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GeForce GTX 570 vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 570 features a clock speed of 732 MHz and a GDDR5 memory speed of 950 MHz. It also features a 320-bit bus, and makes use of a 40 nm design. It features 480 SPUs, 60 Texture Address Units, and 40 ROPs.

Compare those specs to the Radeon HD 3870 X2 1GB, which features a clock frequency of 825 MHz and a GDDR4 memory speed of 1126 MHz. It also uses 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.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 570 should theoretically be a small bit better than the Radeon HD 3870 X2 1GB overall. (explain)

GeForce GTX 570 152000 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 7872 (5%)

Texel Rate

The GeForce GTX 570 will be much (approximately 66%) more effective at anisotropic filtering than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 570 43920 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 17520 (66%)

Pixel Rate

The GeForce GTX 570 will be just a bit (approximately 11%) faster with regards to FSAA than the Radeon HD 3870 X2 1GB, and will be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 570 29280 Mpixels/sec
Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Difference: 2880 (11%)

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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GeForce GTX 570

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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 GeForce GTX 570 Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year December 2010 Jan 28, 2008
Code Name GF110 R680
Memory 1280 MB 1024 MB (x2)
Core Speed 732 MHz 825 MHz (x2)
Memory Speed 3800 MHz 2252 MHz (x2)
Power (Max TDP) 219 watts (Unknown) watts
Bandwidth 152000 MB/sec 144128 MB/sec
Texel Rate 43920 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 29280 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 480 320(64x5) (x2)
Texture Mapping Units 60 16 (x2)
Render Output Units 40 16 (x2)
Bus Type GDDR5 GDDR4
Bus Width 320-bit 256-bit (x2)
Fab Process 40 nm 55 nm
Transistors 3000 million (Unknown) million
Bus PCIe x16 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

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

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated 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 rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 570

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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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