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GeForce GT 450 (OEM) vs Radeon HD 4870 1GB

Intro

The GeForce GT 450 (OEM) comes with a clock frequency of 790 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 192-bit bus, and makes use of a 40 nm design. It is comprised of 144 SPUs, 24 TAUs, and 24 Raster Operation Units.

Compare all that to the Radeon HD 4870 1GB, which comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM) 106 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 44 Watts (42%)

Memory Bandwidth

The Radeon HD 4870 1GB, in theory, should perform a little bit faster than the GeForce GT 450 (OEM) in general. (explain)

Radeon HD 4870 1GB 115200 MB/sec
GeForce GT 450 (OEM) 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The Radeon HD 4870 1GB will be much (approximately 58%) better at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 4870 1GB 30000 Mtexels/sec
GeForce GT 450 (OEM) 18960 Mtexels/sec
Difference: 11040 (58%)

Pixel Rate

The GeForce GT 450 (OEM) will be quite a bit (about 58%) faster with regards to full screen anti-aliasing than the Radeon HD 4870 1GB, and also will be able to handle higher resolutions while still performing well. (explain)

GeForce GT 450 (OEM) 18960 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 6960 (58%)

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 4870 1GB

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 4870 1GB
Manufacturer nVidia AMD
Year October 2010 Jun 25, 2008
Code Name GF106 RV770 XT
Memory 1536 MB 1024 MB
Core Speed 790 MHz 750 MHz
Memory Speed 4000 MHz 3600 MHz
Power (Max TDP) 106 watts 150 watts
Bandwidth 96000 MB/sec 115200 MB/sec
Texel Rate 18960 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 18960 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 144 800(160x5)
Texture Mapping Units 24 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 1170 million 956 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number 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 video 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 most pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GT 450 (OEM)

Amazon.com

Radeon HD 4870 1GB

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.

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