Radeon HD 6990 vs Radeon R9 270X

Intro

Compare those specifications to the Radeon R9 270X, which comes with GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1400 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 Texture Address Units, and 32 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 270X		6590 points
Radeon HD 6990		5820 points
	Difference: 770 (13%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Radeon R9 270X		18 Mh/s
	Difference: 6 (33%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X		180 Watts
Radeon HD 6990		375 Watts
	Difference: 195 Watts (108%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 will be 79% quicker than the Radeon R9 270X in general, due to its higher data rate. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 270X		179200 MB/sec
	Difference: 140800 (79%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 99%) more effective at texture filtering than the Radeon R9 270X. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 270X		80000 Mtexels/sec
	Difference: 79360 (99%)

Pixel Rate

The Radeon HD 6990 should be a lot (approximately 66%) faster with regards to full screen anti-aliasing than the Radeon R9 270X, and should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 270X		32000 Mpixels/sec
	Difference: 21120 (66%)

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 information (measured in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units by the core clock 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 most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.