Radeon HD 7990 vs Radeon R9 Nano

Intro

Compare those specifications to the Radeon R9 Nano, which has core clock speeds of 1000 MHz on the GPU, and 500 MHz on the 4096 MB of HBM memory. It features 4096 SPUs along with 256 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

Hide Graphs

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 HD 7990		15520 points
Radeon R9 Nano		14918 points
	Difference: 602 (4%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 Nano		30 Mh/s
	Difference: 2 (7%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 Nano		402 Sol/s
	Difference: 111 (28%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 Nano		175 Watts
Radeon HD 7990		375 Watts
	Difference: 200 Watts (114%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be a little bit faster than the Radeon R9 Nano in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 Nano		512000 MB/sec
	Difference: 64000 (13%)

Texel Rate

The Radeon R9 Nano will be a bit (approximately 5%) faster with regards to AF than the Radeon HD 7990. (explain)

Radeon R9 Nano		256000 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 12800 (5%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 Nano is a better choice, but it probably won't make a huge difference. (explain)

Radeon R9 Nano		64000 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 3200 (5%)

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 (in units of MB per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.