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Radeon HD 6670 (OEM) 1GB vs Radeon HD 7770


Intro

The Radeon HD 6670 (OEM) 1GB comes with a GPU core clock speed of 800 MHz, and the 1024 MB of GDDR5 memory is set to run at 1000 MHz through a 128-bit bus. It also is comprised of 480 Stream Processors, 24 TAUs, and 8 ROPs.

Compare those specs to the Radeon HD 7770, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this specific card. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
Radeon HD 7770 80 Watts
Difference: 17 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 7770 should be a little bit faster than the Radeon HD 6670 (OEM) 1GB overall. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 7770 is quite a bit (more or less 108%) faster with regards to anisotropic filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 20800 (108%)

Pixel Rate

The Radeon HD 7770 should be a lot (approximately 150%) faster with regards to AA than the Radeon HD 6670 (OEM) 1GB, and also will be capable of handling higher resolutions better. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 9600 (150%)

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 6670 (OEM) 1GB

Radeon HD 7770

Specifications

Display Specifications

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Model Radeon HD 6670 (OEM) 1GB Radeon HD 7770
Manufacturer AMD AMD
Year February 2011 February 2012
Code Name Turks Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 800 MHz 1000 MHz
Memory Speed 4000 MHz 4500 MHz
Power (Max TDP) 63 watts 80 watts
Bandwidth 64000 MB/sec 72000 MB/sec
Texel Rate 19200 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 6400 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 480 640
Texture Mapping Units 24 40
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 715 million 1500 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number 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 rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Radeon HD 6670 (OEM) 1GB

Radeon HD 7770

Comments

One Response to “Radeon HD 6670 (OEM) 1GB vs Radeon HD 7770”
hammad says:

which is the best

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