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Radeon HD 5770 vs Radeon HD 6850

Intro

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

Compare all that to the Radeon HD 6850, which features clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 960 SPUs along with 48 Texture Address Units and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

The Radeon HD 6850 should in theory perform much faster than the Radeon HD 5770 in general. (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%) faster with regards to texture filtering 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 resolution is important to you, then the Radeon HD 6850 is superior to the Radeon HD 5770, and very much so. (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

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

Model Radeon HD 5770 Radeon HD 6850
Manufacturer AMD AMD
Year October 13, 2009 October 2010
Code Name Juniper XT Barts Pro
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe x16
Memory 1024 MB 1024 MB
Core Speed 850 MHz 775 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1000 MHz (4000 MHz effective)
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
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1
Power (Max TDP) 108 watts 127 watts
Shader Model 5.0 5.0
Bandwidth 76800 MB/sec 128000 MB/sec
Texel Rate 34000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 13600 Mpixels/sec 24800 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video 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 graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. 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 also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential 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
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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