HD6950 + SM2233RZ = only 60Hz

just Scott · 2 Jul 2011 at 03:04

So my friend bought these 2 things and was hoping to get 120Hz for games and such, but he can't figure out how to actually use 120Hz. In Windows (Windows 7) the only option is 60Hz in the display properties. He's tried installing the monitor drivers from the disc and from the Samsung website, and the video card drivers are up to date. It's an Asus HD6950 1GB.

We've googled around for solutions but can't really find any. One mentioned using the dual link DVI port instead of the single link, but that doesn't make a difference.

Does anyone have any ideas?

Cheers

Amnesia · 2 Jul 2011 at 03:13

H2F Scott said:
One mentioned using the dual link DVI port instead of the single link,

you mean cable ?
the monitor should have came with the correct cable.

was there not a problem with the ati 5 series cards and 2d refresh rates ? not sure if they sorted it with the 6 series.

just Scott · 2 Jul 2011 at 03:30

Amnesia said:
you mean cable ?
the monitor should have came with the correct cable.

was there not a problem with the ati 5 series cards and 2d refresh rates ? not sure if they sorted it with the 6 series.

Nah, the video card has a single link and dual link DVI port. According to a review I read anyway.

just Scott · 2 Jul 2011 at 20:06

Any ideas?

Rroff · 2 Jul 2011 at 20:21

Sometimes on AMD cards you need to apply a registry edit to get 120Hz - someone else might have the details readily to hand, I don't have them noted down here.

AMD and 120Hz is a bit hit and miss tho, even with the registry edit you may find you get flickering (sometimes solved by manually forcing certain clocks/disabling power mangament options) and/or tearing or stuttering in games... seems about 50/50 if it works or not and some people never get it working quite right.

Surveyor · 2 Jul 2011 at 20:28

Make sure you are using a dual link cable.

opethdisciple · 2 Jul 2011 at 20:29

Have you tried to set the refresh rate on the actual monitor itself?

Change it to 120mhz, then windows will be able to change its self to 120mhz too..

Rroff · 2 Jul 2011 at 20:29

Ooops thought for some reason he'd already eliminated the cable.

opethdisciple · 2 Jul 2011 at 20:30

Surveyor said:
Make sure you are using a dual link cable.

Which out of these is the highest quality?

just Scott · 2 Jul 2011 at 20:35

edit: double post sorry

just Scott · 2 Jul 2011 at 20:36

Rroff said:
Sometimes on AMD cards you need to apply a registry edit to get 120Hz - someone else might have the details readily to hand, I don't have them noted down here.

AMD and 120Hz is a bit hit and miss tho, even with the registry edit you may find you get flickering (sometimes solved by manually forcing certain clocks/disabling power mangament options) and/or tearing or stuttering in games... seems about 50/50 if it works or not and some people never get it working quite right.

Can you name a video card that definitely works with 120Hz? He's willing to change card if it means getting 120Hz working. Preferably around the same performance as the HD 6950.

Surveyor said:
Make sure you are using a dual link cable.

He's using a DVI-D dual link cable. It came with the monitor, so it should be the correct one.

opethdisciple said:
Have you tried to set the refresh rate on the actual monitor itself?

Change it to 120mhz, then windows will be able to change its self to 120mhz too..

He's looked through the monitor onboard settings and there is no option to change the refresh rate there.

Thanks guys

Surveyor · 2 Jul 2011 at 20:38

The monitor had a dual link DVI-D input so you should be using a cable with these pins:

Edit

Beaten to it.

just Scott · 2 Jul 2011 at 20:39

Surveyor said:
The monitor had a dual link DVI-D input so you should be using a cable with these pins:

Yeah, that's the one he's using.

Rroff · 2 Jul 2011 at 20:39

There is no option on the monitor to change refresh rate - not sure if thats what opethdisciple meant or if he meant to go into the display control panel and change refresh rate for the monitor there.

I'll try and find the registry changes needed but my google has failed me right now and I don't have a copy of it at home.

If hes serious about using 120Hz then he'd be better off getting an nVidia card such as a 470, 480, 570, etc.

Surveyor · 2 Jul 2011 at 20:41

Have you installed the monitor drivers so that Windows and the GPU can recognise it as a 120Hz monitor?

just Scott · 2 Jul 2011 at 20:41

Rroff said:
There is no option on the monitor to change refresh rate - not sure if thats what opethdisciple meant or if he meant to go into the display control panel and change refresh rate for the monitor there.

I'll try and find the registry changes needed but my google has failed me right now and I don't have a copy of it at home.

Same, I couldn't find anything through google. And yeah, we've tried setting it in the Windows display properties and in CCC. The max he can choose is 60Hz in both.

Surveyor said:
Have you installed the monitor drivers so that Windows and the GPU can recognise it as a 120Hz monitor?

The monitor drivers are installed yes.

Rroff · 2 Jul 2011 at 20:46

See if this is useful:

http://www.tomshardware.co.uk/forum/289441-15-hd5xxx-series-video-cards-support-120hz

opethdisciple · 2 Jul 2011 at 20:48

I think, its most likley to do with how the gpu is connected to the monitor.

just Scott · 2 Jul 2011 at 20:54

Rroff said:
See if this is useful:

http://www.tomshardware.co.uk/forum/289441-15-hd5xxx-series-video-cards-support-120hz

Thanks, he's trying the solution turnipfarmer posted now.

opethdisciple said:
I think, its most likley to do with how the gpu is connected to the monitor.

Surely there's only 1 way to connect it?

Surveyor · 2 Jul 2011 at 20:56

Only one of the DVI outputs on the 6950 is dual link.

Try changing the one you're using.