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Radeon HD 3870 X2 1GB vs Radeon R7 250X

Intro

The Radeon HD 3870 X2 1GB has a core clock speed of 825 MHz and a GDDR4 memory frequency of 1126 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare all that to the Radeon R7 250X, which comes with a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 1GB is 100% quicker than the Radeon R7 250X in general, because of its higher data rate. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
Radeon R7 250X 72000 MB/sec
Difference: 72128 (100%)

Texel Rate

The Radeon R7 250X is quite a bit (more or less 52%) more effective at texture filtering than the Radeon HD 3870 X2 1GB. (explain)

Radeon R7 250X 40000 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 13600 (52%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3870 X2 1GB is superior to the Radeon R7 250X, by far. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Radeon R7 250X 16000 Mpixels/sec
Difference: 10400 (65%)

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 3870 X2 1GB

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 3870 X2 1GB Radeon R7 250X
Manufacturer AMD AMD
Year Jan 28, 2008 February 2014
Code Name R680 Cape Verde XT
Memory 1024 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 1000 MHz
Memory Speed 2252 MHz (x2) 4500 MHz
Power (Max TDP) (Unknown) watts 95 watts
Bandwidth 144128 MB/sec 72000 MB/sec
Texel Rate 26400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 26400 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 GDDR4 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 information (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core 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 is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 1GB

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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