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Radeon HD 3850 X2 vs Radeon R9 390X 8G

Intro

The Radeon HD 3850 X2 makes use of a 55 nm design. AMD has clocked the core frequency at 668 MHz. The GDDR3 RAM is set to run at a speed of 828 MHz on this card. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

Compare all that to the Radeon R9 390X 8G, which features a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also features 2816 SPUs, 176 Texture Address Units, and 64 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390X 8G, in theory, should perform much faster than the Radeon HD 3850 X2 in general. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon HD 3850 X2 105984 MB/sec
Difference: 278016 (262%)

Texel Rate

The Radeon R9 390X 8G should be a lot (more or less 765%) faster with regards to anisotropic filtering than the Radeon HD 3850 X2. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 163424 (765%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 390X 8G is the winner, by far. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon HD 3850 X2 21376 Mpixels/sec
Difference: 45824 (214%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3850 X2

Amazon.com

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Radeon R9 390X 8G

Amazon.com

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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 X2 Radeon R9 390X 8G
Manufacturer AMD AMD
Year Apr 4, 2008 June 2015
Code Name RV670 PRO Grenada XT
Memory 512 MB (x2) 8192 MB
Core Speed 668 MHz (x2) 1050 MHz
Memory Speed 1656 MHz (x2) 6000 MHz
Power (Max TDP) (Unknown) watts 275 watts
Bandwidth 105984 MB/sec 384000 MB/sec
Texel Rate 21376 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 320(64x5) (x2) 2816
Texture Mapping Units 16 (x2) 176
Render Output Units 16 (x2) 64
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 512-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million 6200 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) 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 maximum amount of information (counted in MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many 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 X2

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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