GeForce GT 220 GDDR3 vs Radeon HD 6790

Intro

Compare all that to the Radeon HD 6790, which uses a 40 nm design. AMD has set the core speed at 840 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this particular card. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

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 will be 315% quicker than the GeForce GT 220 GDDR3 overall, due to 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 is a lot (more or less 236%) better at AF 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 is quite a bit (about 169%) faster with regards to anti-aliasing than the GeForce GT 220 GDDR3, and should be able to handle higher resolutions better. (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 max amount of data (in units of MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that can be processed per second. This number 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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