GeForce GTX 460 1GB vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which comes with GPU clock speed of 600 MHz, and 512 MB of DDR2 memory running at 500 MHz through a 128-bit bus. It also is made up of 320(64x5) SPUs, 32 Texture Address Units, 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 1GB		160 Watts
	Difference: 105 Watts (191%)

Memory Bandwidth

Theoretically, the GeForce GTX 460 1GB should be a lot faster than the Radeon HD 4650 512MB in general. (explain)

GeForce GTX 460 1GB		115200 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 99200 (620%)

Texel Rate

The GeForce GTX 460 1GB should be a lot (approximately 97%) better at AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 460 1GB		37800 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 18600 (97%)

Pixel Rate

The GeForce GTX 460 1GB will be a lot (about 350%) more effective at full screen anti-aliasing than the Radeon HD 4650 512MB, and also should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 460 1GB		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: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.