Radeon HD 7990 vs Radeon R9 270X

Intro

Compare those specs to the Radeon R9 270X, which features a clock speed of 1000 MHz and a GDDR5 memory frequency of 1400 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1280 SPUs, 80 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 270X		6590 points
	Difference: 8930 (136%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 270X		18 Mh/s
	Difference: 14 (78%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 270X		177 Sol/s
	Difference: 336 (190%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X		180 Watts
Radeon HD 7990		375 Watts
	Difference: 195 Watts (108%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should theoretically be a lot superior to the Radeon R9 270X in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 270X		179200 MB/sec
	Difference: 396800 (221%)

Texel Rate

The Radeon HD 7990 will be much (approximately 204%) better at texture filtering than the Radeon R9 270X. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 270X		80000 Mtexels/sec
	Difference: 163200 (204%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is superior to the Radeon R9 270X, and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 270X		32000 Mpixels/sec
	Difference: 28800 (90%)

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 largest amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 are applied in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 graphics card can possibly write to the 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.