Radeon HD 7990 vs Radeon R9 295X2

Intro

Compare that to the Radeon R9 295X2, which uses a 28 nm design. AMD has set the core speed at 1018 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this particular model. It features 2816 SPUs along with 176 TAUs and 64 ROPs.

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 R9 295X2		21205 points
Radeon HD 7990		15520 points
	Difference: 5685 (37%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7990		375 Watts
Radeon R9 295X2		500 Watts
	Difference: 125 Watts (33%)

Memory Bandwidth

As far as performance goes, the Radeon R9 295X2 should theoretically be a bit better than the Radeon HD 7990 in general. (explain)

Radeon R9 295X2		640000 MB/sec
Radeon HD 7990		576000 MB/sec
	Difference: 64000 (11%)

Texel Rate

The Radeon R9 295X2 is a lot (more or less 47%) faster with regards to texture filtering than the Radeon HD 7990. (explain)

Radeon R9 295X2		358336 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 115136 (47%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 295X2 is the winner, by far. (explain)

Radeon R9 295X2		130304 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 69504 (114%)

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 maximum amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that can be processed 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.