GeForce GTX 880M vs Radeon HD 4890 2GB

Intro

Compare those specifications to the Radeon HD 4890 2GB, which has a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM set to run at 975 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M		130 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 60 Watts (46%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 880M should be 3% quicker than the Radeon HD 4890 2GB in general, due to its greater bandwidth. (explain)

GeForce GTX 880M		128000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 3200 (3%)

Texel Rate

The GeForce GTX 880M should be quite a bit (more or less 205%) better at AF than the Radeon HD 4890 2GB. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 82112 (205%)

Pixel Rate

The GeForce GTX 880M will be much (about 91%) better at FSAA than the Radeon HD 4890 2GB, and should be capable of handling higher resolutions more effectively. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 14528 (91%)

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 transported across the external memory interface in one second. It is calculated by multiplying the card's interface 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 ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total 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 maximum amount of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock 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 also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.