Radeon HD 7990 vs Radeon Pro Duo

Intro

Compare all that to the Radeon Pro Duo, which has a core clock speed of 1000 MHz and a HBM memory frequency of 500 MHz. It also uses a 4096-bit memory bus, and makes use of a 28 nm design. It is comprised of 4096 SPUs, 256 TAUs, and 64 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 Pro Duo		27167 points
Radeon HD 7990		15520 points
	Difference: 11647 (75%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon Pro Duo		350 Watts
Radeon HD 7990		375 Watts
	Difference: 25 Watts (7%)

Memory Bandwidth

As far as performance goes, the Radeon Pro Duo should in theory be a lot superior to the Radeon HD 7990 overall. (explain)

Radeon Pro Duo		1024000 MB/sec
Radeon HD 7990		576000 MB/sec
	Difference: 448000 (78%)

Texel Rate

The Radeon Pro Duo should be much (approximately 111%) faster with regards to texture filtering than the Radeon HD 7990. (explain)

Radeon Pro Duo		512000 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 268800 (111%)

Pixel Rate

The Radeon Pro Duo should be quite a bit (about 111%) more effective at AA than the Radeon HD 7990, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon Pro Duo		128000 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 67200 (111%)

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 (in units of MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.