Input-Lag
As well as the response time, the oft-mentioned input lag is also important for a monitor's suitability for gaming. If too much time passes between input and optical response, the fraction of hardcore games in particular will find the controls too indirect.
The Dell 2408WFP's performance in a stopwatch tests against a CRT model is just mediocre. On average, we measured a value of 32 ms. In 10 percent of all cases, the deviation was a maximum of 15 ms and in another 15 percent, it was a maximum of 46 ms. In 80 percent of cases, the deviation was 32 ms, which is the average value.
Although the average value is often significant, we can establish that the lag is usually 32 ms (or 2 frames per second) and that the maximum is just over 3 frames per second (46 ms).
Left: Dell 2408WFP with minimum input lag. Right: CRT as reference.
Left: Dell 2408WFP with average input lag. Right: CRT as reference.
Left: Dell 2408WFP with maximum input lag. Right: CRT as reference.
The result should be sufficient for occasional gamers, but the input lag is too high for those who play often and for professional gamers.
The A01 revision of the Dell 2408WFP was intended to improve the input lag. This was measured at up to 60 ms on the previous model. Although a reduction has been achieved, the result is still no more than satisfactory for real gamers.
http://www.prad.de/en/monitore/review/2009/review-dell-2408wfp-part14.html#Lag
Its still 2 frames, and that's still pretty bad...