Radeon HD 6750 vs Radeon HD 7870 XT

Intro

Compare those specs to the Radeon HD 7870 XT, which has GPU clock speed of 925 MHz, and 2048 MB of GDDR5 memory running at 1500 MHz through a 256-bit bus. It also features 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 99 Watts (115%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7870 XT should in theory be a lot superior to the Radeon HD 6750 in general. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 128000 (200%)

Texel Rate

The Radeon HD 7870 XT is quite a bit (more or less 240%) faster with regards to AF than the Radeon HD 6750. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 62700 (240%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 XT is a better choice, by far. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 18000 (155%)

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 (measured in MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it must 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 figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.