GeForce GTX 465 vs Radeon HD 4830 512MB

Intro

Compare all of that to the Radeon HD 4830 512MB, which uses a 55 nm design. AMD has set the core frequency at 575 MHz. The GDDR3 memory runs at a speed of 900 MHz on this model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
GeForce GTX 465		200 Watts
	Difference: 105 Watts (111%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 465 will be 78% faster than the Radeon HD 4830 512MB overall, because of its greater bandwidth. (explain)

GeForce GTX 465		102592 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 44992 (78%)

Texel Rate

The GeForce GTX 465 is much (about 45%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 465		26708 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 8308 (45%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 465 is the winner, by far. (explain)

GeForce GTX 465		19424 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 10224 (111%)

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 data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.