GeForce GTX 460 1GB vs Radeon HD 4830 512MB

Intro

Compare those specs to the Radeon HD 4830 512MB, which features core speeds of 575 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
GeForce GTX 460 1GB		160 Watts
	Difference: 65 Watts (68%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 460 1GB is 100% faster than the Radeon HD 4830 512MB in general, because of its higher data rate. (explain)

GeForce GTX 460 1GB		115200 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 57600 (100%)

Texel Rate

The GeForce GTX 460 1GB should be quite a bit (about 105%) more effective at texture filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 460 1GB		37800 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 19400 (105%)

Pixel Rate

The GeForce GTX 460 1GB will be quite a bit (approximately 135%) better at full screen anti-aliasing than the Radeon HD 4830 512MB, and capable of handling higher resolutions more effectively. (explain)

GeForce GTX 460 1GB		21600 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 12400 (135%)

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 data (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.