Yes, DyAc is BenQ's brand name for their blur reduction (like ASUS's ELMB and NVIDIA's ULMB)
Yes, it has much better-optimized Blur Reduction (reportedly brighter too, than the "non-DyAc" ones).
Although on by default, you can still turn it on/off though, depending on whenever you need it.
BenQ Zowie XL2540 -- you can turn on blur reduction (not named DyAc), but it has to be via service menu, and it's not as bright.
BenQ Zowie XL2546 -- it comes with official blur reduction (DyAc), on by default, was found to be brighter, but it can also be turned off too.
240Hz is definitely a real upgrade from 144Hz if you really clearly noticed the 60->120Hz jump. The 120->240 jump won't be as big, but it's definitely noticeable and real when you can run very high framerates (>200fps), and your refresh-rate-granularity-related "lag jittering" / "lag range variance" will roughly halve (min/max/avg lag will be much more stable) thanks to more frequent refresh cycle intervals. Lag jittering (min/max/avg) improvements is especially very dramatic when you
compare 60Hz versus 240Hz. This is truly yet another reason to get 240Hz instead of 144Hz.
Most sites and reviewers don't realize that aiming accuracy is affected by
lag randomness (min lag/max lag being very different), which is another error factor other than absolute lag! It even occurs during apples-vs-apples comparisions (1000fps-vs-1000fps VSYNC OFF comparisions at multiple different refresh rates). This is a measurement to "first screen reaction" (full frame high speed camera), rather than "center screen reaction" (Leo Bodnar lag tester style) -- this is important since competitive players use peripheral vision to react to other parts of the screen.
At 1000fps @ 60Hz, your min/max is 14/27 (
a 13ms random-lag range!). But at 1000fps @ 240Hz, your min/max is 12/16 (
a 4ms random-lag range!).
At
any VSYNC OFF at
any frame rate, lag "randomization" error margin, caused by refresh rate limitation, is up to one full refresh cycle. That improves aiming quite a lot when the
refresh-rate-granularity-related forced lag jitterring (lag randomness) is reduced by sheer insanity in refresh rates.
Absolute lag is important. But lag consistency is important. High-Hz improves lag consistency. Many other mainstream sites do not understand this. But we do.
Manufacturers, bring on the 480Hz and 1000Hz monitors!
