Radeon HD 6770 1GB vs Radeon R9 380 2G

Intro

Compare all that to the Radeon R9 380 2G, which comes with clock speeds of 970 MHz on the GPU, and 1425 MHz on the 2048 MB of GDDR5 memory. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon R9 380 2G		190 Watts
	Difference: 82 Watts (76%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 2G should be 171% quicker than the Radeon HD 6770 1GB in general, due to its higher bandwidth. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 115200 (171%)

Texel Rate

The Radeon R9 380 2G will be quite a bit (about 202%) better at anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 72640 (202%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 380 2G is superior to the Radeon HD 6770 1GB, and very much so. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 16640 (116%)

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 (in units of megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics 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 most pixels the graphics card can possibly record to the 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 the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.