Radeon HD 7990 vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which comes with a GPU core clock speed of 1000 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 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 HD 7990		15520 points
Radeon R9 390 8G		12733 points
	Difference: 2787 (22%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 390 8G		28 Mh/s
	Difference: 4 (14%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 390 8G		326 Sol/s
	Difference: 187 (57%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 390 8G		275 Watts
Radeon HD 7990		375 Watts
	Difference: 100 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be a lot faster than the Radeon R9 390 8G overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 390 8G		384000 MB/sec
	Difference: 192000 (50%)

Texel Rate

The Radeon HD 7990 is quite a bit (approximately 52%) more effective at AF than the Radeon R9 390 8G. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 390 8G		160000 Mtexels/sec
	Difference: 83200 (52%)

Pixel Rate

The Radeon R9 390 8G is a little bit (approximately 5%) more effective at full screen anti-aliasing than the Radeon HD 7990, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon R9 390 8G		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 max amount of information (measured in megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number 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 the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.