GeForce GTX 460 1GB vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which comes with core clock speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
GeForce GTX 460 1GB		160 Watts
	Difference: 105 Watts (191%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 460 1GB should perform much faster than the Radeon HD 4650 1GB overall. (explain)

GeForce GTX 460 1GB		115200 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 92800 (414%)

Texel Rate

The GeForce GTX 460 1GB will be quite a bit (more or less 97%) better at texture filtering than the Radeon HD 4650 1GB. (explain)

GeForce GTX 460 1GB		37800 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 18600 (97%)

Pixel Rate

The GeForce GTX 460 1GB should be quite a bit (approximately 350%) more effective at FSAA than the Radeon HD 4650 1GB, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 460 1GB		21600 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 16800 (350%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.