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GeForce GTS 450 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTS 450 comes with a GPU core speed of 783 MHz, and the 512 MB of GDDR5 RAM is set to run at 902 MHz through a 128-bit bus. It also is comprised of 192 SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4850 X2 512MB, which features a core clock frequency of 625 MHz and a GDDR3 memory speed of 993 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB is 120% quicker than the GeForce GTS 450 in general, due to its higher data rate. (explain)

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

Texel Rate

The Radeon HD 4850 X2 512MB will be much (about 100%) more effective at AF than the GeForce GTS 450. (explain)

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

Pixel Rate

The Radeon HD 4850 X2 512MB will be a lot (approximately 60%) faster with regards to anti-aliasing than the GeForce GTS 450, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
GeForce GTS 450 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

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 Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year September 2010 Nov 7, 2008
Code Name GF106 R700
Memory 512 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 maximum amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling 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 the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GTS 450

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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