Radeon HD 6990 vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which features GPU core speed of 1050 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also features 2816 Stream Processors, 176 Texture Address Units, 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.

3DMark Fire Strike Graphics Score

Radeon R9 390X 8G		13555 points
Radeon HD 6990		5820 points
	Difference: 7735 (133%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G		32 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 8 (33%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon R9 390X 8G should theoretically be a bit superior to the Radeon HD 6990 in general. (explain)

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

Texel Rate

The Radeon R9 390X 8G should be a bit (more or less 16%) better at anisotropic filtering than the Radeon HD 6990. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 25440 (16%)

Pixel Rate

The Radeon R9 390X 8G will be much (approximately 27%) more effective at AA than the Radeon HD 6990, and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 14080 (27%)

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 maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant 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.