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Radeon HD 4870 X2 vs Radeon HD 5870

Intro

The Radeon HD 4870 X2 features a GPU core clock speed of 750 MHz, and the 1024 MB of GDDR5 memory is 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.

Compare all of that to the Radeon HD 5870, which has GPU core speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also is made up of 1600(320x5) Stream Processors, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Radeon HD 4870 X2 350 Watts
Difference: 162 Watts (86%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 should be much faster than the Radeon HD 5870 overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 76800 (50%)

Texel Rate

The Radeon HD 5870 will be just a bit (approximately 13%) faster with regards to texture filtering than the Radeon HD 4870 X2. (explain)

Radeon HD 5870 68000 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 8000 (13%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 5870 is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 3200 (13%)

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 4870 X2

Amazon.com

Radeon HD 5870

Amazon.com

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 4870 X2 Radeon HD 5870
Manufacturer AMD AMD
Year Aug 12, 2008 September 23, 2009
Code Name R700 Cypress XT
Memory 1024 MB (x2) 1024 MB
Core Speed 750 MHz (x2) 850 MHz
Memory Speed 3600 MHz (x2) 4800 MHz
Power (Max TDP) 350 watts 188 watts
Bandwidth 230400 MB/sec 153600 MB/sec
Texel Rate 60000 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1600(320x5)
Texture Mapping Units 40 (x2) 80
Render Output Units 16 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 2154 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. The number 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 it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Comments

2 Responses to “Radeon HD 4870 X2 vs Radeon HD 5870”
HD4870x2, HD5770 Hawk & 8400GS LP - Page 4 says:

[...] Radeon HD 4870 X2 vs Radeon HD 5870 – Performance Comparison Benchmarks @ Hardware Compare The 4870x2 Power la..... Free ups!! "Working on imperfect system that demands [...]

Adam says:

and what cpu/clock was used in this comparison? looks cpu bottle necked to me...

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