Radeon HD 6770 vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which has clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 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 6790		2150 points
Radeon HD 6770		1520 points
	Difference: 630 (41%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 6790		150 Watts
	Difference: 42 Watts (39%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6790 should in theory be quite a bit superior to the Radeon HD 6770 in general. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 67200 (100%)

Texel Rate

The Radeon HD 6770 is a bit (more or less 7%) better at AF than the Radeon HD 6790. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 2400 (7%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6770 is superior to the Radeon HD 6790, not by a very large margin though. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 960 (7%)

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 data (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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