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Radeon HD 3870 512MB vs Radeon R9 390 8G

Intro

The Radeon HD 3870 512MB features clock speeds of 775 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon R9 390 8G, which comes with GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is made up of 2560 SPUs, 160 TAUs, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 512MB 106 Watts
Radeon R9 390 8G 275 Watts
Difference: 169 Watts (159%)

Memory Bandwidth

Performance-wise, the Radeon R9 390 8G should in theory be much better than the Radeon HD 3870 512MB overall. (explain)

Radeon R9 390 8G 384000 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 326400 (567%)

Texel Rate

The Radeon R9 390 8G should be a lot (approximately 1190%) better at anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon R9 390 8G 160000 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 147600 (1190%)

Pixel Rate

The Radeon R9 390 8G will be a lot (approximately 416%) better at full screen anti-aliasing than the Radeon HD 3870 512MB, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 390 8G 64000 Mpixels/sec
Radeon HD 3870 512MB 12400 Mpixels/sec
Difference: 51600 (416%)

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 512MB

Amazon.com

Check prices at:

Radeon R9 390 8G

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 512MB Radeon R9 390 8G
Manufacturer AMD AMD
Year Nov 19, 2007 June 2015
Code Name RV670 XT Grenada PRO
Memory 512 MB 8192 MB
Core Speed 775 MHz 1000 MHz
Memory Speed 1800 MHz 6000 MHz
Power (Max TDP) 106 watts 275 watts
Bandwidth 57600 MB/sec 384000 MB/sec
Texel Rate 12400 Mtexels/sec 160000 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 320(64x5) 2560
Texture Mapping Units 16 160
Render Output Units 16 64
Bus Type GDDR3 GDDR5
Bus Width 256-bit 512-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million 6200 million
Bus PCIe 2.0 x16/AGP 8x PCIe 3.0 ×16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure 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 filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 512MB

Amazon.com

Check prices at:

Radeon R9 390 8G

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.

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