GeForce 830M vs GeForce GT 240 GDDR5

Intro

Compare all that to the GeForce GT 240 GDDR5, which features a clock speed of 550 MHz and a GDDR5 memory speed of 850 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 96 SPUs, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
GeForce GT 240 GDDR5		70 Watts
	Difference: 45 Watts (180%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 240 GDDR5 should perform quite a bit faster than the GeForce 830M overall. (explain)

GeForce GT 240 GDDR5		54400 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 40000 (278%)

Texel Rate

The GeForce GT 240 GDDR5 is a little bit (more or less 7%) more effective at texture filtering than the GeForce 830M. (explain)

GeForce GT 240 GDDR5		17600 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 1136 (7%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce 830M is the winner, by a large margin. (explain)

GeForce 830M		8232 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 3832 (87%)

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 across the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher 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 most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many 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.