GeForce GT 220 GDDR3 vs GeForce GTX 660

Intro

Compare all that to the GeForce GTX 660, which uses a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 memory works at a frequency of 1502 MHz on this particular card. It features 960 SPUs along with 80 TAUs and 24 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
GeForce GTX 660		140 Watts
	Difference: 82 Watts (141%)

Memory Bandwidth

The GeForce GTX 660 should in theory be much faster than the GeForce GT 220 GDDR3 overall. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 111808 (345%)

Texel Rate

The GeForce GTX 660 will be quite a bit (more or less 684%) faster with regards to anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 68400 (684%)

Pixel Rate

The GeForce GTX 660 will be quite a bit (about 370%) more effective at full screen anti-aliasing than the GeForce GT 220 GDDR3, and will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 18520 (370%)

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 (counted in MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.