Radeon HD 6770 vs Radeon HD 6790

Intro

Compare that to the Radeon HD 6790, which comes with core clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 TAUs 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

Theoretically speaking, the Radeon HD 6790 will be 100% quicker than the Radeon HD 6770 in general, because of its greater data rate. (explain)

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

Texel Rate

The Radeon HD 6770 will be a little bit (about 7%) more effective at texture filtering than the Radeon HD 6790. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6770 is a better choice, but not by far. (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: Bandwidth is the max amount of data (measured in megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 maximum fill rate.