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Radeon HD 3850 X2 vs Radeon R9 M280X

Intro

The Radeon HD 3850 X2 uses a 55 nm design. AMD has set the core speed at 668 MHz. The GDDR3 memory works at a frequency of 828 MHz on this specific model. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Compare all that to the Radeon R9 M280X, which comes with core speeds of 900 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3850 X2 should theoretically be a bit superior to the Radeon R9 M280X overall. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 17984 (20%)

Texel Rate

The Radeon R9 M280X will be a lot (more or less 136%) more effective at texture filtering than the Radeon HD 3850 X2. (explain)

Radeon R9 M280X 50400 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 29024 (136%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3850 X2 is superior to the Radeon R9 M280X, and very much so. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 6976 (48%)

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

Check prices at:

Radeon R9 M280X

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 X2 Radeon R9 M280X
Manufacturer AMD AMD
Year Apr 4, 2008 Feb 9 2015
Code Name RV670 PRO Saturn XT
Memory 512 MB (x2) 4096 MB
Core Speed 668 MHz (x2) 900 MHz
Memory Speed 1656 MHz (x2) 5500 MHz
Power (Max TDP) (Unknown) watts 75 watts
Bandwidth 105984 MB/sec 88000 MB/sec
Texel Rate 21376 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 320(64x5) (x2) 896
Texture Mapping Units 16 (x2) 56
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 3850 X2

Amazon.com

Check prices at:

Radeon R9 M280X

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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