GeForce GTX 880M vs Radeon HD 4770

Intro

Compare all that to the Radeon HD 4770, which has core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 880M		130 Watts
	Difference: 50 Watts (63%)

Memory Bandwidth

The GeForce GTX 880M, in theory, should perform quite a bit faster than the Radeon HD 4770 overall. (explain)

GeForce GTX 880M		128000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 76800 (150%)

Texel Rate

The GeForce GTX 880M will be much (more or less 409%) better at texture filtering than the Radeon HD 4770. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 98112 (409%)

Pixel Rate

The GeForce GTX 880M should be much (approximately 154%) better at FSAA than the Radeon HD 4770, and able to handle higher resolutions more effectively. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 18528 (154%)

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 largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, 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 that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.