GeForce 920M vs GeForce 9800 GT 512MB

Intro

Compare those specifications to the GeForce 9800 GT 512MB, which has core clock speeds of 600 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 112 SPUs as well as 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce 9800 GT 512MB is 300% faster than the GeForce 920M in general, because of its higher bandwidth. (explain)

GeForce 9800 GT 512MB		57600 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 43200 (300%)

Texel Rate

The GeForce 9800 GT 512MB should be a little bit (more or less 10%) better at anisotropic filtering than the GeForce 920M. (explain)

GeForce 9800 GT 512MB		33600 Mtexels/sec
GeForce 920M		30528 Mtexels/sec
	Difference: 3072 (10%)

Pixel Rate

The GeForce 9800 GT 512MB should be much (more or less 26%) more effective at full screen anti-aliasing than the GeForce 920M, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce 9800 GT 512MB		9600 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 1968 (26%)

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 maximum amount of data (in units of MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video 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 maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.