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Radeon HD 5670 vs Radeon HD 7770

Intro

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

Compare those specs to the Radeon HD 7770, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 TAUs, and 16 ROPs.

(No game benchmarks for this combination yet.)

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 will be 13% quicker than the Radeon HD 5670 in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7770 is much (about 158%) faster with regards to AF 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 should be a lot (approximately 158%) more effective at AA than the Radeon HD 5670, and will be able to handle higher screen 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

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 5670 Radeon HD 7770
Manufacturer AMD AMD
Year January 14, 2010 February 2012
Code Name Redwood 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 775 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1000 MHz (4000 MHz effective) 1125 MHz (4500 MHz effective)
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
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2
Power (Max TDP) 61 watts 80 watts
Shader Model 5.0 5.0
Bandwidth 64000 MB/sec 72000 MB/sec
Texel Rate 15500 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 6200 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could 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 Render Output Units 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 fill rate is also dependant on lots of other factors, especially 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”
[...] 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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