GeForce 820M vs GeForce GT 430 1GB

Intro

Compare those specs to the GeForce GT 430 1GB, which makes use of a 40 nm design. nVidia has set the core speed at 700 MHz. The GDDR3 memory works at a speed of 900 MHz on this particular card. It features 96 SPUs as well as 16 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GT 430 1GB		60 Watts
	Difference: 45 Watts (300%)

Memory Bandwidth

As far as performance goes, the GeForce GT 430 1GB should in theory be much better than the GeForce 820M in general. (explain)

GeForce GT 430 1GB		28800 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 12800 (80%)

Texel Rate

The GeForce 820M is a bit (approximately 3%) faster with regards to texture filtering than the GeForce GT 430 1GB. (explain)

GeForce 820M		11504 Mtexels/sec
GeForce GT 430 1GB		11200 Mtexels/sec
	Difference: 304 (3%)

Pixel Rate

The GeForce 820M is a small bit (more or less 3%) more effective at AA than the GeForce GT 430 1GB, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce 820M		2876 Mpixels/sec
GeForce GT 430 1GB		2800 Mpixels/sec
	Difference: 76 (3%)

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 moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.