GeForce 8400 GS 512MB vs GeForce GTX 850M

Intro

Compare those specs to the GeForce GTX 850M, which comes with clock speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The GeForce GTX 850M should in theory be a lot faster than the GeForce 8400 GS 512MB in general. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 25600 (400%)

Texel Rate

The GeForce GTX 850M will be much (more or less 574%) faster with regards to AF than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 29840 (574%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 850M is the winner, and very much so. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 11416 (439%)

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 maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.