Radeon HD 6770 1GB vs Radeon HD 6970

Intro

Compare those specifications to the Radeon HD 6970, which makes use of a 40 nm design. AMD has set the core speed at 880 MHz. The GDDR5 RAM is set to run at a speed of 1375 MHz on this model. It features 1536 SPUs along with 96 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon HD 6970		250 Watts
	Difference: 142 Watts (131%)

Memory Bandwidth

The Radeon HD 6970 should theoretically perform quite a bit faster than the Radeon HD 6770 1GB overall. (explain)

Radeon HD 6970		176000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 108800 (162%)

Texel Rate

The Radeon HD 6970 will be a lot (approximately 135%) better at anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon HD 6970		84480 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 48480 (135%)

Pixel Rate

The Radeon HD 6970 will be quite a bit (about 96%) faster with regards to full screen anti-aliasing than the Radeon HD 6770 1GB, and able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6970		28160 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 13760 (96%)

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 data (in units of megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 can be processed per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.