GeForce GTX 870M vs Radeon HD 4830 512MB

Intro

Compare that to the Radeon HD 4830 512MB, which comes with core clock speeds of 575 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
GeForce GTX 870M		110 Watts
	Difference: 15 Watts (16%)

Memory Bandwidth

In theory, the GeForce GTX 870M will be 67% quicker than the Radeon HD 4830 512MB overall, because of its higher data rate. (explain)

GeForce GTX 870M		96000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 38400 (67%)

Texel Rate

The GeForce GTX 870M is quite a bit (about 473%) better at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 86992 (473%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 870M is a better choice, by far. (explain)

GeForce GTX 870M		22584 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 13384 (145%)

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 (counted in megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 processed in one second. This figure 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in a 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 drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.