GeForce 8400 GS 512MB vs GeForce GTX 460

Intro

Compare that to the GeForce GTX 460, which has a clock frequency of 675 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 192-bit bus, and makes use of a 40 nm design. It is comprised of 336 SPUs, 56 TAUs, and 24 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 460		150 Watts
	Difference: 110 Watts (275%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 460 should perform a lot faster than the GeForce 8400 GS 512MB overall. (explain)

GeForce GTX 460		86400 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 80000 (1250%)

Texel Rate

The GeForce GTX 460 is much (approximately 627%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 460		37800 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 32600 (627%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 460 is superior to the GeForce 8400 GS 512MB, by far. (explain)

GeForce GTX 460		16200 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 13600 (523%)

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 max amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 are applied per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.