Radeon HD 6990 vs Radeon R9 270X

Intro

Compare those specifications to the Radeon R9 270X, which comes with a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1400 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1280 SPUs, 80 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 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 is 79% faster 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 much (about 99%) better at anisotropic 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 FSAA than the Radeon R9 270X, and also will be able to handle higher screen resolutions better. (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 maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 are applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.