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Radeon HD 4850 2GB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 4850 2GB features a clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this specific model. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
Radeon HD 4850 2GB 110 Watts
Difference: 47 Watts (75%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) 1GB should perform a bit faster than the Radeon HD 4850 2GB in general. (explain)

Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 448 (1%)

Texel Rate

The Radeon HD 4850 2GB will be much (about 30%) more effective at texture filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 4850 2GB 25000 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 5800 (30%)

Pixel Rate

The Radeon HD 4850 2GB is a lot (more or less 56%) better at FSAA than the Radeon HD 6670 (OEM) 1GB, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4850 2GB 10000 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 3600 (56%)

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 4850 2GB

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 2GB Radeon HD 6670 (OEM) 1GB
Manufacturer AMD AMD
Year Jun 25, 2008 February 2011
Code Name RV770 PRO Turks
Memory 2048 MB 1024 MB
Core Speed 625 MHz 800 MHz
Memory Speed 1986 MHz 4000 MHz
Power (Max TDP) 110 watts 63 watts
Bandwidth 63552 MB/sec 64000 MB/sec
Texel Rate 25000 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 800(160x5) 480
Texture Mapping Units 40 24
Render Output Units 16 8
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 715 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it must 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at 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 the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock 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 fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4850 2GB

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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