Radeon HD 6990 vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which comes with core speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 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 HD 7990		15520 points
Radeon HD 6990		5820 points
	Difference: 9700 (167%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 8 (33%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 will be 80% quicker than the Radeon HD 6990 overall, because of its greater bandwidth. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 6990		320000 MB/sec
	Difference: 256000 (80%)

Texel Rate

The Radeon HD 7990 should be much (approximately 53%) more effective at texture filtering than the Radeon HD 6990. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 83840 (53%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7990 is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 7680 (14%)

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 data (measured in MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total number of texture units of the card by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.