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Radeon HD 4850 X2 512MB vs Radeon HD 4870 2GB

Intro

The Radeon HD 4850 X2 512MB uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 memory runs at a frequency of 993 MHz on this specific card. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Compare all that to the Radeon HD 4870 2GB, which has GPU core speed of 750 MHz, and 2048 MB of GDDR5 memory running at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 100 Watts (67%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB should be 10% faster than the Radeon HD 4870 2GB overall, due to its higher bandwidth. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 11904 (10%)

Texel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (more or less 67%) faster with regards to AF than the Radeon HD 4870 2GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 20000 (67%)

Pixel Rate

The Radeon HD 4850 X2 512MB should be quite a bit (more or less 67%) better at AA than the Radeon HD 4870 2GB, and able to handle higher resolutions more effectively. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 8000 (67%)

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

Check prices at:

Radeon HD 4870 2GB

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 4870 2GB
Manufacturer AMD AMD
Year Nov 7, 2008 Jun 25, 2008
Code Name R700 RV770 XT
Memory 512 MB (x2) 2048 MB
Core Speed 625 MHz (x2) 750 MHz
Memory Speed 1986 MHz (x2) 3600 MHz
Power (Max TDP) 250 watts 150 watts
Bandwidth 127104 MB/sec 115200 MB/sec
Texel Rate 50000 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800(160x5)
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 55 nm
Transistors 956 million 956 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 applied in one second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video 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 colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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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