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GeForce GT 450 (OEM) vs Radeon HD 7870

Intro

The GeForce GT 450 (OEM) has clock speeds of 790 MHz on the GPU, and 1000 MHz on the 1536 MB of GDDR5 RAM. It features 144 SPUs as well as 24 TAUs and 24 Rasterization Operator Units.

Compare all that to the Radeon HD 7870, which has a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It features 1280 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 GT 450 (OEM) 106 Watts
Radeon HD 7870 175 Watts
Difference: 69 Watts (65%)

Memory Bandwidth

The Radeon HD 7870 should theoretically perform quite a bit 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 will be quite a bit (about 322%) more effective at anisotropic 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

If using high levels of AA is important to you, then the Radeon HD 7870 is superior to the GeForce GT 450 (OEM), by far. (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

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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

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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 4000 MHz 4800 MHz
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 maximum amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, 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 card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. 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 output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

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