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Radeon HD 5770 vs Radeon HD 5870


Intro

The Radeon HD 5770 has clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 5870, which comes with GPU clock speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1600(320x5) SPUs, 80 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
Radeon HD 5870 188 Watts
Difference: 80 Watts (74%)

Memory Bandwidth

Theoretically, the Radeon HD 5870 should be quite a bit faster than the Radeon HD 5770 overall. (explain)

Radeon HD 5870 153600 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 76800 (100%)

Texel Rate

The Radeon HD 5870 will be quite a bit (more or less 100%) better at AF than the Radeon HD 5770. (explain)

Radeon HD 5870 68000 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 34000 (100%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 5870 is the winner, and very much so. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 13600 (100%)

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 5870

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 5870
Manufacturer AMD AMD
Year October 13, 2009 September 23, 2009
Code Name Juniper XT Cypress XT
Memory 1024 MB 1024 MB
Core Speed 850 MHz 850 MHz
Memory Speed 4800 MHz 4800 MHz
Power (Max TDP) 108 watts 188 watts
Bandwidth 76800 MB/sec 153600 MB/sec
Texel Rate 34000 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 13600 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 800(160x5) 1600(320x5)
Texture Mapping Units 40 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 2154 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 5770

Amazon.com

Radeon HD 5870

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.

Comments

One Response to “Radeon HD 5770 vs Radeon HD 5870”
ArgentSouL says:

1billon transistors vs 2,1 billons transistor ,mmmh..

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