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Radeon HD 6870 vs Radeon HD 7750

Intro

The Radeon HD 6870 has a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1120 SPUs, 56 TAUs, and 32 Raster Operation Units.

Compare all that to the Radeon HD 7750, which has a core clock frequency of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It features 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6870 2870 points
Radeon HD 7750 2240 points
Difference: 630 (28%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 6870 151 Watts
Difference: 96 Watts (175%)

Memory Bandwidth

Theoretically, the Radeon HD 6870 should be a lot faster than the Radeon HD 7750 in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 62400 (87%)

Texel Rate

The Radeon HD 6870 should be much (about 97%) more effective at anisotropic filtering than the Radeon HD 7750. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 24800 (97%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6870 is a better choice, by a large margin. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 16000 (125%)

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

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Radeon HD 6870

Amazon.com

Check prices at:

Radeon HD 7750

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 6870 Radeon HD 7750
Manufacturer AMD AMD
Year October 2010 February 2012
Code Name Barts XT Cape Verde Pro
Memory 1024 MB 1024 MB
Core Speed 900 MHz 800 MHz
Memory Speed 4200 MHz 4500 MHz
Power (Max TDP) 151 watts 55 watts
Bandwidth 134400 MB/sec 72000 MB/sec
Texel Rate 50400 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 1120 512
Texture Mapping Units 56 32
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 1500 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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

Display Prices

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Radeon HD 6870

Amazon.com

Check prices at:

Radeon HD 7750

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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