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Radeon HD 6750 vs Radeon HD 7750

Intro

The Radeon HD 6750 comes with a GPU clock speed of 725 MHz, and the 512 MB of GDDR5 RAM is set to run at 1000 MHz through a 128-bit bus. It also is comprised of 720 Stream Processors, 36 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7750, which comes with a clock frequency of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is comprised of 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 6750 86 Watts
Difference: 31 Watts (56%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 should be a little bit faster than the Radeon HD 6750 in general. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 6750 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 6750 will be a small bit (more or less 2%) better at AF than the Radeon HD 7750. (explain)

Radeon HD 6750 26100 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 500 (2%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7750 is a better choice, though only just barely. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 6750 11600 Mpixels/sec
Difference: 1200 (10%)

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

Display Prices

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Radeon HD 6750

Amazon.com

Radeon HD 7750

Amazon.com

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

Display Specifications

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Model Radeon HD 6750 Radeon HD 7750
Manufacturer AMD AMD
Year January 2011 February 2012
Code Name Juniper Pro Cape Verde Pro
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 512 MB 1024 MB
Core Speed 725 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4000 MHz 4500 MHz
Unified Shaders 720 512
Texture Mapping Units 36 32
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.0 OpenGL 4.2
Power (Max TDP) 86 watts 55 watts
Shader Model 5.0 5.0
Bandwidth 64000 MB/sec 72000 MB/sec
Texel Rate 26100 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 11600 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better 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 amount of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Comments

One Response to “Radeon HD 6750 vs Radeon HD 7750”
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