When we first tested the 34UC79G it showed an odd behaviour. As you increased the refresh rate the overdrive impulse actually seemed to be turned DOWN. This meant that response times slowed down and although that did help reduce some of the overshoot, it meant that the screen was not usable in any of the high refresh rates really at all. You got noticeable smearing and blurring on moving content, even with the maximum 'fast' overdrive mode being used. We felt that 100Hz was about the maximum refresh rate you could use, and you had to stick with the 'fast' mode to make that viable. Any refresh rate above that showed too much blurring and was not enjoyable.

Firmware Fix

LG investigated the issue for us after we provided detailed measurements and tests and sent us an updated firmware to try. This required a hardware device to flash the screen, but we were pleased that it seemed to help. The tests in the following section are using this V2 firmware. If you have already bought the screen then you will have a V1 firmware which will likely show high levels of blurring and smearing when gaming at high refresh rates. LG have confirmed that users will be able to contact their country's LG service and support team to arrange to send the screen back for an update in the near future, once internal testing has been completed. It will not be possible for users to update the firmware themselves. The new firmware is still being internally tested, but once that has been completed the LG service teams will be able to help.