GeForce 920M vs GeForce 9400 GT 256MB

Intro

Compare all that to the GeForce 9400 GT 256MB, which uses a 65 nm design. nVidia has set the core speed at 550 MHz. The GDDR2 RAM works at a speed of 400 MHz on this specific model. It features 16 SPUs along with 8 TAUs and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce 920M, in theory, should be a small bit faster than the GeForce 9400 GT 256MB in general. (explain)

GeForce 920M		14400 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 1600 (13%)

Texel Rate

The GeForce 920M will be a lot (more or less 594%) faster with regards to texture filtering than the GeForce 9400 GT 256MB. (explain)

GeForce 920M		30528 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 26128 (594%)

Pixel Rate

The GeForce 920M will be quite a bit (more or less 247%) more effective at FSAA than the GeForce 9400 GT 256MB, and also will be able to handle higher resolutions better. (explain)

GeForce 920M		7632 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 5432 (247%)

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 max amount of information (measured in MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics 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 most pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.