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Radeon HD 3870 1GB vs Radeon HD 7990

Intro

The Radeon HD 3870 1GB uses a 55 nm design. AMD has clocked the core speed at 775 MHz. The GDDR4 RAM runs at a speed of 1125 MHz on this specific card. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 7990, which comes with a core clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 1GB 106 Watts
Radeon HD 7990 375 Watts
Difference: 269 Watts (254%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform much faster than the Radeon HD 3870 1GB in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 3870 1GB 72000 MB/sec
Difference: 504000 (700%)

Texel Rate

The Radeon HD 7990 will be quite a bit (approximately 1861%) better at anisotropic filtering than the Radeon HD 3870 1GB. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 230800 (1861%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7990 is the winner, by far. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 48400 (390%)

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 1GB

Amazon.com

Check prices at:

Radeon HD 7990

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 1GB Radeon HD 7990
Manufacturer AMD AMD
Year Nov 19, 2007 April 2013
Code Name RV670 XT Malta
Memory 1024 MB 3072 MB (x2)
Core Speed 775 MHz 950 MHz (x2)
Memory Speed 2250 MHz 6000 MHz (x2)
Power (Max TDP) 106 watts 375 watts
Bandwidth 72000 MB/sec 576000 MB/sec
Texel Rate 12400 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 320(64x5) 2048 (x2)
Texture Mapping Units 16 128 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR4 GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 55 nm 28 nm
Transistors (Unknown) million 4313 million
Bus PCIe 2.0 x16/AGP 8x PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 7990

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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