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Radeon HD 4850 1GB vs Radeon HD 5670

Intro

The Radeon HD 4850 1GB features a GPU core speed of 625 MHz, and the 1024 MB of GDDR4 memory runs at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 5670, which comes with clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 49 Watts (80%)

Memory Bandwidth

Performance-wise, the Radeon HD 5670 should theoretically be a small bit superior to the Radeon HD 4850 1GB overall. (explain)

Radeon HD 5670 64000 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 448 (1%)

Texel Rate

The Radeon HD 4850 1GB is much (more or less 61%) more effective at AF than the Radeon HD 5670. (explain)

Radeon HD 4850 1GB 25000 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 9500 (61%)

Pixel Rate

The Radeon HD 4850 1GB will be a lot (more or less 61%) more effective at FSAA than the Radeon HD 5670, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4850 1GB 10000 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 3800 (61%)

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 1GB

Amazon.com

Check prices at:

Radeon HD 5670

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 1GB Radeon HD 5670
Manufacturer AMD AMD
Year Jun 25, 2008 January 14, 2010
Code Name RV770 PRO Redwood XT
Memory 1024 MB 1024 MB
Core Speed 625 MHz 775 MHz
Memory Speed 1986 MHz 4000 MHz
Power (Max TDP) 110 watts 61 watts
Bandwidth 63552 MB/sec 64000 MB/sec
Texel Rate 25000 Mtexels/sec 15500 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 6200 Mpixels/sec
Unified Shaders 800(160x5) 400(80x5)
Texture Mapping Units 40 20
Render Output Units 16 8
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 627 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4850 1GB

Amazon.com

Check prices at:

Radeon HD 5670

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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