GeForce 940M vs GeForce 9800 GT 1GB

Intro

Compare those specifications to the GeForce 9800 GT 1GB, which comes with a GPU core clock speed of 600 MHz, and 1024 MB of GDDR3 memory running at 900 MHz through a 256-bit bus. It also is comprised of 112 Stream Processors, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GT 1GB should be much faster than the GeForce 940M in general. (explain)

GeForce 9800 GT 1GB		57600 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The GeForce 9800 GT 1GB will be a lot (approximately 31%) more effective at anisotropic filtering than the GeForce 940M. (explain)

GeForce 9800 GT 1GB		33600 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 7872 (31%)

Pixel Rate

The GeForce 9800 GT 1GB is a small bit (approximately 12%) more effective at anti-aliasing than the GeForce 940M, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 9800 GT 1GB		9600 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 1024 (12%)

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 transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.