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Radeon HD 6750 1GB vs Radeon HD 7870

Intro

The Radeon HD 6750 1GB comes with a clock speed of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 720 SPUs, 36 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 7870, which comes with a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It is comprised of 1280 SPUs, 80 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB 86 Watts
Radeon HD 7870 175 Watts
Difference: 89 Watts (103%)

Memory Bandwidth

The Radeon HD 7870 should in theory be much faster than the Radeon HD 6750 1GB in general. (explain)

Radeon HD 7870 153600 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 89600 (140%)

Texel Rate

The Radeon HD 7870 will be quite a bit (more or less 207%) better at texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 6750 1GB 26100 Mtexels/sec
Difference: 53900 (207%)

Pixel Rate

The Radeon HD 7870 is much (more or less 176%) better at anti-aliasing than the Radeon HD 6750 1GB, and also will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 6750 1GB 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

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Radeon HD 6750 1GB

Amazon.com

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Radeon HD 7870

Amazon.com

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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 6750 1GB Radeon HD 7870
Manufacturer AMD AMD
Year January 2011 March 2012
Code Name Juniper Pro Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 725 MHz 1000 MHz
Memory Speed 4000 MHz 4800 MHz
Power (Max TDP) 86 watts 175 watts
Bandwidth 64000 MB/sec 153600 MB/sec
Texel Rate 26100 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 11600 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 720 1280
Texture Mapping Units 36 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1040 million 2800 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 (counted in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If 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 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 clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 6750 1GB

Amazon.com

Check prices at:

Radeon HD 7870

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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