desktop composition" (disabled aero) and got theme that reminds like my Aero was before. Thanks everyone!
!