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Radeon HD 4850 X2 1GB vs Radeon HD 4870 X2

Intro

The Radeon HD 4850 X2 1GB has core speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 4870 X2, which comes with a GPU core clock speed of 750 MHz, and 1024 MB of GDDR5 memory set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 X2 1GB 250 Watts
Radeon HD 4870 X2 350 Watts
Difference: 100 Watts (40%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 should be much faster than the Radeon HD 4850 X2 1GB overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 4850 X2 1GB 127104 MB/sec
Difference: 103296 (81%)

Texel Rate

The Radeon HD 4870 X2 will be a small bit (approximately 20%) better at anisotropic filtering than the Radeon HD 4850 X2 1GB. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Difference: 10000 (20%)

Pixel Rate

The Radeon HD 4870 X2 should be a little bit (approximately 20%) more effective at full screen anti-aliasing than the Radeon HD 4850 X2 1GB, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Difference: 4000 (20%)

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 1GB

Amazon.com

Check prices at:

Radeon HD 4870 X2

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 1GB Radeon HD 4870 X2
Manufacturer AMD AMD
Year Nov 7, 2008 Aug 12, 2008
Code Name R700 R700
Memory 1024 MB (x2) 1024 MB (x2)
Core Speed 625 MHz (x2) 750 MHz (x2)
Memory Speed 1986 MHz (x2) 3600 MHz (x2)
Power (Max TDP) 250 watts 350 watts
Bandwidth 127104 MB/sec 230400 MB/sec
Texel Rate 50000 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800(160x5) (x2)
Texture Mapping Units 40 (x2) 40 (x2)
Render Output Units 16 (x2) 16 (x2)
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 956 million 956 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 1GB

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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