GeForce 8400 GS 512MB vs Geforce GTX 780

Intro

Compare those specifications to the Geforce GTX 780, which comes with GPU clock speed of 863 MHz, and 3072 MB of GDDR5 memory set to run at 1502 MHz through a 384-bit bus. It also is made up of 2304 SPUs, 192 Texture Address Units, and 48 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Geforce GTX 780		250 Watts
	Difference: 210 Watts (525%)

Memory Bandwidth

The Geforce GTX 780 should theoretically be a lot faster than the GeForce 8400 GS 512MB in general. (explain)

Geforce GTX 780		288384 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 281984 (4406%)

Texel Rate

The Geforce GTX 780 is a lot (about 3086%) faster with regards to AF than the GeForce 8400 GS 512MB. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 160496 (3086%)

Pixel Rate

If using a high screen resolution is important to you, then the Geforce GTX 780 is superior to the GeForce 8400 GS 512MB, and very much so. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 38824 (1493%)

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 information (measured in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 potential to get to the maximum fill rate.