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Radeon HD 5770 vs Radeon HD 6850

Intro

The Radeon HD 5770 has a core clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6850, which comes with a clock frequency of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is made up of 960 SPUs, 48 Texture Address Units, and 32 Raster Operation Units.

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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

Theoretically speaking, the Radeon HD 6850 is 67% quicker than the Radeon HD 5770 in general, due to its greater data rate. (explain)

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

Texel Rate

The Radeon HD 6850 will be a bit (about 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

If running with a high screen resolution is important to you, then the Radeon HD 6850 is superior to the Radeon HD 5770, by a large margin. (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

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Radeon HD 5770

Amazon.com

Radeon HD 6850

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

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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 largest amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant 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

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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