GeForce GTX 285 1GB vs Radeon HD 7870

Intro

Compare those specs to the Radeon HD 7870, which has core speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870		175 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 29 Watts (17%)

Memory Bandwidth

Theoretically, the GeForce GTX 285 1GB should be a little bit faster than the Radeon HD 7870 overall. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 7870		153600 MB/sec
	Difference: 5376 (4%)

Texel Rate

The Radeon HD 7870 will be quite a bit (approximately 54%) better at AF than the GeForce GTX 285 1GB. (explain)

Radeon HD 7870		80000 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 28160 (54%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 is a better choice, and very much so. (explain)

Radeon HD 7870		32000 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 11264 (54%)

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 (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.