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GeForce GTS 450 vs Radeon HD 3870 X2 512MB

Intro

The GeForce GTS 450 comes with a clock frequency of 783 MHz and a GDDR5 memory speed of 902 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 192 SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 3870 X2 512MB, which features a core clock speed of 825 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 512MB will be 100% quicker than the GeForce GTS 450 overall, due to its greater data rate. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
GeForce GTS 450 57728 MB/sec
Difference: 57472 (100%)

Texel Rate

The Radeon HD 3870 X2 512MB will be a little bit (about 5%) better at anisotropic filtering than the GeForce GTS 450. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
GeForce GTS 450 25056 Mtexels/sec
Difference: 1344 (5%)

Pixel Rate

The Radeon HD 3870 X2 512MB will be quite a bit (more or less 111%) better at FSAA than the GeForce GTS 450, and also able to handle higher resolutions more effectively. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
GeForce GTS 450 12528 Mpixels/sec
Difference: 13872 (111%)

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 GTS 450

Amazon.com

Check prices at:

Radeon HD 3870 X2 512MB

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 GTS 450 Radeon HD 3870 X2 512MB
Manufacturer nVidia AMD
Year September 2010 Jan 28, 2008
Code Name GF106 R680
Memory 512 MB 512 MB (x2)
Core Speed 783 MHz 825 MHz (x2)
Memory Speed 3608 MHz 1800 MHz (x2)
Power (Max TDP) 106 watts (Unknown) watts
Bandwidth 57728 MB/sec 115200 MB/sec
Texel Rate 25056 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 192 320(64x5) (x2)
Texture Mapping Units 32 16 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit (x2)
Fab Process 40 nm 55 nm
Transistors 1170 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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses 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 can be processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core 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 rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GTS 450

Amazon.com

Check prices at:

Radeon HD 3870 X2 512MB

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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