Radeon HD 6990 vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory is set to run at a speed of 1500 MHz on this card. It features 2560 SPUs along with 160 Texture Address Units and 64 Rasterization Operator 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.

3DMark Fire Strike Graphics Score

Radeon R9 390 8G		12733 points
Radeon HD 6990		5820 points
	Difference: 6913 (119%)

Ethereum Mining Hash Rate

Radeon R9 390 8G		28 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 4 (17%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 390 8G		275 Watts
Radeon HD 6990		375 Watts
	Difference: 100 Watts (36%)

Memory Bandwidth

The Radeon R9 390 8G, in theory, should perform a small bit faster than the Radeon HD 6990 in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 6990		320000 MB/sec
	Difference: 64000 (20%)

Texel Rate

The Radeon R9 390 8G is a little bit (approximately 0%) faster with regards to AF than the Radeon HD 6990. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 640 (0%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 390 8G is a better choice, though only just barely. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 10880 (20%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling 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 can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.