GeForce GTX 480 vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which has core clock speeds of 600 MHz on the GPU, and 500 MHz on the 512 MB of DDR2 RAM. It features 320(64x5) SPUs as well as 32 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTX 480		250 Watts
	Difference: 195 Watts (355%)

Memory Bandwidth

Theoretically, the GeForce GTX 480 should be quite a bit faster than the Radeon HD 4650 512MB in general. (explain)

GeForce GTX 480		177408 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 161408 (1009%)

Texel Rate

The GeForce GTX 480 should be a lot (more or less 119%) better at texture filtering than the Radeon HD 4650 512MB. (explain)

GeForce GTX 480		42000 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 22800 (119%)

Pixel Rate

The GeForce GTX 480 should be quite a bit (approximately 600%) better at anti-aliasing than the Radeon HD 4650 512MB, and will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 28800 (600%)

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 (in units of MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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.