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Radeon HD 5770 vs Radeon HD 6850


Intro

The Radeon HD 5770 comes with core clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 6850, which features a clock frequency of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 960 SPUs, 48 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
Radeon HD 6850 127 Watts
Difference: 19 Watts (18%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6850 should theoretically be quite a bit better than the Radeon HD 5770 overall. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 51200 (67%)

Texel Rate

The Radeon HD 6850 is a small bit (more or less 9%) more effective at AF than the Radeon HD 5770. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 3200 (9%)

Pixel Rate

The Radeon HD 6850 will be much (about 82%) better at full screen anti-aliasing than the Radeon HD 5770, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 11200 (82%)

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 5770

Radeon HD 6850

Specifications

Display Specifications

Hide Specifications

Model Radeon HD 5770 Radeon HD 6850
Manufacturer AMD AMD
Year October 13, 2009 October 2010
Code Name Juniper XT Barts Pro
Memory 1024 MB 1024 MB
Core Speed 850 MHz 775 MHz
Memory Speed 4800 MHz 4000 MHz
Power (Max TDP) 108 watts 127 watts
Bandwidth 76800 MB/sec 128000 MB/sec
Texel Rate 34000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 13600 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 800(160x5) 960
Texture Mapping Units 40 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 1700 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Radeon HD 5770

Radeon HD 6850

Comments

5 Responses to “Radeon HD 5770 vs Radeon HD 6850”
William says:

Very helpful review..concise, informative and clear. I like the hot-links so you can examine technical issues in more detail. All in all, well done guys xD

PowerColor bald mit passiver Radeon HD 6850 - Forum de Luxx says:

[...] [...]

Giudizio configurazione pc - Pagina 2 - Forum di Tom's Hardware says:

[...] [...]

pouya says:

5770 2g ddr3 (crossfire) vs 6850 1g ddr5?

MIke says:

Great archival review. I was going to get a 5770 based on a 500watt power supply and I purchased a 6850 because I realized I had access to a 650watt power supply and this review confirmed my hopes that the 6850 is significantly faster!

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