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GeForce GTS 450 1GB vs Radeon HD 3870 X2 512MB

Intro

The GeForce GTS 450 1GB has core speeds of 783 MHz on the GPU, and 902 MHz on the 1024 MB of GDDR5 RAM. It features 192 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 3870 X2 512MB, which 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 particular card. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3870 X2 512MB should theoretically perform quite a bit faster than the GeForce GTS 450 1GB overall. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
GeForce GTS 450 1GB 57728 MB/sec
Difference: 57472 (100%)

Texel Rate

The Radeon HD 3870 X2 512MB is a small bit (approximately 5%) better at texture filtering than the GeForce GTS 450 1GB. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
GeForce GTS 450 1GB 25056 Mtexels/sec
Difference: 1344 (5%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 X2 512MB is superior to the GeForce GTS 450 1GB, by a large margin. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
GeForce GTS 450 1GB 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 1GB

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 1GB Radeon HD 3870 X2 512MB
Manufacturer nVidia AMD
Year September 2010 Jan 28, 2008
Code Name GF106 R680
Memory 1024 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 max amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card 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 most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTS 450 1GB

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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