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Radeon HD 3870 X2 512MB vs Radeon HD 7750

Intro

The Radeon HD 3870 X2 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 825 MHz. The GDDR3 RAM works at a frequency of 900 MHz on this specific card. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 7750, which features a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 512 Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3870 X2 512MB should in theory be quite a bit superior to the Radeon HD 7750 overall. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 43200 (60%)

Texel Rate

The Radeon HD 3870 X2 512MB should be just a bit (more or less 3%) better at texture filtering than the Radeon HD 7750. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 800 (3%)

Pixel Rate

The Radeon HD 3870 X2 512MB is much (approximately 106%) more effective at FSAA than the Radeon HD 7750, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 13600 (106%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 7750

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 512MB Radeon HD 7750
Manufacturer AMD AMD
Year Jan 28, 2008 February 2012
Code Name R680 Cape Verde Pro
Memory 512 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 800 MHz
Memory Speed 1800 MHz (x2) 4500 MHz
Power (Max TDP) (Unknown) watts 55 watts
Bandwidth 115200 MB/sec 72000 MB/sec
Texel Rate 26400 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 320(64x5) (x2) 512
Texture Mapping Units 16 (x2) 32
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 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video 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 chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 512MB

Amazon.com

Check prices at:

Radeon HD 7750

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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