GeForce 820M vs GeForce GT 230

Intro

Compare all that to the GeForce GT 230, which comes with a core clock frequency of 550 MHz and a DDR3 memory frequency of 800 MHz. It also features a 192-bit bus, and makes use of a 40 nm design. It features 32 SPUs, 16 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GT 230		65 Watts
	Difference: 50 Watts (333%)

Memory Bandwidth

The GeForce GT 230, in theory, should be a lot faster than the GeForce 820M in general. (explain)

GeForce GT 230		38400 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 22400 (140%)

Texel Rate

The GeForce 820M will be a lot (more or less 31%) faster with regards to texture filtering than the GeForce GT 230. (explain)

GeForce 820M		11504 Mtexels/sec
GeForce GT 230		8800 Mtexels/sec
	Difference: 2704 (31%)

Pixel Rate

The GeForce GT 230 will be a lot (more or less 53%) more effective at full screen anti-aliasing than the GeForce 820M, and also will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GT 230		4400 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 1524 (53%)

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 (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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