Radeon HD 6750 vs Radeon HD 7870

Intro

Compare those specifications to the Radeon HD 7870, which uses a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this specific card. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon HD 7870		175 Watts
	Difference: 89 Watts (103%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 should be quite a bit faster than the Radeon HD 6750 overall. (explain)

Radeon HD 7870		153600 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 7870 will be much (more or less 207%) better at AF than the Radeon HD 6750. (explain)

Radeon HD 7870		80000 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 53900 (207%)

Pixel Rate

The Radeon HD 7870 is quite a bit (about 176%) faster with regards to full screen anti-aliasing than the Radeon HD 6750, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 20400 (176%)

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 (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.