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Radeon HD 3870 1GB vs Radeon HD 5770

Intro

The Radeon HD 3870 1GB has clock 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 specifications to the Radeon HD 5770, which comes with clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator 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 theoretically perform a small 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 is quite a bit (about 174%) more effective 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 is a little bit (about 10%) better at anti-aliasing than the Radeon HD 3870 1GB, and also will be able to handle higher screen 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 MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max 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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