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GeForce GT 450 (OEM) vs Radeon HD 7870

Intro

The GeForce GT 450 (OEM) features clock speeds of 790 MHz on the GPU, and 1000 MHz on the 1536 MB of GDDR5 memory. It features 144 SPUs along with 24 TAUs and 24 ROPs.

Compare those specs to the Radeon HD 7870, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It is made up of 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM) 106 Watts
Radeon HD 7870 175 Watts
Difference: 69 Watts (65%)

Memory Bandwidth

The Radeon HD 7870 should in theory perform a lot faster than the GeForce GT 450 (OEM) in general. (explain)

Radeon HD 7870 153600 MB/sec
GeForce GT 450 (OEM) 96000 MB/sec
Difference: 57600 (60%)

Texel Rate

The Radeon HD 7870 is much (more or less 322%) more effective at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 7870 80000 Mtexels/sec
GeForce GT 450 (OEM) 18960 Mtexels/sec
Difference: 61040 (322%)

Pixel Rate

The Radeon HD 7870 will be quite a bit (more or less 69%) more effective at full screen anti-aliasing than the GeForce GT 450 (OEM), and capable of handling higher resolutions better. (explain)

Radeon HD 7870 32000 Mpixels/sec
GeForce GT 450 (OEM) 18960 Mpixels/sec
Difference: 13040 (69%)

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 GT 450 (OEM)

Amazon.com

Radeon HD 7870

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

Model GeForce GT 450 (OEM) Radeon HD 7870
Manufacturer nVidia AMD
Year October 2010 March 2012
Code Name GF106 Pitcairn XT
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 1536 MB 2048 MB
Core Speed 790 MHz 1000 MHz
Shader Speed 1580 MHz (N/A) MHz
Memory Speed 1000 MHz (4000 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 144 1280
Texture Mapping Units 24 80
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 106 watts 175 watts
Shader Model 5.0 5.0
Bandwidth 96000 MB/sec 153600 MB/sec
Texel Rate 18960 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 18960 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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