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Radeon HD 6850 vs Radeon HD 7750


Intro

The Radeon HD 6850 has a GPU clock speed of 775 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1000 MHz through a 256-bit bus. It also is comprised of 960 Stream Processors, 48 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon HD 7750, which uses a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this model. It features 512 SPUs along with 32 Texture Address Units and 16 ROPs.

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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 6850 2395 points
Radeon HD 7750 2240 points
Difference: 155 (7%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 6850 127 Watts
Difference: 72 Watts (131%)

Memory Bandwidth

In theory, the Radeon HD 6850 should be quite a bit faster than the Radeon HD 7750 overall. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 56000 (78%)

Texel Rate

The Radeon HD 6850 is a lot (approximately 45%) better at AF than the Radeon HD 7750. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 11600 (45%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6850 is superior to the Radeon HD 7750, by a large margin. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 12000 (94%)

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

Radeon HD 6850

Radeon HD 7750

Specifications

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Model Radeon HD 6850 Radeon HD 7750
Manufacturer AMD AMD
Year October 2010 February 2012
Code Name Barts Pro Cape Verde Pro
Memory 1024 MB 1024 MB
Core Speed 775 MHz 800 MHz
Memory Speed 4000 MHz 4500 MHz
Power (Max TDP) 127 watts 55 watts
Bandwidth 128000 MB/sec 72000 MB/sec
Texel Rate 37200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 960 512
Texture Mapping Units 48 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 largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card by the core 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount 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 calculated by multiplying the number of ROPs 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Radeon HD 6850

Radeon HD 7750

Comments

3 Responses to “Radeon HD 6850 vs Radeon HD 7750”
Placa Video says:

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Suggest graphics card for my rig....7k ati - Page 2 says:

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