VisionTek Radeon HD 5450 512MB vs HD 5450 SFF 1GB

Pixel fillrate number shows how many pixels a card can draw on screen and off screen. The higher this number, the higher maximum display resolution and frame rate the GPU can support. The maximum theoretical pixel fillrate is defined as the number of ROPs, multiplied by graphics frequency. Since both characteristics are equal between cards, their pixel fillrate is also identical.

There are two factors that influence the maximum theoretical texture fillrate. They are the number of TMUs (Texture Mapping Units) and graphics frequency. Because both models have the same number of TMUs and the same graphics clock rate, their texture fillrate is equal.

Single Precision performance indicates how fast the graphics card is at running applications, that process mainly single-precision floating point data. The performance is expressed in GFLOPS or billions of Floating Point Operations Per Second. Since FP calculations are performed by shaders, stream processors or CUDA cores, the performance is directly proportional to their number. It also depends on the processor clock rate. These two GPUs have the same single-precision performance.

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 screen resolutions, use larger and more detailed textures, and apply more complex 3D effects and filters. The VisionTek Radeon HD 5450 SFF 1GB offers insignificantly higher memory bandwidth.