Radeon HD 6990 vs Radeon R9 270

Intro

Compare those specifications to the Radeon R9 270, which has GPU core speed of 900 MHz, and 2048 MB of GDDR5 RAM running 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 270		5943 points
Radeon HD 6990		5820 points
	Difference: 123 (2%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Radeon R9 270		15 Mh/s
	Difference: 9 (60%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270		150 Watts
Radeon HD 6990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

In theory, the Radeon HD 6990 should be quite a bit faster than the Radeon R9 270 overall. (explain)

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

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 121%) more effective at texture filtering than the Radeon R9 270. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 270		72000 Mtexels/sec
	Difference: 87360 (121%)

Pixel Rate

The Radeon HD 6990 should be a lot (approximately 84%) more effective at full screen anti-aliasing than the Radeon R9 270, and capable of handling higher resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 270		28800 Mpixels/sec
	Difference: 24320 (84%)

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 largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once 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 anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.