Radeon HD 6770 vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is made up of 896 SPUs, 56 Texture Address Units, and 16 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 7790		4330 points
Radeon HD 6770		1520 points
	Difference: 2810 (185%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 6770		108 Watts
	Difference: 23 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 7790 should perform quite a bit faster than the Radeon HD 6770 in general. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 28800 (43%)

Texel Rate

The Radeon HD 7790 will be much (approximately 56%) more effective at AF than the Radeon HD 6770. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 20000 (56%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7790 is a better choice, not by a very large margin though. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 1600 (11%)

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: Bandwidth is the max amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.