GeForce GTX 285 1GB vs Radeon HD 7850

Intro

Compare those specs to the Radeon HD 7850, which has a clock speed of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is made up of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850		130 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 74 Watts (57%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB is 4% quicker than the Radeon HD 7850 overall, because of its greater data rate. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 5376 (4%)

Texel Rate

The Radeon HD 7850 will be a little bit (about 6%) better at AF than the GeForce GTX 285 1GB. (explain)

Radeon HD 7850		55040 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 3200 (6%)

Pixel Rate

The Radeon HD 7850 will be a lot (more or less 33%) more effective at FSAA than the GeForce GTX 285 1GB, and will be able to handle higher screen resolutions better. (explain)

Radeon HD 7850		27520 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 6784 (33%)

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 data (counted in megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one 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 the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.