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Radeon HD 4870 1GB vs Radeon HD 5770

Intro

The Radeon HD 4870 1GB has core clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 5770, which comes with a GPU core clock speed of 850 MHz, and 1024 MB of GDDR5 RAM set to run at 1200 MHz through a 128-bit bus. It also features 800(160x5) Stream Processors, 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 1GB 150 Watts
Difference: 42 Watts (39%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 1GB should perform a lot faster than the Radeon HD 5770 overall. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 38400 (50%)

Texel Rate

The Radeon HD 5770 is a bit (approximately 13%) more effective at AF than the Radeon HD 4870 1GB. (explain)

Radeon HD 5770 34000 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 4000 (13%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 5770 is a better choice, but only just. (explain)

Radeon HD 5770 13600 Mpixels/sec
Radeon HD 4870 1GB 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 1GB

Amazon.com

Check prices at:

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 1GB Radeon HD 5770
Manufacturer AMD AMD
Year Jun 25, 2008 October 13, 2009
Code Name RV770 XT Juniper XT
Memory 1024 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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher 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 card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4870 1GB

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

4 Responses to “Radeon HD 4870 1GB vs Radeon HD 5770”
Huidige video kaart overleden, wil graag een nieuwe kopen need some advice ! :P says:

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خريدار خيلي فوري گرافيك تا 150 تومان - صفحه 2 says:

[...] 1GB GDDD5 گارانتی شاپ تا سال 92 استارتر عزيز 5770 نسبت به 4870 Radeon HD 4870 1GB vs Radeon HD 5770 – Performance Comparison Benchmarks @ Hardware Compare ترجمه متون انگليسی زير قيمت بازار پاسخ با نقل [...]

ATI Shappire 4870 o xfx 5770? says:

[...] y 8x0 mhz de frecuencia, pero la 5xxx tiene 1300mhz y 128 bits. Q se podria concluir con eso? Radeon HD 4870 1GB vs Radeon HD 5770 – Performance Comparison Benchmarks @ Hardware Compare mira ahi hay una buena comparacion, la 4870 le gana por muy poco a una 5770 , algo asi como un 5% [...]

Computer Saphire HD4870 of HD4870x2 - 9lives - Games Forum says:

[...] sorry Succes met de verkoop in alle geval.. De 4870 1GB versie is dan ook een stukje beter: Radeon HD 4870 1GB vs Radeon HD 5770 – Performance Comparison Benchmarks @ Hardware Compare 44 incluis is dus wel een goede prijs dacht [...]

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