Radeon HD 7950 3GB vs Radeon R9 390 8G

Intro

Compare that to the Radeon R9 390 8G, which comes with GPU core speed of 1000 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2560 SPUs, 160 TAUs, and 64 Raster Operation Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

Zcash Mining Hash Rate

Radeon R9 390 8G		326 Sol/s
Radeon HD 7950 3GB		229 Sol/s
	Difference: 97 (42%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB		200 Watts
Radeon R9 390 8G		275 Watts
	Difference: 75 Watts (38%)

Memory Bandwidth

The Radeon R9 390 8G should theoretically perform much faster than the Radeon HD 7950 3GB in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 7950 3GB		240000 MB/sec
	Difference: 144000 (60%)

Texel Rate

The Radeon R9 390 8G is a lot (more or less 79%) more effective at texture filtering than the Radeon HD 7950 3GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 70400 (79%)

Pixel Rate

The Radeon R9 390 8G should be much (more or less 150%) better at full screen anti-aliasing than the Radeon HD 7950 3GB, and also capable of handling higher resolutions while still performing well. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 7950 3GB		25600 Mpixels/sec
	Difference: 38400 (150%)

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 maximum amount of information (measured in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount 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, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.