GeForce 830M vs Radeon HD 4870 1GB

Intro

Compare that to the Radeon HD 4870 1GB, which comes with core clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 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 830M		25 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 125 Watts (500%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 1GB should be a lot faster than the GeForce 830M in general. (explain)

Radeon HD 4870 1GB		115200 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 100800 (700%)

Texel Rate

The Radeon HD 4870 1GB should be much (approximately 82%) better at texture filtering than the GeForce 830M. (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 13536 (82%)

Pixel Rate

The Radeon HD 4870 1GB should be quite a bit (about 46%) more effective at AA than the GeForce 830M, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4870 1GB		12000 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 3768 (46%)

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 data (measured in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.