Radeon HD 6770 vs Radeon HD 7850

Intro

Compare that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core speed at 860 MHz. The GDDR5 memory is set to run at a frequency of 1200 MHz on this model. It features 1024 SPUs along with 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

Performance-wise, the Radeon HD 7850 should theoretically be much superior to the Radeon HD 6770 overall. (explain)

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

Texel Rate

The Radeon HD 7850 is much (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 will be a lot (more or less 91%) faster with regards to FSAA than the Radeon HD 6770, and also will be capable of handling higher screen resolutions while still performing well. (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 max amount of data (measured in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.