GeForce GT 315 vs GeForce GT 340

Intro

Compare those specs to the GeForce GT 340, which features clock speeds of 550 MHz on the GPU, and 850 MHz on the 512 MB of GDDR5 memory. It features 96 SPUs along with 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
GeForce GT 340		69 Watts
	Difference: 17 Watts (33%)

Memory Bandwidth

In theory, the GeForce GT 340 is 115% faster than the GeForce GT 315 overall, because of its greater data rate. (explain)

GeForce GT 340		54400 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 29120 (115%)

Texel Rate

The GeForce GT 340 should be much (more or less 76%) faster with regards to AF than the GeForce GT 315. (explain)

GeForce GT 340		17600 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 7600 (76%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GT 315 is the winner, not by a very large margin though. (explain)

GeForce GT 315		5000 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 600 (14%)

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 largest amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high 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 number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per 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. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.