GeForce GTX 285 1GB vs Radeon HD 4850 512MB

Intro

Compare all of that to the Radeon HD 4850 512MB, which comes with clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 512MB		110 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 94 Watts (85%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 1GB should in theory be a lot superior to the Radeon HD 4850 512MB in general. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 95424 (150%)

Texel Rate

The GeForce GTX 285 1GB should be quite a bit (approximately 107%) better at AF than the Radeon HD 4850 512MB. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 26840 (107%)

Pixel Rate

The GeForce GTX 285 1GB should be a lot (approximately 107%) faster with regards to FSAA than the Radeon HD 4850 512MB, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
Radeon HD 4850 512MB		10000 Mpixels/sec
	Difference: 10736 (107%)

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 max amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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 - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.