Radeon HD 6770 vs Radeon HD 6870

Intro

Compare those specs to the Radeon HD 6870, which uses a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this model. It features 1120 SPUs as well as 56 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 6870		2870 points
Radeon HD 6770		1520 points
	Difference: 1350 (89%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 6870		151 Watts
	Difference: 43 Watts (40%)

Memory Bandwidth

Performance-wise, the Radeon HD 6870 should in theory be much superior to the Radeon HD 6770 in general. (explain)

Radeon HD 6870		134400 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 67200 (100%)

Texel Rate

The Radeon HD 6870 should be a lot (about 40%) better at anisotropic filtering than the Radeon HD 6770. (explain)

Radeon HD 6870		50400 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 14400 (40%)

Pixel Rate

The Radeon HD 6870 is much (approximately 100%) faster with regards to full screen anti-aliasing than the Radeon HD 6770, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 14400 (100%)

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 largest amount of information (measured in MB per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.