Radeon HD 6990 vs Radeon R9 295X2

Intro

Compare all of that to the Radeon R9 295X2, which comes with GPU clock speed of 1018 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 512-bit bus. It also is made up of 2816 Stream Processors, 176 Texture Address Units, 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 6990		5820 points
	Difference: 15385 (264%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6990		375 Watts
Radeon R9 295X2		500 Watts
	Difference: 125 Watts (33%)

Memory Bandwidth

In theory, the Radeon R9 295X2 is 100% quicker than the Radeon HD 6990 overall, due to its higher data rate. (explain)

Radeon R9 295X2		640000 MB/sec
Radeon HD 6990		320000 MB/sec
	Difference: 320000 (100%)

Texel Rate

The Radeon R9 295X2 will be much (about 125%) better at AF than the Radeon HD 6990. (explain)

Radeon R9 295X2		358336 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 198976 (125%)

Pixel Rate

The Radeon R9 295X2 should be quite a bit (approximately 145%) more effective at FSAA than the Radeon HD 6990, and capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 295X2		130304 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 77184 (145%)

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 maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.