Radeon HD 6770 1GB vs Radeon R9 380X

Intro

Compare those specs to the Radeon R9 380X, which features GPU core speed of 970 MHz, and 4096 MB of GDDR5 memory set to run at 1425 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon R9 380X, in theory, should be much faster than the Radeon HD 6770 1GB overall. (explain)

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

Texel Rate

The Radeon R9 380X should be a lot (more or less 245%) more effective at AF than the Radeon HD 6770 1GB. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 88160 (245%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 380X is the winner, by far. (explain)

Radeon R9 380X		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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once 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 high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.