5770 resolution puzzle - any suggestions?

[StuPC]

Hi there,
I've just installed a Sapphire 5770 1gb Vapor-X on my Win7 32-bit Dell-made PC, but for some reason it's not allowing me to use my monitor's max resolution of 1680*1050 at 60Hz.
It's sticking at 1440*900, although it will somehow let me go to 1600*1200 (which is useless on my monitor).
If I go into the native screen resolution and List All Modes then 1680*1050 does appear on there but only at 25hz, 29hz and 30hz - all of which are "interlaced"(??) - and none of which work on my PC.

My monitor's always been a little bit wayward (it's made by someone called Iolair, and their support is patchy to say the least!), but with my old 4850 card I could still at least get it displaying at 1680*1050 at 60hz.
I used to have to go into the Screen Resolution menu, click on Advanced Settings, then List All Modes and choose 1680*1050 @60hz from there, but with the hz's now being all messed up I can't do that any more.

Has anyone ever come across anything like this before and - more importantly - did they manage to fix it?

I've got the latest Catalyst drivers installed (12.9) and everything else is running smoothly. Processor is a Q6600

Any help or suggestions would be appreciated!
Thanks,
StuPC

 

[Devrij]

Can you force resolutions in CCC?

 

[rolypolyman]

Hi there,
I've just installed a Sapphire 5770 1gb Vapor-X on my Win7 32-bit Dell-made PC, but for some reason it's not allowing me to use my monitor's max resolution of 1680*1050 at 60Hz.
It's sticking at 1440*900, although it will somehow let me go to 1600*1200 (which is useless on my monitor).
If I go into the native screen resolution and List All Modes then 1680*1050 does appear on there but only at 25hz, 29hz and 30hz - all of which are "interlaced"(??) - and none of which work on my PC.

My monitor's always been a little bit wayward (it's made by someone called Iolair, and their support is patchy to say the least!), but with my old 4850 card I could still at least get it displaying at 1680*1050 at 60hz.
I used to have to go into the Screen Resolution menu, click on Advanced Settings, then List All Modes and choose 1680*1050 @60hz from there, but with the hz's now being all messed up I can't do that any more.

Has anyone ever come across anything like this before and - more importantly - did they manage to fix it?

I've got the latest Catalyst drivers installed (12.9) and everything else is running smoothly. Processor is a Q6600

Any help or suggestions would be appreciated!
Thanks,
StuPC

Don't go into Adapter from advanced settings, go into monitor, screen refresh rate, 60hertz should be there select it, click apply, now go to adapter, list all modes and hopefully your chosen res is there.

 

[rolypolyman]

Any luck op?