Radeon HD 7950 3GB vs Radeon R9 380 4G

Intro

Compare that to the Radeon R9 380 4G, which comes with GPU clock speed of 970 MHz, and 4096 MB of GDDR5 RAM running at 1425 MHz through a 256-bit bus. It also features 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 4G		190 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 10 Watts (5%)

Memory Bandwidth

The Radeon HD 7950 3GB, in theory, should perform much faster than the Radeon R9 380 4G in general. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R9 380 4G		182400 MB/sec
	Difference: 57600 (32%)

Texel Rate

The Radeon R9 380 4G will be much (more or less 21%) better at anisotropic filtering than the Radeon HD 7950 3GB. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 19040 (21%)

Pixel Rate

The Radeon R9 380 4G will be a lot (about 21%) faster with regards to anti-aliasing than the Radeon HD 7950 3GB, and will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 380 4G		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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per 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 better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.