GeForce GT 340 vs GeForce GTX 480

Intro

Compare those specs to the GeForce GTX 480, which comes with a clock speed of 700 MHz and a GDDR5 memory speed of 924 MHz. It also makes use of a 384-bit bus, and makes use of a 40 nm design. It features 480 SPUs, 60 Texture Address Units, and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
GeForce GTX 480		250 Watts
	Difference: 181 Watts (262%)

Memory Bandwidth

Performance-wise, the GeForce GTX 480 should in theory be much superior to the GeForce GT 340 overall. (explain)

GeForce GTX 480		177408 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 123008 (226%)

Texel Rate

The GeForce GTX 480 is quite a bit (more or less 139%) better at AF than the GeForce GT 340. (explain)

GeForce GTX 480		42000 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 24400 (139%)

Pixel Rate

The GeForce GTX 480 will be quite a bit (approximately 664%) better at AA than the GeForce GT 340, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 480		33600 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 29200 (664%)

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 data (counted in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher 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 amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.