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Radeon HD 3850 512MB vs Radeon R9 390X 8G

Intro

The Radeon HD 3850 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 668 MHz. The GDDR3 RAM runs at a frequency of 828 MHz on this particular card. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare those specifications to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has clocked the core frequency at 1050 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular model. It features 2816 SPUs along with 176 TAUs and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
Radeon R9 390X 8G 275 Watts
Difference: 200 Watts (267%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G should perform much faster than the Radeon HD 3850 512MB in general. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon HD 3850 512MB 52992 MB/sec
Difference: 331008 (625%)

Texel Rate

The Radeon R9 390X 8G is much (more or less 1629%) faster with regards to anisotropic filtering than the Radeon HD 3850 512MB. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 174112 (1629%)

Pixel Rate

The Radeon R9 390X 8G is quite a bit (about 529%) better at FSAA than the Radeon HD 3850 512MB, and also should be capable of handling higher screen resolutions better. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon HD 3850 512MB 10688 Mpixels/sec
Difference: 56512 (529%)

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 512MB

Amazon.com

Check prices at:

Radeon R9 390X 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 3850 512MB Radeon R9 390X 8G
Manufacturer AMD AMD
Year Nov 19, 2007 June 2015
Code Name RV670 PRO Grenada XT
Memory 512 MB 8192 MB
Core Speed 668 MHz 1050 MHz
Memory Speed 1656 MHz 6000 MHz
Power (Max TDP) 75 watts 275 watts
Bandwidth 52992 MB/sec 384000 MB/sec
Texel Rate 10688 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 320(64x5) 2816
Texture Mapping Units 16 176
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: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 512MB

Amazon.com

Check prices at:

Radeon R9 390X 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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