Radeon HD 7990 vs Radeon R9 295X2

Intro

Compare those specifications to the Radeon R9 295X2, which makes use of a 28 nm design. AMD has clocked the core frequency at 1018 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this particular model. It features 2816 SPUs as well as 176 TAUs and 64 Rasterization Operator Units.

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 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

In theory, the Radeon R9 295X2 is 11% quicker than the Radeon HD 7990 overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon R9 295X2 should be much (more or less 47%) better at AF than the Radeon HD 7990. (explain)

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

Pixel Rate

The Radeon R9 295X2 should be much (more or less 114%) more effective at FSAA than the Radeon HD 7990, and will be capable of handling higher resolutions while still performing well. (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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, 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 maximum number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.