Forcing a 75hz resolution

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mikeybabs

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Jul 24, 2012
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Hi everyone, I'm doing eyefinity with a radeon 6950 and trying to get battlefield 3 to look as good as possible (only a single 6950 so I know i'm limited)...

basically it runs the game fine on ultra on a single screen, but with triple monitors it struggles a bit. however I've found a nice work around: to lower the eyefinity resolution to 2400x600, which lets me play it very smooth on ultra, and with a very nice benefit on top of that, it unlocks a 75hz refresh rate, making the game play even more smooth... right now my preference is to play at that lower resolution with 75hz opposed to playing at 5760x1080 on low...

the biggest problem though is that the resolution is warped, the wrong aspect ratio, so things look a bit stretched... is there anyway i can unlock a true eyefinity resolution that supports 75hz and not have it stretched?

the supported resolutions of my monitor @ 75hz are all 4:3

here's a link to my monitor:

http://www.newegg.com/Product/Product.aspx?Item=N82E16824236052

thanks guys! :)
 
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RussK1

RussK1

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Apr 15, 2011
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You also could run at your native resolution and turn off MSAA and just use post process AA, no motion blur and turn off HBAO and go with SSAO and the native refresh may become more of a non-issue.

You can start here to see what can be expected as far as FPS. Note: these benchmarks were done on campaign; MP will be much more CPU demanding.

http://www.tomshardware.com/reviews/battlefield-3-graphics-performance,3063-8.html
 
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mikeybabs

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i've experimented a lot with my setup and at 5760x1080 the only smooth playable setting is on low, and it looks crappy, so i'm pretty sure i need to crossfire to get reasonable framerates at my native eyefinity resolution...

i'm perfectly happy with 2400x600 as my monitors give a natural pixel blending AA affect and the 75hz is very nice...

i cannot find where to force 75hz in catalyst, whenever i pick 75hz it automatically goes to a resolution that supports it...

i read that some people were able to unlock 75hz at 1080p with my monitor over HDMI but i havnt had any luck with that either...
 
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mikeybabs

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i'm using it right now, trying to figure out how to set the custom resolution and refresh rate :) i'll select your answer as the best one as long as i get it working! any tips would be appreciated
 
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mikeybabs

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I'd like to be able to enable 1920x480 to span across all 3 monitors in eyefinity, since each monitor shares the common 640x480 support... i dont see any options in CCC and powerstrip doesnt seem to be letting me access anything :(
 
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mikeybabs

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hi dingo, that version of powerstrip unlocked the options but i still havnt had luck, im beginning to think that if my monitor doesnt support 75hz at a certain resolution its impossible to force it? thanks russk for the thread, i guess im not alone in this search to get 75hz... appreciate all the replies on BF3 optimization, i'm less concerned about that because I know how to get good frame rates on my particular setup, it's just a matter of trying to get 75hz at certain resolutions... since my monitor supports 640x480 75hz i'm curious if i can do eyefinity at 1920x480 which would be less stress than 1080p and it'd be on all 3 monitors very smoothly at 75hz
 
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mikeybabs

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also im using 1 DVI to DVI, an HDMI to DVI, and a displayport to DVI adapter... with this configuration do you think i'm limited to certain resolutions? it seems in the past i had more flexibility with which eyefinity resolutions i could choose... i don't know if its a driver or connectivity issue
 
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dingo07

dingo07

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The good thing about Powerstrip is you will KNOW if your monitor supports the options by switching to them, but you could potentially damage the device in the process. So if you set the settings to 75Hz @1920x480 and you get anything but a stable picture, chances are some tweaking of the Freq isn't going to help, but feel free to try!

You could also search the internet for profiles that have been created for your monitor, perhaps someone has done it already and created them.
 
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RussK1

RussK1

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ede98e37_dvi_connector_types.gif


Single-link DVI supports resolutions up to 1920x1200 @ 60hz although lowering the resolution to 1680x1050 should get you 75hz which would take slightly less bandwidth.

Same with HDMI (1.4a will fix this I believe)

DisplayPort supports 2560x1600 @ 60hz

Dual-link DVI supports 2560x1600 @60hz

Good read Wiki here.

Capture-38.png



 
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mikeybabs

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Thanks Russ, however using 1680x1050 is 16:10 and not 16:9 aspect ratio, which my monitor is 16:9...

I just don't understand why there are no 16:9 resolutions that support 75hz on this monitor, and why they are all 4:3?

my video card has a 1.4a hdmi output on it, if I feed that into one of my monitors, will it help?

The best i've been able to do is go into eyefinity and do 2400x600 @75hz... very pleasing, but would be even more pleasing if it was the correct aspect ratio (since it's essentially 800x600 on each of the three 16:9 monitors)... it's not as bothersome as you might think, but i would love to unlock a better resolution somehow, and if i choose a low enough resolution that's close to 1080p, my single 6950 GPU could handle anything maxed out with very good frames per second :)
 
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mikeybabs

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Also, when I go into advanced settings in my display options and "List Modes"... 75hz is not supported by my monitor @ 1680x1050 :(
 
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RussK1

RussK1

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Try disabling Eyefinity and either use just the DisplayPort or DP -to- HDMI and see what options you have with a single display.

Also 1440x900...

Read HERE.

The ASUS VH242H only supports a 75 Hz Vertical refresh rate at resolutions of 640x480, 800x600, 1024x768, 1280x720, 1280x768, 1280x800, 1280x1024 and 1440x900.

Resolutions 1680x1050 and 1920x1080 are supported at 60 Hz only.

I haven't seen anywhere in ASUS' published specifications where they claim that the VH242H will run at 1920x1080 with a 75 Hz Vertical refresh rate.

All this information is published in the ASUS VH242/VH222 Series LCD Monitor User Guide if you care to read it.
Click to expand...
 
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AndGet

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Dec 22, 2013
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I just solved this problem.
I have a new monitor Benq with 75 Hz 1680*1050.
And at first I tried a native DVI-D cable - and it was maximum 75 Hz with 1280*760
But I wanted 1680*1050 with 75 Hz.
I take native VGA cable, and at first ATI Catalyst didnt show this option ( I tried different options)
And after I used Win7 monitor setup - and there appeared option 75 Hz with 1680*1050.
 
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