GeForce GT 320 vs GeForce GT 340

Intro

Compare all that to the GeForce GT 340, which comes with a clock speed of 550 MHz and a GDDR5 memory frequency of 850 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 96 SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
GeForce GT 340		69 Watts
	Difference: 26 Watts (60%)

Memory Bandwidth

In theory, the GeForce GT 340 will be 115% faster than the GeForce GT 320 in general, because of its greater data rate. (explain)

GeForce GT 340		54400 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 29120 (115%)

Texel Rate

The GeForce GT 340 should be much (approximately 36%) better at AF than the GeForce GT 320. (explain)

GeForce GT 340		17600 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 4640 (36%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GT 340 is the winner, but not by far. (explain)

GeForce GT 340		4400 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 80 (2%)

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

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