GeForce 820M vs GeForce GT 430

Intro

Compare that to the GeForce GT 430, which comes with a core clock speed of 700 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It features 96 SPUs, 16 TAUs, and 4 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the GeForce GT 430 will be 80% faster than the GeForce 820M overall, due to its higher data rate. (explain)

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

Texel Rate

The GeForce 820M will be a small bit (about 3%) more effective at anisotropic filtering than the GeForce GT 430. (explain)

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

Pixel Rate

The GeForce 820M will be a small bit (approximately 3%) better at FSAA than the GeForce GT 430, and also capable of handling higher resolutions better. (explain)

GeForce 820M		2876 Mpixels/sec
GeForce GT 430		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: Memory bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 number of texture map elements (texels) that can be applied per 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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