Radeon HD 6750 1GB vs Radeon HD 7850

Intro

Compare all of that to the Radeon HD 7850, which comes with core speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 7850		130 Watts
	Difference: 44 Watts (51%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7850 should theoretically be a lot better than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 7850 will be quite a bit (about 111%) more effective at AF than the Radeon HD 6750 1GB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 28940 (111%)

Pixel Rate

The Radeon HD 7850 should be a lot (approximately 137%) faster with regards to AA than the Radeon HD 6750 1GB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 15920 (137%)

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 maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, the result 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 ability to get to the max fill rate.