Radeon HD 7990 vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which has GPU clock speed of 1050 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2816 Stream Processors, 176 Texture Address Units, and 64 ROPs.

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 390X 8G		13555 points
	Difference: 1965 (14%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 390X 8G		32 Mh/s
	Difference: 0 (0%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 390X 8G		330 Sol/s
	Difference: 183 (55%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

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

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

Texel Rate

The Radeon HD 7990 is much (about 32%) faster with regards to AF than the Radeon R9 390X 8G. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 390X 8G		184800 Mtexels/sec
	Difference: 58400 (32%)

Pixel Rate

The Radeon R9 390X 8G is a bit (more or less 11%) faster with regards to FSAA than the Radeon HD 7990, and also able to handle higher screen resolutions more effectively. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 6400 (11%)

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 (counted in megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling 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 that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.