Radeon HD 5750 512MB vs Radeon HD 6750

Intro

Compare all that to the Radeon HD 6750, which comes with GPU core speed of 725 MHz, and 512 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is made up of 720 Stream Processors, 36 Texture Address Units, and 16 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 5750 512MB is 15% faster than the Radeon HD 6750 in general, because of its higher bandwidth. (explain)

Radeon HD 5750 512MB		73600 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 9600 (15%)

Texel Rate

The Radeon HD 6750 should be a bit (more or less 4%) more effective at texture filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 900 (4%)

Pixel Rate

The Radeon HD 6750 is just a bit (approximately 4%) faster with regards to anti-aliasing than the Radeon HD 5750 512MB, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6750		11600 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 400 (4%)

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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the card will be at 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 record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.