GeForce GT 220 GDDR3 vs Radeon HD 7970

Intro

Compare all of that to the Radeon HD 7970, which comes with GPU core speed of 925 MHz, and 3072 MB of GDDR5 RAM set to run at 1375 MHz through a 384-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 7970		250 Watts
	Difference: 192 Watts (331%)

Memory Bandwidth

The Radeon HD 7970 should theoretically perform much faster than the GeForce GT 220 GDDR3 in general. (explain)

Radeon HD 7970		264000 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 231616 (715%)

Texel Rate

The Radeon HD 7970 is much (about 1084%) faster with regards to AF than the GeForce GT 220 GDDR3. (explain)

Radeon HD 7970		118400 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 108400 (1084%)

Pixel Rate

The Radeon HD 7970 will be quite a bit (about 492%) more effective at full screen anti-aliasing than the GeForce GT 220 GDDR3, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7970		29600 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 24600 (492%)

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 (measured in MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs 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 lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.