Radeon HD 6790 vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 Texture Address Units, and 16 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 7790		4330 points
Radeon HD 6790		2150 points
	Difference: 2180 (101%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 6790		150 Watts
	Difference: 65 Watts (76%)

Memory Bandwidth

Theoretically, the Radeon HD 6790 should be much faster than the Radeon HD 7790 overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 38400 (40%)

Texel Rate

The Radeon HD 7790 is quite a bit (about 67%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 22400 (67%)

Pixel Rate

The Radeon HD 7790 should be a bit (about 19%) better at AA than the Radeon HD 6790, and able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 2560 (19%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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