Radeon HD 6990 vs Radeon R9 380 4G

Intro

Compare that to the Radeon R9 380 4G, which uses a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 RAM works at a frequency of 1425 MHz on this card. It features 1792 SPUs as well as 112 Texture Address Units 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 4G		8837 points
Radeon HD 6990		5820 points
	Difference: 3017 (52%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Radeon R9 380 4G		21 Mh/s
	Difference: 3 (14%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 4G		190 Watts
Radeon HD 6990		375 Watts
	Difference: 185 Watts (97%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should theoretically be quite a bit better than the Radeon R9 380 4G overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 380 4G		182400 MB/sec
	Difference: 137600 (75%)

Texel Rate

The Radeon HD 6990 is quite a bit (more or less 47%) better at anisotropic filtering than the Radeon R9 380 4G. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 380 4G		108640 Mtexels/sec
	Difference: 50720 (47%)

Pixel Rate

The Radeon HD 6990 should be a lot (approximately 71%) faster with regards to AA than the Radeon R9 380 4G, and should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 380 4G		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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that are applied per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.