GeForce 820M vs GeForce GT 240 GDDR5 1GB

Intro

Compare all of that to the GeForce GT 240 GDDR5 1GB, which has GPU clock speed of 550 MHz, and 1024 MB of GDDR5 memory set to run at 850 MHz through a 128-bit bus. It also is comprised of 96 Stream Processors, 32 TAUs, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GT 240 GDDR5 1GB		70 Watts
	Difference: 55 Watts (367%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 240 GDDR5 1GB is 240% faster than the GeForce 820M in general, due to its higher bandwidth. (explain)

GeForce GT 240 GDDR5 1GB		54400 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 38400 (240%)

Texel Rate

The GeForce GT 240 GDDR5 1GB is quite a bit (approximately 53%) more effective at anisotropic filtering than the GeForce 820M. (explain)

GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 6096 (53%)

Pixel Rate

The GeForce GT 240 GDDR5 1GB should be a lot (more or less 53%) faster with regards to full screen anti-aliasing than the GeForce 820M, and capable of handling higher resolutions without slowing down too much. (explain)

GeForce GT 240 GDDR5 1GB		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: Memory bandwidth is the max amount of data (counted in MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.