GeForce GTX 460 vs Radeon HD 4650 512MB

Intro

Compare those specs to the Radeon HD 4650 512MB, which uses a 55 nm design. AMD has set the core frequency at 600 MHz. The DDR2 memory is set to run at a frequency of 500 MHz on this particular card. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTX 460		150 Watts
	Difference: 95 Watts (173%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 460 should in theory be a lot better than the Radeon HD 4650 512MB overall. (explain)

GeForce GTX 460		86400 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 70400 (440%)

Texel Rate

The GeForce GTX 460 is much (more or less 97%) faster with regards to AF than the Radeon HD 4650 512MB. (explain)

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

Pixel Rate

The GeForce GTX 460 will be much (approximately 238%) better at anti-aliasing than the Radeon HD 4650 512MB, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 460		16200 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 11400 (238%)

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 largest amount of information (in units of MB per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.