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GeForce GTS 450 1GB vs Radeon HD 5870

Intro

The GeForce GTS 450 1GB comes with a GPU core speed of 783 MHz, and the 1024 MB of GDDR5 RAM runs at 902 MHz through a 128-bit bus. It also is comprised of 192 Stream Processors, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 5870, which comes with a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is made up of 1600(320x5) SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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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

Theoretically speaking, the Radeon HD 5870 should be a lot faster than the GeForce GTS 450 1GB overall. (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 quite a bit (approximately 171%) faster with regards to texture filtering 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 will be a lot (approximately 117%) more effective at FSAA than the GeForce GTS 450 1GB, and will 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

GeForce GTS 450 1GB

Radeon HD 5870

Specifications

Display 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
Memory 1024 MB 1024 MB
Core Speed 783 MHz 850 MHz
Memory Speed 3608 MHz 4800 MHz
Power (Max TDP) 106 watts 188 watts
Bandwidth 57728 MB/sec 153600 MB/sec
Texel Rate 25056 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 27200 Mpixels/sec
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
Fab Process 40 nm 40 nm
Transistors 1170 million 2154 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 can be applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units 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 of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce GTS 450 1GB

Radeon HD 5870

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