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Radeon HD 5870 vs Radeon HD 7770

Intro

The Radeon HD 5870 comes with a clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1600(320x5) SPUs, 80 TAUs, and 32 Raster Operation Units.

Compare all that to the Radeon HD 7770, which comes with a core clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 5870 188 Watts
Difference: 108 Watts (135%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5870 should be quite a bit faster than the Radeon HD 7770 overall. (explain)

Radeon HD 5870 153600 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 81600 (113%)

Texel Rate

The Radeon HD 5870 is much (about 70%) faster with regards to anisotropic filtering than the Radeon HD 7770. (explain)

Radeon HD 5870 68000 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 28000 (70%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5870 is a better choice, by far. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 11200 (70%)

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 5870

Amazon.com

Radeon HD 7770

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 5870 Radeon HD 7770
Manufacturer AMD AMD
Year September 23, 2009 February 2012
Code Name Cypress XT Cape Verde XT
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 850 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 1600(320x5) 640
Texture Mapping Units 80 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2
Power (Max TDP) 188 watts 80 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 72000 MB/sec
Texel Rate 68000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at 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 that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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