My PS timming is for the Radeon only. The GeForce value be a bit off I don't know. Also make sure you use the latest PS version because the recent Nvidia changed the way of custom resolution so old version PowerStrip don't work.
Btw, just disable Windows PnP monitor config and manually select the Sony W900 as your monitor. Then you should have all the resolution you want with the correct display driver and Powerstrip support.
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