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GeForce GT 450 (OEM) vs Radeon HD 7870

Intro

The GeForce GT 450 (OEM) uses a 40 nm design. nVidia has set the core speed at 790 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this particular card. It features 144 SPUs along with 24 Texture Address Units and 24 Rasterization Operator Units.

Compare those specs to the Radeon HD 7870, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this card. It features 1280 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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(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

As far as performance goes, the Radeon HD 7870 should theoretically be a lot better than the GeForce GT 450 (OEM) overall. (explain)

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

Texel Rate

The Radeon HD 7870 is a lot (more or less 322%) better 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 should be much (about 69%) faster with regards to full screen anti-aliasing than the GeForce GT 450 (OEM), and also able to handle higher screen resolutions without losing too much performance. (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

Display Prices

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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

Display Specifications

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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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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