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GeForce GTS 450 vs Radeon HD 3870 X2 512MB

Intro

The GeForce GTS 450 makes use of a 40 nm design. nVidia has set the core speed at 783 MHz. The GDDR5 RAM is set to run at a speed of 902 MHz on this particular card. It features 192 SPUs along with 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 3870 X2 512MB, which has clock speeds of 825 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 X2 512MB should be 100% quicker than the GeForce GTS 450 overall, due to its higher 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 (more or less 5%) better at AF 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 a lot (approximately 111%) faster with regards to full screen anti-aliasing than the GeForce GTS 450, and also should be capable of handling higher resolutions without losing too much performance. (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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once 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 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 per second. This is calculated by multiplying the total number 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 processed per second.

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