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Radeon HD 4850 X2 1GB vs Radeon HD 6870

Intro

The Radeon HD 4850 X2 1GB features core speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6870, which features GPU clock speed of 900 MHz, and 1024 MB of GDDR5 RAM set to run at 1050 MHz through a 256-bit bus. It also is made up of 1120 SPUs, 56 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 99 Watts (66%)

Memory Bandwidth

Theoretically, the Radeon HD 6870 should perform just a bit faster than the Radeon HD 4850 X2 1GB in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 4850 X2 1GB 127104 MB/sec
Difference: 7296 (6%)

Texel Rate

The Radeon HD 6870 is just a bit (more or less 1%) more effective at texture filtering than the Radeon HD 4850 X2 1GB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Difference: 400 (1%)

Pixel Rate

The Radeon HD 6870 is quite a bit (about 44%) more effective at FSAA than the Radeon HD 4850 X2 1GB, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Difference: 8800 (44%)

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 6870

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 6870
Manufacturer AMD AMD
Year Nov 7, 2008 October 2010
Code Name R700 Barts XT
Memory 1024 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 900 MHz
Memory Speed 1986 MHz (x2) 4200 MHz
Power (Max TDP) 250 watts 151 watts
Bandwidth 127104 MB/sec 134400 MB/sec
Texel Rate 50000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1120
Texture Mapping Units 40 (x2) 56
Render Output Units 16 (x2) 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably 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 6870

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.

Comments

One Response to “Radeon HD 4850 X2 1GB vs Radeon HD 6870”
consiglio SCHEDA MADRE & PROCESSORE says:

[...] dove potresi reperirla,una 4850x2 va circa e anche meno di una 6870 ( che costa circa 140 €). Radeon HD 4850 X2 1GB vs Radeon HD 6870 – Performance Comparison Benchmarks @ Hardware Compare Phenom II X4 955 BE @ 3.913 Ghz by Thermalright Macho HR-02 -- XFX 6950 1 GB Dual Fan 1000 [...]

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