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Radeon HD 4870 X2 vs Radeon HD 5870


Intro

The Radeon HD 4870 X2 has a clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 5870, which uses a 40 nm design. AMD has set the core speed at 850 MHz. The GDDR5 memory works at a frequency of 1200 MHz on this specific model. It features 1600(320x5) SPUs along with 80 TAUs 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 in general. (explain)

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

Texel Rate

The Radeon HD 5870 should be just a bit (about 13%) better at anisotropic 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

The Radeon HD 5870 should be a small bit (about 13%) more effective at FSAA than the Radeon HD 4870 X2, and also should be able to handle higher resolutions better. (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

Radeon HD 4870 X2

Radeon HD 5870

Specifications

Display 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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If 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 are processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Radeon HD 4870 X2

Radeon HD 5870

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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