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Radeon HD 5670 vs Radeon HD 7770

Intro

The Radeon HD 5670 features a clock speed of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It is made up of 400(80x5) SPUs, 20 Texture Address Units, and 8 ROPs.

Compare those specs to the Radeon HD 7770, which features a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features 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.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
Radeon HD 7770 80 Watts
Difference: 19 Watts (31%)

Memory Bandwidth

The Radeon HD 7770, in theory, should perform a bit faster than the Radeon HD 5670 in general. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 7770 is quite a bit (more or less 158%) better at anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 24500 (158%)

Pixel Rate

The Radeon HD 7770 is a lot (approximately 158%) faster with regards to anti-aliasing than the Radeon HD 5670, and also will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 9800 (158%)

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 5670

Radeon HD 7770

Specifications

Display Specifications

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Model Radeon HD 5670 Radeon HD 7770
Manufacturer AMD AMD
Year January 14, 2010 February 2012
Code Name Redwood XT Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 775 MHz 1000 MHz
Memory Speed 4000 MHz 4500 MHz
Power (Max TDP) 61 watts 80 watts
Bandwidth 64000 MB/sec 72000 MB/sec
Texel Rate 15500 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 6200 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 400(80x5) 640
Texture Mapping Units 20 40
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 627 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: Bandwidth is the maximum amount of information (in units of MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Radeon HD 5670

Radeon HD 7770

Comments

One Response to “Radeon HD 5670 vs Radeon HD 7770”
PC computer guru needed for purchase/info - SVTPerformance says:

[...] improvement between these cards will yield over double. Radeon HD 5670 vs Radeon HD 7770 – Performance Comparison Benchmarks @ Hardware Compare However a 7770 is not maxing out BF3, sorry. Here is the card I use that maxes out BF3: GeForce [...]

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