GeForce 820M vs GeForce GT 430 1GB

Intro

Compare all of that to the GeForce GT 430 1GB, which uses a 40 nm design. nVidia has set the core frequency at 700 MHz. The GDDR3 memory works at a speed of 900 MHz on this specific card. It features 96 SPUs along with 16 Texture Address Units and 4 ROPs.

Display Graphs

Hide Graphs

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

Theoretically speaking, the GeForce GT 430 1GB will be 80% faster than the GeForce 820M overall, due to its greater data rate. (explain)

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

Texel Rate

The GeForce 820M will be a little bit (approximately 3%) better at AF than the GeForce GT 430 1GB. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 820M is superior to the GeForce GT 430 1GB, but only just. (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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.