GeForce GT 220 GDDR3 vs Radeon HD 3690/3830

Intro

Compare all that to the Radeon HD 3690/3830, which comes with a clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, 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 3690/3830		75 Watts
	Difference: 17 Watts (29%)

Memory Bandwidth

In theory, the GeForce GT 220 GDDR3 should be a lot faster than the Radeon HD 3690/3830 in general. (explain)

GeForce GT 220 GDDR3		32384 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 5888 (22%)

Texel Rate

The Radeon HD 3690/3830 will be a bit (about 7%) more effective at AF than the GeForce GT 220 GDDR3. (explain)

Radeon HD 3690/3830		10688 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 688 (7%)

Pixel Rate

The Radeon HD 3690/3830 is much (more or less 114%) faster with regards to anti-aliasing than the GeForce GT 220 GDDR3, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 5688 (114%)

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 (in units of MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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