GeForce GT 240 GDDR5 vs GeForce GT 320

Intro

Compare all of that to the GeForce GT 320, which comes with a GPU core clock speed of 540 MHz, and 1024 MB of GDDR3 memory set to run at 790 MHz through a 128-bit bus. It also features 72 SPUs, 24 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
GeForce GT 240 GDDR5		70 Watts
	Difference: 27 Watts (63%)

Memory Bandwidth

In theory, the GeForce GT 240 GDDR5 will be 115% quicker than the GeForce GT 320 overall, due to its higher data rate. (explain)

GeForce GT 240 GDDR5		54400 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 29120 (115%)

Texel Rate

The GeForce GT 240 GDDR5 should be a lot (approximately 36%) more effective at AF than the GeForce GT 320. (explain)

GeForce GT 240 GDDR5		17600 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 4640 (36%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GT 240 GDDR5 is the winner, but not by far. (explain)

GeForce GT 240 GDDR5		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 largest amount of data (measured in MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once 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 can be processed in one second. This is calculated by multiplying the total texture units by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.