GeForce GTS 450 vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which comes with a GPU core clock speed of 575 MHz, and 1024 MB of GDDR4 RAM set to run at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
GeForce GTS 450		106 Watts
	Difference: 11 Watts (12%)

Memory Bandwidth

Theoretically, the GeForce GTS 450 should be a little bit faster than the Radeon HD 4830 1GB overall. (explain)

GeForce GTS 450		57728 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 128 (0%)

Texel Rate

The GeForce GTS 450 is much (approximately 36%) faster with regards to AF than the Radeon HD 4830 1GB. (explain)

GeForce GTS 450		25056 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 6656 (36%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTS 450 is superior to the Radeon HD 4830 1GB, by a large margin. (explain)

GeForce GTS 450		12528 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 3328 (36%)

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 (counted in megabytes per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.