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GeForce GTS 450 1GB vs Radeon HD 4850 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 memory. It features 192 SPUs along with 32 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 4850 X2 512MB, which has core clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB 106 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 144 Watts (136%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 512MB should perform much faster than the GeForce GTS 450 1GB overall. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce GTS 450 1GB 57728 MB/sec
Difference: 69376 (120%)

Texel Rate

The Radeon HD 4850 X2 512MB will be much (about 100%) better at anisotropic filtering than the GeForce GTS 450 1GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
GeForce GTS 450 1GB 25056 Mtexels/sec
Difference: 24944 (100%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4850 X2 512MB is a better choice, by a large margin. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
GeForce GTS 450 1GB 12528 Mpixels/sec
Difference: 7472 (60%)

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 4850 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 4850 X2 512MB
Manufacturer nVidia AMD
Year September 2010 Nov 7, 2008
Code Name GF106 R700
Memory 1024 MB 512 MB (x2)
Core Speed 783 MHz 625 MHz (x2)
Memory Speed 3608 MHz 1986 MHz (x2)
Power (Max TDP) 106 watts 250 watts
Bandwidth 57728 MB/sec 127104 MB/sec
Texel Rate 25056 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 192 800(160x5) (x2)
Texture Mapping Units 32 40 (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 956 million
Bus PCIe x16 PCIe 2.0 x16 (PCIe bridge)
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 over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling 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 video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many 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

Hide Prices

GeForce GTS 450 1GB

Amazon.com

Check prices at:

Radeon HD 4850 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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