Just posted this over in the official thread for the 2014 Vizio E-Series, but thought it might be helpful here as well. I ended up with both a Vizio E480i-B2 and Vizio E500i-B1 simultaneously while deciding on a new TV. The E480i-B2 has some documented input lag measurements (around 40ms), but the E500i-B1 unfortunately has not. It has been suspected that the E500i-B1 uses the same/similar panel to that of the E550i-B2 (27ms), but it's never been confirmed best I can tell. Using some reference displays with known input lag results, I believe I've been able to accurately measure the input lag of the E500i-B1.
Vizio E500i-B1 --> Input Lag unknown prior to testing
Vizio E480i-B2 --> Reported/measured input lag of 40ms (Source
LG 32LD450 --> Reported/measured input lag of 16ms (Source 1
, Source 2
Dell 2209WA --> Reported/measured input lag of 2-3ms (Source 1
, Source 2
Each reference display was connected simultaneously to the same graphics card (MSI Nvidia GTX 970) via the same output method (DVI to HDMI cable for the Vizio E480i-B2 and LG 32LD450; straight DVI cable for the Dell 2209WA) as the display being tested (Vizio E500i-B1). The displays were then cloned so that they displayed the same content on both screens. Refresh rate was set to 60Hz across the board.
Once the displays were cloned, the Input Lag Test counter
was then run. While this counter was running, I snapped a photo using a Nikon D3100 in shutter priority mode with a shutter speed of 1/2000. The difference between the two times, based on the known input lag of the reference display, should provide the input lag of the test display. Multiple shots were taken, and measurements were very consistent. I've included representative images in the results section below.
Measured input lag for E500i-B1 with Vizio E480i-B2 (40ms) reference = 20ms
Measured input lag for E500i-B1 with LG 32LD450 (16ms) reference = 16ms
Measured input lag for E500i-B1 with Dell 2209WA (3ms) reference = 33ms
NOTE: The Dell 2209WA has a native resolution of 1680 x 1050, forcing the E500i-B1 to have to scale the image. This almost certainly introduced additional lag into the test. I'd argue this is the least reliable result of the three tested and only include it for the sake of having an additional data point.
Based on these observed measurements, I'd suggest that the E500i-B1 has an input lag of approximately 16-20ms. I think it's clear that the E500i-B1 performs very
well with regards to input lag. The LG 32LD450 was one of the best performing HDTV's on the market with regards to input lag for quite a while (which coincidentally I ended up with entirely by accident), and the E500i-B1 appears to match it exactly. The E55
0i-B2 measures in at 27ms based on CNET's testing. I'm assuming they used the Leo Bodnar Input Lag tester (which always measures a little higher than the picture method), which suggests to me that its very likely that the 50" model uses a panel similar to that of the 55" model.