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Radeon HD 5670 vs Radeon HD 7770

Intro

The Radeon HD 5670 uses a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 memory runs at a speed of 1000 MHz on this card. It features 400(80x5) SPUs along with 20 Texture Address Units and 8 ROPs.

Compare all of that to the Radeon HD 7770, which comes with GPU core speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

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

In theory, the Radeon HD 7770 is 13% quicker than the Radeon HD 5670 in general, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 7770 should be a lot (about 158%) more effective at AF than the Radeon HD 5670. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7770 is a better choice, by a large margin. (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

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Radeon HD 5670

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 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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 are applied in one second. This 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that 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 - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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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