GeForce GTS 450 1GB vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which has core clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 memory. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator 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 1GB		106 Watts
	Difference: 11 Watts (12%)

Memory Bandwidth

In theory, the GeForce GTS 450 1GB should be 0% quicker than the Radeon HD 4830 1GB overall, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce GTS 450 1GB will be a lot (more or less 36%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTS 450 1GB is superior to the Radeon HD 4830 1GB, by a large margin. (explain)

GeForce GTS 450 1GB		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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one 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 calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.