GeForce 820M vs Radeon HD 4670 1GB

Intro

Compare that to the Radeon HD 4670 1GB, which makes use of a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 memory runs at a speed of 1100 MHz on this particular model. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 4670 1GB		70 Watts
	Difference: 55 Watts (367%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4670 1GB should be much faster than the GeForce 820M in general. (explain)

Radeon HD 4670 1GB		35200 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 19200 (120%)

Texel Rate

The Radeon HD 4670 1GB should be quite a bit (about 109%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 12496 (109%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4670 1GB is the winner, and very much so. (explain)

Radeon HD 4670 1GB		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 max amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units of the card by the core clock 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.