The main difference between the 7GS75Q-B.AEU and the 27GS75QX-B lies in the refresh rate and certain features. The 27GS75QX-B offers a refresh rate of 180 Hz (with the option of overclocking to 200 Hz), while the 7GS75Q-B.AEU is generally associated with a refresh rate of 165 Hz. The 27GS75QX-B also incorporates a USB hub, which is not mentioned for the 7GS75Q-B.AEU. Both have QHD resolution (2560 x 1440 pixels) and an IPS panel, but the 27GS75QX-B is more geared towards competitive gaming with a 1ms response time and NVIDIA G-SYNC and AMD FreeSync compatibility, as well as HDR10 and 99% sRGB coverage.