GeForce GT 315 vs GeForce GT 320

Intro

Compare all that to the GeForce GT 320, which has a GPU core clock speed of 540 MHz, and 1024 MB of GDDR3 RAM running at 790 MHz through a 128-bit bus. It also is comprised of 72 Stream Processors, 24 TAUs, 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 315		52 Watts
	Difference: 9 Watts (21%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The GeForce GT 320 should be a lot (approximately 30%) better at texture filtering than the GeForce GT 315. (explain)

GeForce GT 320		12960 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 2960 (30%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GT 315 is superior to the GeForce GT 320, but it probably won't make a huge difference. (explain)

GeForce GT 315		5000 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 680 (16%)

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 information (measured in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the 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 that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.