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Radeon HD 3850 X2 vs Radeon R7 250X

Intro

The Radeon HD 3850 X2 has a core clock frequency of 668 MHz and a GDDR3 memory speed of 828 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon R7 250X, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3850 X2 should theoretically be quite a bit better than the Radeon R7 250X in general. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon R7 250X 72000 MB/sec
Difference: 33984 (47%)

Texel Rate

The Radeon R7 250X is much (more or less 87%) better at AF than the Radeon HD 3850 X2. (explain)

Radeon R7 250X 40000 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 18624 (87%)

Pixel Rate

The Radeon HD 3850 X2 will be a lot (more or less 34%) more effective at anti-aliasing than the Radeon R7 250X, and should be able to handle higher screen resolutions better. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon R7 250X 16000 Mpixels/sec
Difference: 5376 (34%)

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 R7 250X

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 R7 250X
Manufacturer AMD AMD
Year Apr 4, 2008 February 2014
Code Name RV670 PRO Cape Verde XT
Memory 512 MB (x2) 1024 MB
Core Speed 668 MHz (x2) 1000 MHz
Memory Speed 1656 MHz (x2) 4500 MHz
Power (Max TDP) (Unknown) watts 95 watts
Bandwidth 105984 MB/sec 72000 MB/sec
Texel Rate 21376 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 320(64x5) (x2) 640
Texture Mapping Units 16 (x2) 40
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 1500 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: Bandwidth is the max amount of data (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the 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 card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 X2

Amazon.com

Check prices at:

Radeon R7 250X

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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