Radeon HD 6990 vs Radeon R9 380 4G

Intro

Compare that to the Radeon R9 380 4G, which comes with core clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. 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

The Radeon HD 6990 should theoretically be much faster 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 should be a lot (about 47%) more effective 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 will be much (approximately 71%) faster with regards to AA than the Radeon R9 380 4G, and also will be able to handle 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 information (counted in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number 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 speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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