Radeon HD 7950 3GB vs Radeon R9 380 2G

Intro

Compare all of that to the Radeon R9 380 2G, which has a clock speed of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also features a 256-bit bus, and uses a 28 nm design. It features 1792 SPUs, 112 TAUs, and 32 ROPs.

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

Theoretically speaking, the Radeon HD 7950 3GB is 32% quicker than the Radeon R9 380 2G overall, due to its greater bandwidth. (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 is a lot (approximately 21%) more effective 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

If using high levels of AA is important to you, then the Radeon R9 380 2G is superior to the Radeon HD 7950 3GB, and very much so. (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: Bandwidth is the max amount of information (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's 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 output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.