1440p on T400?

[Nadav Erez]

I own a Thinkpad T400 with Intel 4500MHD / Mobility Radeon 3470 graphics. The specs for both GPUs state that they support 2560x1440, but the T400 only has a VGA port. I've found conflicting information on this subject, as VGA officially supports up to 2048x1536 @85 Hz, but some people have managed to use it @2560x1440 with a VGA to DVI converter. Is this possible?

 

[hang-the-9]

It may be possible to do it with a lower refresh rate. The bandwidth of the connection is resolution with the refresh rate.

Failing that, the docking station for the T400 will be very cheap to find used and that has a DVI port, and may even have a DP port although my memory on those may be off.

 

[Nadav Erez]

It may be possible to do it with a lower refresh rate. The bandwidth of the connection is resolution with the refresh rate.

Failing that, the docking station for the T400 will be very cheap to find used and that has a DVI port, and may even have a DP port although my memory on those may be off.

Thanks! Is there any equation or way to calculate the bandwidth? I was thinking of something like this:
(2048x1536, 85 Hz) Bandwidth = (2560x1440, X Hz) Bandwidth

Update: I remember reading somewhere that VGA (D-Sub) supports up to ~400 MHz of bandwidth. Using a handy video bandwidth calculator, I inputted 2048x1536, 85Hz and the bandwidth was ~401MHz. 2560x1440, 60Hz was ~332MHz. Does that mean a VGA cable without an adapter will be okay?

 

[hang-the-9]

It may be possible to do it with a lower refresh rate. The bandwidth of the connection is resolution with the refresh rate.

Failing that, the docking station for the T400 will be very cheap to find used and that has a DVI port, and may even have a DP port although my memory on those may be off.

Thanks! Is there any equation or way to calculate the bandwidth? I was thinking of something like this:
(2048x1536, 85 Hz) Bandwidth = (2560x1440, X Hz) Bandwidth

Update: I remember reading somewhere that VGA (D-Sub) supports up to ~400 MHz of bandwidth. Using a handy video bandwidth calculator, I inputted 2048x1536, 85Hz and the bandwidth was ~401MHz. 2560x1440, 60Hz was ~332MHz. Does that mean a VGA cable without an adapter will be okay?

Don't know, it may work at a lower refresh rate. I don't have any high res monitors to try with although I have a ton of different T models to work with.