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Radeon HD 4850 X2 1GB vs Radeon HD 4870 2GB

Intro

The Radeon HD 4850 X2 1GB uses a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 memory works at a speed of 993 MHz on this card. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4870 2GB, which has a core clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It 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 1GB 250 Watts
Difference: 100 Watts (67%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB should be a little bit faster than the Radeon HD 4870 2GB overall. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 11904 (10%)

Texel Rate

The Radeon HD 4850 X2 1GB will be quite a bit (more or less 67%) more effective at AF than the Radeon HD 4870 2GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 20000 (67%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4850 X2 1GB is superior to the Radeon HD 4870 2GB, by a large margin. (explain)

Radeon HD 4850 X2 1GB 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 1GB

Amazon.com

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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 1GB Radeon HD 4870 2GB
Manufacturer AMD AMD
Year Nov 7, 2008 Jun 25, 2008
Code Name R700 RV770 XT
Memory 1024 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: Bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher 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 one second.

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

Display Prices

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Radeon HD 4850 X2 1GB

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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