GeForce 8400 GS 512MB vs GeForce GTX 960M

Intro

Compare those specifications to the GeForce GTX 960M, which features a core clock frequency of 1096 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 960M		65 Watts
	Difference: 25 Watts (63%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 960M should be a lot faster than the GeForce 8400 GS 512MB in general. (explain)

GeForce GTX 960M		64000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 57600 (900%)

Texel Rate

The GeForce GTX 960M will be quite a bit (approximately 743%) better at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 960M		43840 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 38640 (743%)

Pixel Rate

The GeForce GTX 960M will be a lot (more or less 574%) faster with regards to full screen anti-aliasing than the GeForce 8400 GS 512MB, and also capable of handling higher resolutions better. (explain)

GeForce GTX 960M		17536 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 14936 (574%)

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 data (measured in megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.