Have my VG248QE @144Hz (DVI link) and HDMI out going to Sony Bravia @60Hz with extended desktop. Anytime I play a game it freezes within about 5 seconds and I have to close it. If I try playing a video through Wmp Win 7 just starts completely flaking out and I'm not able to play the video fullscreen on either my monitor or TV. Setting both to 60Hz naturally solves the issue. Will it be possible to keep my monitor @144Hz? TV can't do more than 60hz. I've tried setting the scaling on both displays to GPU but this didn't make a difference (though I'm not sure that it should).
I have a similar dilemma: 144 Hz-capable monitor (new BenQ). HDTV hooked up to that machine as well as another @ 60 Hz. Well -- to be honest -- before installing the new monitor, I had to troubleshoot only getting 60 Hz with it. It had to have a DVI-D connection, and I disconnected the HDTV temporarily. So I -- myself -- am going to find out more specifically what I'm trying to only suggest here.
The other machine is no problem; the new monitor only allows 60 Hz for an HDMI connection, and that's the only option left after connecting the first machine to DVI.
But I had encountered this issue before with a KVM switch and several computers connected to the same monitor. You could switch between one configured at 60 Hz to another @ 75 Hz. Similarly here, I can switch my new monitor from a 120Hz setup to another computer configured at 60Hz.
The refresh rate is specific to the monitor and the computer connected to it. So I can't see why you can't have a monitor @ 120 and the HDTV connected to the same machine @60.
There may be "quirks," but you may be able to live with them. Just as likely -- no quirks whatsoever.
It won't hurt anything to find out, Bro!