The 645 GT3e was released on 01 Jun 2019
Intel PC game performance check 645 GT3e
Shader Processing Units
645 GT3e Game Requirement Analysis
Intel Iris Plus Graphics 645 GT3e are integrated graphics in some of Intel's Kaby Lake mobile processors. It can be found in Intel Core i5-8257U and the Intel Core i5-8557U
The Kaby Lake architecture succeeds the Skylake architecture and aims for increased CPU and graphics performance, via the same power requirements. It includes support for DirectX 12.1, OpenCL 2.1 and OpenGL 4.6.
The central unit initially runs at 300MHz and goes up to 1150MHz, in turbo mode in the Intel Core i5-8557U.
Because Performance depends heavily on the Memory Bandwidth, it may vary heavily from System to System.
Best case scenario, expect performance identical to a dedicated AMd HD 6790.