NVIDIA GeForce 605 1 GB (OEM) vs GT 620

There are two factors that affect the maximum pixel fillrate. These are the number of ROPs (Raster Operations Pipelines) and graphics frequency. The NVIDIA GeForce GT 620 has an edge here, as it runs at higher rate, and both GPUs have the same number of ROPs. Better maximum pixel fill rate allows more pixels to be drawn on screen per second, which results in increased card performance, unless the GPU is limited by something else, such as memory bandwidth or texture mapping.

The NVIDIA GeForce GT 620 has twice as many TMUs than the GeForce 605 1 GB (OEM) graphics card. Additionally, its graphics frequency is higher, therefore its texture fillrate is significantly higher. Better maximum texture fill rate means that the graphics card can utilize more sophisticated 3D effects and/or map more textures to each textured picture element, which improves games visual appearance.

Maximum Single Precision performance, measured in GFLOPS or billions of Floating Point Operations Per Second, illustrates how good the GPU is at executing applications, that process primarily single-precision floating point data. All single-precision calculations are performed by stream processors or CUDA cores, thus the more cores / processors the graphics card has the better. Performance also depends on the processor clock speed. The NVIDIA GeForce GT 620 is substantially faster here. Higher single-precision performance number means the graphics card will perform better in general computing applications. Since CUDA cores or stream processors are also used as vertex and geometry shaders for 3D image generation, higher performance is also beneficial to games.

To speed up processing, the graphics cards store 3D scene data, textures and intermediate data, used for image generation, in on-board memory. The video memory usually has much higher bandwidth than system RAM, and more bandwidth allows the GPU to run at higher display resolutions, use larger and more detailed textures, and apply more complex 3D effects and filters. The bandwidth is dependent on several components, such as memory type, speed, and memory interface width. Specifically, the NVIDIA GeForce GT 620 offers higher memory clock. Consequently, it has a bit higher memory bandwidth.