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GeForce GTS 450 1GB vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTS 450 1GB uses a 40 nm design. nVidia has clocked the core frequency at 783 MHz. The GDDR5 memory works at a frequency of 902 MHz on this model. It features 192 SPUs as well as 32 TAUs and 16 ROPs.

Compare all that to the Radeon HD 4850 X2 512MB, which has core 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 Texture Address Units 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 be 120% quicker than the GeForce GTS 450 1GB in general, because of its higher bandwidth. (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 is a lot (about 100%) more effective at AF 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 using a high resolution is important to you, then the Radeon HD 4850 X2 512MB is superior to the GeForce GTS 450 1GB, 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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs 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 output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max 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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