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Radeon HD 3870 1GB vs Radeon HD 5770

Intro

The Radeon HD 3870 1GB has core speeds of 775 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR4 RAM. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 5770, which makes use of a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 RAM is set to run at a frequency of 1200 MHz on this specific model. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

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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

Theoretically speaking, the Radeon HD 5770 should be a bit faster than the Radeon HD 3870 1GB in general. (explain)

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

Texel Rate

The Radeon HD 5770 will be quite a bit (more or less 174%) better at anisotropic 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

If running with a high screen resolution is important to you, then the Radeon HD 5770 is superior to the Radeon HD 3870 1GB, not by a very large margin though. (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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's 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 better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

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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