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Radeon HD 3870 1GB vs Radeon HD 5770

Intro

The Radeon HD 3870 1GB makes use of a 55 nm design. AMD has set the core frequency at 775 MHz. The GDDR4 memory runs at a speed of 1125 MHz on this specific model. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 5770, which has GPU core speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 128-bit bus. It also is made up of 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 3870 1GB 106 Watts
Radeon HD 5770 108 Watts
Difference: 2 Watts (2%)

Memory Bandwidth

The Radeon HD 5770 should in theory perform just a bit faster than the Radeon HD 3870 1GB overall. (explain)

Radeon HD 5770 76800 MB/sec
Radeon HD 3870 1GB 72000 MB/sec
Difference: 4800 (7%)

Texel Rate

The Radeon HD 5770 should be a lot (approximately 174%) better at texture filtering than the Radeon HD 3870 1GB. (explain)

Radeon HD 5770 34000 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 21600 (174%)

Pixel Rate

The Radeon HD 5770 will be a bit (approximately 10%) more effective at full screen anti-aliasing than the Radeon HD 3870 1GB, and will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 5770 13600 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 1200 (10%)

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 3870 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 3870 1GB Radeon HD 5770
Manufacturer AMD AMD
Year Nov 19, 2007 October 13, 2009
Code Name RV670 XT Juniper XT
Memory 1024 MB 1024 MB
Core Speed 775 MHz 850 MHz
Memory Speed 2250 MHz 4800 MHz
Power (Max TDP) 106 watts 108 watts
Bandwidth 72000 MB/sec 76800 MB/sec
Texel Rate 12400 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 13600 Mpixels/sec
Unified Shaders 320(64x5) 800(160x5)
Texture Mapping Units 16 40
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 million
Bus PCIe 2.0 x16/AGP 8x 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 information (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 3870 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

One Response to “Radeon HD 3870 1GB vs Radeon HD 5770”
Raedon hd3870 | Flopovos says:

[...] Radeon HD 3870 1GB vs Radeon HD 5770 – Performance …Radeon HD 3870 1GB vs Radeon HD 5770. Intro. The Radeon HD 3870 1GB has core clock speeds of 775 MHz on the GPU, and 1125 MHz on the 1024 MB of … [...]

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