GeForce GT 220 GDDR3 vs GeForce GT 240 GDDR5 1GB

Intro

Compare those specifications to the GeForce GT 240 GDDR5 1GB, which features clock speeds of 550 MHz on the GPU, and 850 MHz on the 1024 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 220 GDDR3		58 Watts
GeForce GT 240 GDDR5 1GB		70 Watts
	Difference: 12 Watts (21%)

Memory Bandwidth

As far as performance goes, the GeForce GT 240 GDDR5 1GB should theoretically be quite a bit better than the GeForce GT 220 GDDR3 overall. (explain)

GeForce GT 240 GDDR5 1GB		54400 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 22016 (68%)

Texel Rate

The GeForce GT 240 GDDR5 1GB is much (approximately 76%) faster with regards to AF than the GeForce GT 220 GDDR3. (explain)

GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 7600 (76%)

Pixel Rate

The GeForce GT 220 GDDR3 should be a little bit (more or less 14%) faster with regards to anti-aliasing than the GeForce GT 240 GDDR5 1GB, and also able to handle higher resolutions while still performing well. (explain)

GeForce GT 220 GDDR3		5000 Mpixels/sec
GeForce GT 240 GDDR5 1GB		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 max amount of data (counted in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 number of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.