GeForce GTX 460 (OEM) vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which has core speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 460 (OEM)		150 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 40 Watts (27%)

Memory Bandwidth

Theoretically, the Radeon HD 4890 2GB should perform a little bit faster than the GeForce GTX 460 (OEM) overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GTX 460 (OEM)		108800 MB/sec
	Difference: 16000 (15%)

Texel Rate

The Radeon HD 4890 2GB is a bit (more or less 10%) faster with regards to anisotropic filtering than the GeForce GTX 460 (OEM). (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce GTX 460 (OEM)		36400 Mtexels/sec
	Difference: 3600 (10%)

Pixel Rate

The GeForce GTX 460 (OEM) will be a lot (more or less 30%) more effective at FSAA than the Radeon HD 4890 2GB, and also should be able to handle higher screen resolutions better. (explain)

GeForce GTX 460 (OEM)		20800 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 4800 (30%)

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 maximum amount of information (measured in MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can 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 colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.