GeForce 830M vs Radeon HD 4770

Intro

Compare all that to the Radeon HD 4770, which has a GPU core clock speed of 750 MHz, and 512 MB of GDDR5 RAM set to run at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) Stream Processors, 32 TAUs, 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

Theoretically speaking, the Radeon HD 4770 should be 256% quicker than the GeForce 830M in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 4770 should be quite a bit (more or less 46%) faster with regards to anisotropic filtering than the GeForce 830M. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4770 is the winner, by a large margin. (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: Bandwidth is the max amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.