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GeForce GTS 450 1GB vs Radeon HD 5870

Intro

The GeForce GTS 450 1GB makes use of a 40 nm design. nVidia has set the core speed at 783 MHz. The GDDR5 RAM runs at a speed of 902 MHz on this model. It features 192 SPUs as well as 32 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 5870, which comes with GPU clock speed of 850 MHz, and 1024 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also features 1600(320x5) SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB 106 Watts
Radeon HD 5870 188 Watts
Difference: 82 Watts (77%)

Memory Bandwidth

In theory, the Radeon HD 5870 should be 166% faster than the GeForce GTS 450 1GB overall, due to its higher bandwidth. (explain)

Radeon HD 5870 153600 MB/sec
GeForce GTS 450 1GB 57728 MB/sec
Difference: 95872 (166%)

Texel Rate

The Radeon HD 5870 will be much (approximately 171%) more effective at AF than the GeForce GTS 450 1GB. (explain)

Radeon HD 5870 68000 Mtexels/sec
GeForce GTS 450 1GB 25056 Mtexels/sec
Difference: 42944 (171%)

Pixel Rate

The Radeon HD 5870 is a lot (about 117%) better at full screen anti-aliasing than the GeForce GTS 450 1GB, and should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 5870 27200 Mpixels/sec
GeForce GTS 450 1GB 12528 Mpixels/sec
Difference: 14672 (117%)

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.

Price Comparison

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GeForce GTS 450 1GB

Amazon.com

Radeon HD 5870

Amazon.com

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 5870
Manufacturer nVidia AMD
Year September 2010 September 23, 2009
Code Name GF106 Cypress XT
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe 2.1 x16
Memory 1024 MB 1024 MB
Core Speed 783 MHz 850 MHz
Shader Speed 1566 MHz (N/A) MHz
Memory Speed 3608 MHz 4800 MHz
Unified Shaders 192 1600(320x5)
Texture Mapping Units 32 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 3.2
Power (Max TDP) 106 watts 188 watts
Shader Model 5.0 5.0
Bandwidth 57728 MB/sec 153600 MB/sec
Texel Rate 25056 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 27200 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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