Radeon HD 6850 vs Radeon HD 7790

Intro

Compare all of that to the Radeon HD 7790, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory works at a speed of 1500 MHz on this model. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator 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 6850		2395 points
	Difference: 1935 (81%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 6850		127 Watts
	Difference: 42 Watts (49%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6850 should be a lot faster than the Radeon HD 7790 in general. (explain)

Radeon HD 6850		128000 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 32000 (33%)

Texel Rate

The Radeon HD 7790 will be much (approximately 51%) better at anisotropic filtering than the Radeon HD 6850. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 6850		37200 Mtexels/sec
	Difference: 18800 (51%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6850 is the winner, by a large margin. (explain)

Radeon HD 6850		24800 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 8800 (55%)

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 maximum amount of data (measured in megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling 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 the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.