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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 memory is set to run at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 5770, which features a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, 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

The Radeon HD 4870 512MB should in theory be quite a bit faster than the Radeon HD 5770 in general. (explain)

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

Texel Rate

The Radeon HD 5770 should be just a bit (about 13%) faster with regards to anisotropic filtering 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

The Radeon HD 5770 is a bit (about 13%) faster with regards to full screen anti-aliasing than the Radeon HD 4870 512MB, and also capable of handling higher screen resolutions better. (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 maximum amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the 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 most pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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 bandwidth is, the lower the ability to reach 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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