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Radeon HD 5870 vs Radeon HD 7770

Intro

The Radeon HD 5870 makes use of a 40 nm design. AMD has clocked the core frequency at 850 MHz. The GDDR5 RAM runs at a speed of 1200 MHz on this model. It features 1600(320x5) SPUs along with 80 Texture Address Units and 32 ROPs.

Compare those specs to the Radeon HD 7770, which features a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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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

In theory, the Radeon HD 5870 will be 113% faster than the Radeon HD 7770 overall, due to its greater data rate. (explain)

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

Texel Rate

The Radeon HD 5870 will be a lot (about 70%) better at 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

The Radeon HD 5870 will be a lot (approximately 70%) faster with regards to anti-aliasing than the Radeon HD 7770, and also capable of handling higher resolutions more effectively. (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

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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

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Model Radeon HD 5870 Radeon HD 7770
Manufacturer AMD AMD
Year September 23, 2009 February 2012
Code Name Cypress XT Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 850 MHz 1000 MHz
Memory Speed 4800 MHz 4500 MHz
Power (Max TDP) 188 watts 80 watts
Bandwidth 153600 MB/sec 72000 MB/sec
Texel Rate 68000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 16000 Mpixels/sec
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
Fab Process 40 nm 28 nm
Transistors 2154 million 1500 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, 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 amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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 ability to get to the maximum fill rate.

Comments

One Response to “Radeon HD 5870 vs Radeon HD 7770”
Kyle Kelley says:

This shit makes no sense at all. Please explain.

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