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Radeon HD 3850 256MB vs Radeon R9 M390X

Intro

The Radeon HD 3850 256MB has a GPU core speed of 668 MHz, and the 256 MB of GDDR3 memory runs at 828 MHz through a 256-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 TAUs, and 16 ROPs.

Compare that to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this model. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
Radeon R9 M390X 125 Watts
Difference: 50 Watts (67%)

Memory Bandwidth

Theoretically, the Radeon R9 M390X should perform quite a bit faster than the Radeon HD 3850 256MB in general. (explain)

Radeon R9 M390X 160000 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 107008 (202%)

Texel Rate

The Radeon R9 M390X should be much (about 766%) faster with regards to anisotropic filtering than the Radeon HD 3850 256MB. (explain)

Radeon R9 M390X 92544 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 81856 (766%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 M390X is a better choice, by a large margin. (explain)

Radeon R9 M390X 23136 Mpixels/sec
Radeon HD 3850 256MB 10688 Mpixels/sec
Difference: 12448 (116%)

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 3850 256MB

Amazon.com

Check prices at:

Radeon R9 M390X

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 3850 256MB Radeon R9 M390X
Manufacturer AMD AMD
Year Nov 19, 2007 2015
Code Name RV670 PRO Tonga
Memory 256 MB 4096 MB
Core Speed 668 MHz 723 MHz
Memory Speed 1656 MHz 5000 MHz
Power (Max TDP) 75 watts 125 watts
Bandwidth 52992 MB/sec 160000 MB/sec
Texel Rate 10688 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 320(64x5) 2048
Texture Mapping Units 16 128
Render Output Units 16 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its 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 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 256MB

Amazon.com

Check prices at:

Radeon R9 M390X

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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