GeForce GT 340 vs GeForce GTX 580

Intro

Compare those specifications to the GeForce GTX 580, which comes with a clock frequency of 772 MHz and a GDDR5 memory speed of 1002 MHz. It also features a 384-bit bus, and uses a 40 nm design. It is comprised of 512 SPUs, 64 TAUs, and 48 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
GeForce GTX 580		244 Watts
	Difference: 175 Watts (254%)

Memory Bandwidth

The GeForce GTX 580 should theoretically be a lot faster than the GeForce GT 340 in general. (explain)

GeForce GTX 580		192384 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 137984 (254%)

Texel Rate

The GeForce GTX 580 will be quite a bit (more or less 181%) faster with regards to anisotropic filtering than the GeForce GT 340. (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 31808 (181%)

Pixel Rate

The GeForce GTX 580 will be quite a bit (more or less 742%) more effective at AA than the GeForce GT 340, and also capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 32656 (742%)

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 maximum amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.