I couldn't stand not knowing anymore, so I just did an assload of input lag testing using flatpanels inputlag test (http://tft.vanity.dk/inputlag.html
). I basically tested the following:
All four HDMI inputs [game mode off] vs. fast PC LCD
All four HDMI unputs [game mode on] vs. fast PC LCD
*No statistical compelling evidence for difference on HDMI ports*
-> HDMI on Laptop LCD vs. fast PC LCD
VGA on Laptop LCD vs. fast PC LCD
and finally a bit of receiver testing:
HDMI through Denon AVR-3311 Receiver [video convert on]: vs. fast PC LCD
HDMI through Denon AVR-3111 Receiver [video convert off] vs. fast PC LCD
(video convert off = receiver sends the video signal through untouched. video convert on alters the signal by placing a graphical overlay that shows up when one go to menu, alters volume etc.)
Here are the results. Feel free to ask any questions if there's something you don't understand: https://spreadsheets.google.com/ccc?...xQ&hl=en#gid=0
The "fast PC LOCD" is a Samsung P2770H 27" LCD. I'm apparently extremely sensitive to input lag and I can't feel ANYTHING on this monitor at all. In my book this is as good as an LCD. I'd guess it's 16 ms max although I don't know.
Summary: input lag in game mode is around 50 ms + the little bit from the Samsung P2770H, so probably around 60+ ms
. Switching HDMI ports had no statistical convincing effect. Game mode makes almost no difference, in my averages it's around 2 ms from ~52 down to ~50! Not statistical certain but the difference is definitely small. VGA looks to be 4-5 ms faster in my laptop tests from ~66½ ms down to 62 ms - again with uncertainties and I cautiously conclude that HDMI is not more laggy than VGA. Although these results strictly only applies to the particular laptop I used, and cannot be sure they will apply to X360, I might save myself the VGA cable, or I may buy it. Not decided on that yet. But I now doubt that it's going to make any difference. At looks to make HDMI fully competitive and it's convenient not necessarily having to consider VGA.
It's hard to say exactly how much lag the Denon AVR-3311 receiver introduces, to be sure I'd have to have more data to reduce uncertainties, but around 2-4 ms without graphical overlay is a fair guess looking at the numbers. Having the graphical overlay on may make this 10-12 ms, again with some uncertainty on the numbers.
Although I am a university physics student and feel compelled to calculate real uncertainties, I'm too tired now and I'm actually too lazy hehe. Anyone else wanna do it is welcome to. All the data's in the spreadsheet.
So that's it for me. Around ~60 ms is too much for me. I've tried to live with it, but I feel it in every game. Even the ones that are theoretically as fast as they can be @ 60 FPS (Geometry Wars 2 and Zuma feels most snappy but it's still there - especially in GW2 is accurate reaction important). If every game was as fast as the fastest, GW2 and Zuma for example, I would have a chance of being able to live with it, but whenever games inherently have more input themself (which include just about any game, Halo ODST/Reach, God of War 3, Stardust HD just to mention a few - and then there's bad cases Motorstorm and Killzone 2!) it comes over the tipping point. The combined effect of the lag inherent in the game code AND the TV input lag makes a palpable impact. To some degree it is ruining the experience for me. Even the few times I've managed to sit down and play not thinking about, I still almost always end up noticing it (or not depending on the genre, but for the most part I do). I'm very sure that there's a large base of people who won't notice (consciously) or care, but it is too much for me.
To be clear it's not so bad that games are totally unplayable or unenjoyable. They are. But it annoys me adequately so, that I now know this is not a keeper for me. I have not decided whether to keep it until I find it's replacement then sell it with whatever loss or to return it while I still can - seller may deduct some value because it's all been opened etc. so it's a tough call. As I've said several times it's a fantastic TV for movies