Radeon HD 6770 1GB vs Radeon HD 7870

Intro

Compare those specifications to the Radeon HD 7870, which has core clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon HD 7870		175 Watts
	Difference: 67 Watts (62%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 will be 129% faster than the Radeon HD 6770 1GB in general, because of its greater data rate. (explain)

Radeon HD 7870		153600 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 86400 (129%)

Texel Rate

The Radeon HD 7870 is much (more or less 122%) more effective at texture filtering than the Radeon HD 6770 1GB. (explain)

Radeon HD 7870		80000 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 44000 (122%)

Pixel Rate

The Radeon HD 7870 should be quite a bit (more or less 122%) faster with regards to FSAA than the Radeon HD 6770 1GB, and able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 17600 (122%)

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 largest amount of information (measured in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus 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 memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.