GeForce 930M vs GeForce 9400 GT 256MB

Intro

Compare those specs to the GeForce 9400 GT 256MB, which has a core clock frequency of 550 MHz and a GDDR2 memory speed of 400 MHz. It also uses a 128-bit bus, and uses a 65 nm design. It is comprised of 16 SPUs, 8 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce 930M should in theory be a little bit superior to the GeForce 9400 GT 256MB in general. (explain)

GeForce 930M		14400 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 1600 (13%)

Texel Rate

The GeForce 930M will be a lot (more or less 406%) better at anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

GeForce 930M		22272 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 17872 (406%)

Pixel Rate

The GeForce 930M is a lot (approximately 237%) faster with regards to full screen anti-aliasing than the GeForce 9400 GT 256MB, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce 930M		7424 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 5224 (237%)

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 moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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