Radeon HD 7990 vs Radeon R9 270

Intro

Compare that to the Radeon R9 270, which comes with a GPU core clock speed of 900 MHz, and 2048 MB of GDDR5 RAM running at 1400 MHz through a 256-bit bus. It also is comprised of 1280 SPUs, 80 Texture Address Units, 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 270		5943 points
	Difference: 9577 (161%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 270		15 Mh/s
	Difference: 17 (113%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270		150 Watts
Radeon HD 7990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

In theory, the Radeon HD 7990 is 221% quicker than the Radeon R9 270 in general, due to its higher data rate. (explain)

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

Texel Rate

The Radeon HD 7990 should be a lot (approximately 238%) faster with regards to texture filtering than the Radeon R9 270. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 270		72000 Mtexels/sec
	Difference: 171200 (238%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (approximately 111%) better at full screen anti-aliasing than the Radeon R9 270, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 270		28800 Mpixels/sec
	Difference: 32000 (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 largest amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most 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 number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.