Question

Nvidia Geforce GT 645M独立显卡和GT640M的有什么差别

Answer 1

两种都是英伟达普通性能独显，属于入门级产品里的中端性能，其性能也就比英特最新核显hd630之类强一分，
gt640m/645m之间差距并不大，可以说很少，645m强5％左右。

Answer 2

似乎是改进型号的640M，主频为710MHz，但实际表现还不如640M，又一个换马甲忽悠人的物件。
GeForce GT 645M + Compare Average G3D Mark
Description: Bus Interface: PCIe 3.0 x16, Max Memory Size: 2048 MB, Core Clock(s): 710 MHz, Graphics API Support: DirectX 11 OpenGL 4.5 Max TDP: 32 W
Videocard Category: Mobile
Videocard First Benchmarked: 2013-01-25
G3DMark/\$Price: NA Overall Rank: 439
性能测试得分849

GeForce GT 640M + Compare Average G3D Mark
Description: Bus Interface: PCIe 3.0 x16, Max Memory Size: 2048 MB, Core Clock(s): 625 MHz, Graphics API Support: DirectX 11 OpenGL 4.5 Max TDP: 32 W
Videocard Category: Mobile
Videocard First Benchmarked: 2012-10-13
G3DMark/\$Price: NA Overall Rank: 413
性能测试得分914