GeForce GTX 460 2GB vs Radeon HD 4650 512MB

Intro

Compare those specifications to the Radeon HD 4650 512MB, which comes with GPU clock speed of 600 MHz, and 512 MB of DDR2 RAM set to run at 500 MHz through a 128-bit bus. It also features 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTX 460 2GB		160 Watts
	Difference: 105 Watts (191%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 460 2GB should perform much faster than the Radeon HD 4650 512MB overall. (explain)

GeForce GTX 460 2GB		115200 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 99200 (620%)

Texel Rate

The GeForce GTX 460 2GB should be a lot (more or less 97%) better at AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 460 2GB		37800 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 18600 (97%)

Pixel Rate

The GeForce GTX 460 2GB will be a lot (approximately 350%) more effective at FSAA than the Radeon HD 4650 512MB, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 460 2GB		21600 Mpixels/sec
Radeon HD 4650 512MB		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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.