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Radeon HD 4870 1GB vs Radeon HD 5770

Intro

The Radeon HD 4870 1GB comes with core clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 5770, which has a clock frequency of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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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

As far as performance goes, the Radeon HD 4870 1GB should theoretically be much superior to 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 (about 13%) more effective at texture filtering 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 using a high screen resolution is important to you, then the Radeon HD 5770 is a better choice, but not by far. (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

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.

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 largest amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video 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 number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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.

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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