GeForce 8400 GS 512MB vs GeForce GTX 850M

Intro

Compare all of that to the GeForce GTX 850M, which features a clock frequency of 876 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the GeForce GTX 850M should be 400% faster than the GeForce 8400 GS 512MB in general, due to its higher bandwidth. (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 quite a bit (approximately 574%) more effective at 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

The GeForce GTX 850M should be much (about 439%) faster with regards to FSAA than the GeForce 8400 GS 512MB, and should be capable of handling higher resolutions while still performing well. (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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.