Radeon HD 6770 vs Radeon HD 7870 XT

Intro

Compare all of that to the Radeon HD 7870 XT, which makes use of a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this specific model. It features 1536 SPUs as well as 96 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 7870 XT		6390 points
Radeon HD 6770		1520 points
	Difference: 4870 (320%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 77 Watts (71%)

Memory Bandwidth

In theory, the Radeon HD 7870 XT is 186% faster than the Radeon HD 6770 overall, because of its greater bandwidth. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 124800 (186%)

Texel Rate

The Radeon HD 7870 XT is much (more or less 147%) better at texture filtering than the Radeon HD 6770. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 52800 (147%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7870 XT is superior to the Radeon HD 6770, by a large margin. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 15200 (106%)

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 megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 amount of 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 the texel rate, the better the video 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 write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.