Radeon HD 6770 vs Radeon HD 7870 XT

Intro

Compare those specs to the Radeon HD 7870 XT, which features a clock frequency of 925 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It features 1536 SPUs, 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

As far as performance goes, the Radeon HD 7870 XT should in theory be much superior to the Radeon HD 6770 overall. (explain)

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

Texel Rate

The Radeon HD 7870 XT should be a lot (about 147%) faster with regards to anisotropic 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 high levels of AA 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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 in one second. This figure is worked out by multiplying the total number of texture units by the core clock 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 maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.