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 speed of 800 MHz. It also makes use of a 192-bit memory bus, and makes use of a 40 nm design. It features 32 SPUs, 16 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the GeForce GT 230 should perform 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 should be much (more or less 31%) faster with regards to anisotropic 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 much (more or less 53%) faster with regards to AA than the GeForce 820M, and should be able to handle higher screen resolutions without slowing down too much. (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 data (in units of MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units 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 of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.