GeForce GT 220 GDDR3 vs Radeon HD 6770

Intro

Compare all that to the Radeon HD 6770, which comes with a GPU core clock speed of 900 MHz, and 512 MB of GDDR5 RAM set to run at 1050 MHz through a 128-bit bus. It also is comprised of 800 Stream Processors, 40 TAUs, and 16 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 6770		108 Watts
	Difference: 50 Watts (86%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 should perform quite a bit faster than the GeForce GT 220 GDDR3 overall. (explain)

Radeon HD 6770		67200 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 34816 (108%)

Texel Rate

The Radeon HD 6770 will be a lot (more or less 260%) better at anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 26000 (260%)

Pixel Rate

The Radeon HD 6770 will be quite a bit (approximately 188%) better at FSAA than the GeForce GT 220 GDDR3, and capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 9400 (188%)

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 information (counted in megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range 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 amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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