GeForce GT 220 GDDR3 vs Radeon HD 6790

Intro

Compare all that to the Radeon HD 6790, which features a clock speed of 840 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 6790		150 Watts
	Difference: 92 Watts (159%)

Memory Bandwidth

In theory, the Radeon HD 6790 is 315% faster than the GeForce GT 220 GDDR3 overall, because of its higher bandwidth. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 102016 (315%)

Texel Rate

The Radeon HD 6790 should be much (more or less 236%) more effective at texture filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 6790		33600 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 23600 (236%)

Pixel Rate

The Radeon HD 6790 will be quite a bit (more or less 169%) better at AA than the GeForce GT 220 GDDR3, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6790		13440 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 8440 (169%)

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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units of the card 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.