Radeon HD 7990 vs Radeon R9 380 4G

Intro

Compare all of that to the Radeon R9 380 4G, which has a GPU core clock speed of 970 MHz, and 4096 MB of GDDR5 memory running at 1425 MHz through a 256-bit bus. It also features 1792 Stream Processors, 112 TAUs, and 32 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 380 4G		8837 points
	Difference: 6683 (76%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 380 4G		21 Mh/s
	Difference: 11 (52%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 4G		190 Watts
Radeon HD 7990		375 Watts
	Difference: 185 Watts (97%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should in theory be quite a bit better than the Radeon R9 380 4G overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 380 4G		182400 MB/sec
	Difference: 393600 (216%)

Texel Rate

The Radeon HD 7990 is much (approximately 124%) faster with regards to AF than the Radeon R9 380 4G. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 380 4G		108640 Mtexels/sec
	Difference: 134560 (124%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7990 is superior to the Radeon R9 380 4G, and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 380 4G		31040 Mpixels/sec
	Difference: 29760 (96%)

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 data (in units of MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 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 amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 ROPs by the the core clock speed. 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.