I have the Acer P223W and I can confirm that it DOES work at triple 1650x1050. I had to choose "Display resolutions that this monitor does not support" in Windows, but it's a rock solid display and I've had no problems with the screen scaling or being the wrong resolution.
Given all the other problems with Acer reported here, I'm rather surprised, so I thought it would be useful to have a positive report for this monitor, at least.
Hi Ereth
There are various P223W models in the market vga only and vga/DVI input.
I have the Acer P223W VGAonly, without DVI input and 1680x1050@57 does not work. Also triple 1680x1050 does not work.
I have tried all the ways proposed in this forum , included creating a new 1680x1050@57hz in nvidia control panel, the result is a blank screen and frequency not supported monitor warning.
Does you Acer P223W has DVI input?
Do you use DVI to DVI or DVI(adapter) to VGA cable on it for the triple configuration?
Regards