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Radeon HD 4870 512MB vs Radeon HD 5770

Intro

The Radeon HD 4870 512MB features a GPU core clock speed of 750 MHz, and the 512 MB of GDDR5 RAM is set to run at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 5770, which uses a 40 nm design. AMD has clocked the core frequency at 850 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this particular model. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
Radeon HD 4870 512MB 150 Watts
Difference: 42 Watts (39%)

Memory Bandwidth

In theory, the Radeon HD 4870 512MB will be 50% faster than the Radeon HD 5770 in general, due to its higher data rate. (explain)

Radeon HD 4870 512MB 115200 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 38400 (50%)

Texel Rate

The Radeon HD 5770 will be a little bit (approximately 13%) better at AF than the Radeon HD 4870 512MB. (explain)

Radeon HD 5770 34000 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 4000 (13%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 5770 is the winner, but not by far. (explain)

Radeon HD 5770 13600 Mpixels/sec
Radeon HD 4870 512MB 12000 Mpixels/sec
Difference: 1600 (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.

Price Comparison

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Radeon HD 4870 512MB

Amazon.com

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Radeon HD 5770

Amazon.com

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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 512MB Radeon HD 5770
Manufacturer AMD AMD
Year Jun 25, 2008 October 13, 2009
Code Name RV770 XT Juniper XT
Memory 512 MB 1024 MB
Core Speed 750 MHz 850 MHz
Memory Speed 3600 MHz 4800 MHz
Power (Max TDP) 150 watts 108 watts
Bandwidth 115200 MB/sec 76800 MB/sec
Texel Rate 30000 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 13600 Mpixels/sec
Unified Shaders 800(160x5) 800(160x5)
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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

Display Prices

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Radeon HD 4870 512MB

Amazon.com

Check prices at:

Radeon HD 5770

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

2 Responses to “Radeon HD 4870 512MB vs Radeon HD 5770”
4870cf vs 5770cf - Overclock.net - Overclocking.net says:

[...] Posted by JuniorDaisy I have the 512MB 4870. Here is a quick comparison: http://www.hwcompare.com/1161/radeon...adeon-hd-5770/ __________________ ===Club 5770==== ====CM590 Club==== There he goes. One of God's own [...]

Pc upgrade help (K8NF4G-SATA2) | Computers and digital electronic Q & A says:

[...] http://www.hwcompare.com/1161/radeon-hd-…5770 1GB vs 4870 512MB [...]

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