Radeon HD 7950 3GB vs Radeon R9 390 8G

Intro

Compare all of that to the Radeon R9 390 8G, which features a GPU core clock speed of 1000 MHz, and 8192 MB of GDDR5 memory running 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

Theoretically, the Radeon R9 390 8G should be 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 will be much (approximately 79%) better at AF 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 is a lot (more or less 150%) faster with regards to anti-aliasing than the Radeon HD 7950 3GB, and able to handle higher screen resolutions without slowing down too much. (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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.