Radeon HD 6990 vs Radeon R9 380 2G

Intro

Compare that to the Radeon R9 380 2G, which has a clock speed of 970 MHz and a GDDR5 memory frequency of 1425 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1792 SPUs, 112 TAUs, and 32 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 380 2G		8850 points
Radeon HD 6990		5820 points
	Difference: 3030 (52%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Radeon R9 380 2G		19 Mh/s
	Difference: 5 (26%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 2G		190 Watts
Radeon HD 6990		375 Watts
	Difference: 185 Watts (97%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should in theory be quite a bit superior to the Radeon R9 380 2G in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 380 2G		182400 MB/sec
	Difference: 137600 (75%)

Texel Rate

The Radeon HD 6990 is much (approximately 47%) better at AF than the Radeon R9 380 2G. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 380 2G		108640 Mtexels/sec
	Difference: 50720 (47%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6990 is superior to the Radeon R9 380 2G, by a large margin. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 380 2G		31040 Mpixels/sec
	Difference: 22080 (71%)

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 max amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.