Input lag and pixel response are different things... While pixel response is fix (depending on panel),
input lag on LCD usually have a varied range (for example, 0 to 20 ms or more, an average is quoted after certain number of frame captures) and depends on the electronics chips/processing on...
The pro. HP DreamColor LP2480zx has tri-colour RGB LEDs (so are high-end Bravia TVs). Not sure... but it may also be edge-lit too..
The white LEDs could be more inferior to wide-gamut CCFL (initially). However, LEDs last longer, would have relatively the same brightness/same wavelength over the...
For true 120Hz refresh rate, currently only TN panels are fast enough (B2W2B needs to be below 8ms). With G2G at 2ms and B2W2B at around 5ms. The best IPS or PVA are rated at around 5ms G2G now, with B2W2B exceeding 10ms, is not sufficiently fast enough to truly display images at 120Hz.
With...
You could switch display outputs...run VGA to the monitor and DVI/HDMI on the TV..
If not you might want to try for the reduced blanking on 1080p VGA signal to the TV
It was confirmed by a products manager of ATI/AMD ..... "SixEdition" (as of now/planed/being developed) will only have 2 DP+ (mini-DPs), The other 4 will be pure DP.
overheating?... first time seeing this phenomena ... seen cases of liquid crystals leaking/fungal growth on the liquid within the panel (both which is not the cause here)
32" 1080p?, does not matter really... a 1.5m (5') cable for USD 4 or less will do (or longer it you need so). Digital is digital, either you get signals (picture) or you don't. It does not matter you use copper/gold/silver/platinum/super conductor/with ferite cores/plumblum/carbon/graphite in...
different pixel pitch...Besides all have to be the same res. for Eyefinity...
Extended desktop will not be a problem though (since like for a decade or so ago)
TN panels at 1920x1200 are rare... Ones (TN, 1200p) with DP port even rarer (or not available yet).. If you want to by-pass getting an active DP to DVI converter, get at least one monitor with DP input.
you're missing a few (3) decimal points... 3x 1080p has 6,220,800 pixels... or 6221 k pixels. 5870 should handle 3x1080p just fine (you'll have the option of crossfire should the need arise)