GeForce GTX 460 vs Radeon HD 4650 512MB

Intro

Compare that to the Radeon HD 4650 512MB, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The DDR2 RAM is set to run at a frequency of 500 MHz on this specific model. It features 320(64x5) SPUs along with 32 TAUs 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 theoretically be quite a bit superior to the Radeon HD 4650 512MB in general. (explain)

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

Texel Rate

The GeForce GTX 460 will be quite a bit (approximately 97%) faster with regards to anisotropic filtering 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 is quite a bit (approximately 238%) more effective at anti-aliasing than the Radeon HD 4650 512MB, and also will be capable of handling higher screen resolutions more effectively. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 - the lower the bandwidth is, the lower the ability to reach the max fill rate.