GeForce 830M vs Radeon HD 4770

Intro

Compare all that to the Radeon HD 4770, which comes with GPU clock speed of 750 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon HD 4770		80 Watts
	Difference: 55 Watts (220%)

Memory Bandwidth

Performance-wise, the Radeon HD 4770 should in theory be quite a bit better than the GeForce 830M overall. (explain)

Radeon HD 4770		51200 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 36800 (256%)

Texel Rate

The Radeon HD 4770 will be quite a bit (about 46%) faster with regards to texture filtering than the GeForce 830M. (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 7536 (46%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4770 is the winner, and very much so. (explain)

Radeon HD 4770		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 (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.