GeForce 8400 GS 512MB vs Geforce GTX 770

Intro

Compare those specifications to the Geforce GTX 770, which features core speeds of 1046 MHz on the GPU, and 1753 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Geforce GTX 770		230 Watts
	Difference: 190 Watts (475%)

Memory Bandwidth

Performance-wise, the Geforce GTX 770 should theoretically be much superior to the GeForce 8400 GS 512MB in general. (explain)

Geforce GTX 770		224384 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 217984 (3406%)

Texel Rate

The Geforce GTX 770 is a lot (more or less 2475%) faster with regards to texture filtering than the GeForce 8400 GS 512MB. (explain)

Geforce GTX 770		133888 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 128688 (2475%)

Pixel Rate

The Geforce GTX 770 will be quite a bit (approximately 1187%) better at FSAA than the GeForce 8400 GS 512MB, and able to handle higher resolutions better. (explain)

Geforce GTX 770		33472 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 30872 (1187%)

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 largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, 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 most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.