GeForce GT 220 GDDR3 vs Radeon HD 6870

Intro

Compare those specifications to the Radeon HD 6870, which has a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It features 1120 SPUs, 56 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 6870		151 Watts
	Difference: 93 Watts (160%)

Memory Bandwidth

In theory, the Radeon HD 6870 should be 315% quicker than the GeForce GT 220 GDDR3 in general, because of its higher data rate. (explain)

Radeon HD 6870		134400 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 102016 (315%)

Texel Rate

The Radeon HD 6870 should be a lot (approximately 404%) better at AF than the GeForce GT 220 GDDR3. (explain)

Radeon HD 6870		50400 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 40400 (404%)

Pixel Rate

The Radeon HD 6870 is quite a bit (more or less 476%) faster with regards to AA than the GeForce GT 220 GDDR3, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6870		28800 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 23800 (476%)

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 megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.