Radeon HD 7950 3GB vs Radeon R9 380 2G

Intro

Compare those specs to the Radeon R9 380 2G, which comes with GPU clock speed of 970 MHz, and 2048 MB of GDDR5 RAM running at 1425 MHz through a 256-bit bus. It also features 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 2G		190 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 10 Watts (5%)

Memory Bandwidth

In theory, the Radeon HD 7950 3GB should be much faster than the Radeon R9 380 2G overall. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R9 380 2G		182400 MB/sec
	Difference: 57600 (32%)

Texel Rate

The Radeon R9 380 2G will be much (about 21%) better at AF than the Radeon HD 7950 3GB. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 19040 (21%)

Pixel Rate

The Radeon R9 380 2G is much (approximately 21%) more effective at full screen anti-aliasing than the Radeon HD 7950 3GB, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
Radeon HD 7950 3GB		25600 Mpixels/sec
	Difference: 5440 (21%)

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 information (in units of MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.