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Radeon HD 4850 X2 512MB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 4850 X2 512MB has a clock speed of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare that to the Radeon HD 6670 (OEM) 1GB, which comes with GPU clock speed of 800 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is made up of 480 Stream Processors, 24 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 187 Watts (297%)

Memory Bandwidth

The Radeon HD 4850 X2 512MB should theoretically be quite a bit faster than the Radeon HD 6670 (OEM) 1GB in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Difference: 63104 (99%)

Texel Rate

The Radeon HD 4850 X2 512MB is a lot (more or less 160%) better at texture filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 30800 (160%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (approximately 213%) faster with regards to AA than the Radeon HD 6670 (OEM) 1GB, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 13600 (213%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4850 X2 512MB

Amazon.com

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Radeon HD 6670 (OEM) 1GB

Amazon.com

Check prices at:

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 4850 X2 512MB Radeon HD 6670 (OEM) 1GB
Manufacturer AMD AMD
Year Nov 7, 2008 February 2011
Code Name R700 Turks
Memory 512 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 800 MHz
Memory Speed 1986 MHz (x2) 4000 MHz
Power (Max TDP) 250 watts 63 watts
Bandwidth 127104 MB/sec 64000 MB/sec
Texel Rate 50000 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 800(160x5) (x2) 480
Texture Mapping Units 40 (x2) 24
Render Output Units 16 (x2) 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 715 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM) 1GB

Amazon.com

Check prices at:

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.

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