Radeon HD 6770 vs Radeon HD 7850

Intro

Compare those specifications to the Radeon HD 7850, which has clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs as well as 64 Texture Address Units and 32 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 7850		5200 points
Radeon HD 6770		1520 points
	Difference: 3680 (242%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 7850		130 Watts
	Difference: 22 Watts (20%)

Memory Bandwidth

The Radeon HD 7850, in theory, should be much faster than the Radeon HD 6770 in general. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 86400 (129%)

Texel Rate

The Radeon HD 7850 is quite a bit (more or less 53%) faster with regards to texture filtering than the Radeon HD 6770. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 19040 (53%)

Pixel Rate

The Radeon HD 7850 should be a lot (more or less 91%) better at AA than the Radeon HD 6770, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 13120 (91%)

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 (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 texture map elements (texels) that are processed per second. This figure 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.