Radeon HD 6990 vs Radeon R9 Nano

Intro

Compare those specifications to the Radeon R9 Nano, which comes with GPU clock speed of 1000 MHz, and 4096 MB of HBM RAM set to run at 500 MHz through a 4096-bit bus. It also is comprised of 4096 Stream Processors, 256 TAUs, and 64 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 Nano		14918 points
Radeon HD 6990		5820 points
	Difference: 9098 (156%)

Ethereum Mining Hash Rate

Radeon R9 Nano		30 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 6 (25%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 Nano		175 Watts
Radeon HD 6990		375 Watts
	Difference: 200 Watts (114%)

Memory Bandwidth

Theoretically, the Radeon R9 Nano should perform much faster than the Radeon HD 6990 overall. (explain)

Radeon R9 Nano		512000 MB/sec
Radeon HD 6990		320000 MB/sec
	Difference: 192000 (60%)

Texel Rate

The Radeon R9 Nano should be a lot (more or less 61%) better at AF than the Radeon HD 6990. (explain)

Radeon R9 Nano		256000 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 96640 (61%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 Nano is the winner, but it probably won't make a huge difference. (explain)

Radeon R9 Nano		64000 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 10880 (20%)

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 information (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 applied per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.