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Radeon HD 3870 1GB vs Radeon HD 5770

Intro

The Radeon HD 3870 1GB features a core clock speed of 775 MHz and a GDDR4 memory speed of 1125 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 5770, which has GPU core speed of 850 MHz, and 1024 MB of GDDR5 memory running 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 3870 1GB 106 Watts
Radeon HD 5770 108 Watts
Difference: 2 Watts (2%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5770 should in theory be a small bit superior to 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 should be much (approximately 174%) more effective 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 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 largest amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to 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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