GeForce 820M vs Radeon HD 4670 512MB

Intro

Compare those specs to the Radeon HD 4670 512MB, which features GPU core speed of 750 MHz, and 512 MB of GDDR4/GDDR3/DDR3/DDR2 memory set to run at 1000 MHz through a 128-bit bus. It also is comprised of 320(64x5) Stream Processors, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 4670 512MB		70 Watts
	Difference: 55 Watts (367%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 512MB should theoretically be a lot better than the GeForce 820M overall. (explain)

Radeon HD 4670 512MB		32000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 16000 (100%)

Texel Rate

The Radeon HD 4670 512MB will be a lot (approximately 109%) better at texture filtering than the GeForce 820M. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 12496 (109%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4670 512MB is the winner, by far. (explain)

Radeon HD 4670 512MB		6000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 3124 (109%)

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 largest amount of information (measured in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can 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 ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.