Radeon HD 7400G Game Requirement Analysis
Radeon HD 7400G is an integrated GPU on the entry-level ULV Trinity CPUs.
It's based on the 32nm Terascale 3 architecture and offers 192 Shader Processing Units, 12 TMUs and 4 ROPs. The memory interface will depend on whether or not the laptop's system RAM is dual channelled (128-bit if so, 64-bit, if not) and the operating memory clock can be up to 667MHz (max speed supported by the CPU). The central unit runs at 327MHz and will go up to 424MHz in Turbo Mode. Expect a TDP of up to 17 Watt.
Its performance is below Intel HD 4000 Graphics but is slightly above next in series - Radeon HD 7420G, despite the naming, due to the extra Shaders which prove useful in most of today's modern games.
Most of today's modern games will have to be played at the lowest settings, while extremely demanding games (e.g. Crysis 3) are most likely unplayable.