GeForce GTX 285 1GB vs Radeon HD 5830

Intro

Compare those specs to the Radeon HD 5830, which comes with GPU core speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is comprised of 1120(224x5) SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5830		175 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 29 Watts (17%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB will be 24% faster than the Radeon HD 5830 overall, because of its higher data rate. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 5830		128000 MB/sec
	Difference: 30976 (24%)

Texel Rate

The GeForce GTX 285 1GB will be a bit (approximately 16%) better at anisotropic filtering than the Radeon HD 5830. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
Radeon HD 5830		44800 Mtexels/sec
	Difference: 7040 (16%)

Pixel Rate

The GeForce GTX 285 1GB should be much (about 62%) more effective at AA than the Radeon HD 5830, and able to handle higher resolutions better. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
Radeon HD 5830		12800 Mpixels/sec
	Difference: 7936 (62%)

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 (in units of MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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 get to the max fill rate.