GeForce 8400 GS 512MB vs GeForce GTX 480

Intro

Compare those specs to the GeForce GTX 480, which features GPU clock speed of 700 MHz, and 1536 MB of GDDR5 memory running at 924 MHz through a 384-bit bus. It also is comprised of 480 Stream Processors, 60 TAUs, and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 480		250 Watts
	Difference: 210 Watts (525%)

Memory Bandwidth

Performance-wise, the GeForce GTX 480 should theoretically be quite a bit superior to the GeForce 8400 GS 512MB overall. (explain)

GeForce GTX 480		177408 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 171008 (2672%)

Texel Rate

The GeForce GTX 480 should be a lot (more or less 708%) faster with regards to texture filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 480		42000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 36800 (708%)

Pixel Rate

The GeForce GTX 480 is a lot (about 1192%) better at AA than the GeForce 8400 GS 512MB, and will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 480		33600 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 31000 (1192%)

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 (counted in MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.