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

Intro

The GeForce GTS 450 1GB comes with a GPU clock speed of 783 MHz, and the 1024 MB of GDDR5 RAM runs at 902 MHz through a 128-bit bus. It also features 192 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 4850 X2 512MB, which has GPU clock speed of 625 MHz, and 512 MB of GDDR3 RAM set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation 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

Performance-wise, the Radeon HD 4850 X2 512MB should in theory be a lot better 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 is quite a bit (approximately 100%) more effective at texture 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

The Radeon HD 4850 X2 512MB should be quite a bit (about 60%) faster with regards to anti-aliasing than the GeForce GTS 450 1GB, and will be able to handle higher screen resolutions without slowing down too much. (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 information (measured in MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the 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 that the graphics chip 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 number of Raster Operations Pipelines by the the card's clock speed. 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 rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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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.

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