Radeon HD 6990 vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which comes with core speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 160 Texture Address Units and 64 ROPs.

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 should theoretically perform a small bit faster than the Radeon HD 6990 overall. (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 bit (approximately 0%) better at 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 lots of anti-aliasing is important to you, then the Radeon R9 390 8G is a better choice, but not by far. (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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount 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 filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.