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GeForce GT 420 vs GeForce GTS 450

Intro

The GeForce GT 420 features a clock frequency of 700 MHz and a GDDR3 memory speed of 900 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is made up of 48 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare that to the GeForce GTS 450, which uses a 40 nm design. nVidia has clocked the core speed at 783 MHz. The GDDR5 memory works at a frequency of 902 MHz on this card. It features 192 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
GeForce GTS 450 106 Watts
Difference: 56 Watts (112%)

Memory Bandwidth

The GeForce GTS 450 should in theory be quite a bit faster than the GeForce GT 420 overall. (explain)

GeForce GTS 450 57728 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 28928 (100%)

Texel Rate

The GeForce GTS 450 will be a lot (approximately 347%) more effective at anisotropic filtering than the GeForce GT 420. (explain)

GeForce GTS 450 25056 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 19456 (347%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTS 450 is the winner, and very much so. (explain)

GeForce GTS 450 12528 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 9728 (347%)

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 420

Amazon.com

GeForce GTS 450

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 420 GeForce GTS 450
Manufacturer nVidia nVidia
Year September 2010 September 2010
Code Name GF108 GF106
Memory 2048 MB 512 MB
Core Speed 700 MHz 783 MHz
Memory Speed 1800 MHz 3608 MHz
Power (Max TDP) 50 watts 106 watts
Bandwidth 28800 MB/sec 57728 MB/sec
Texel Rate 5600 Mtexels/sec 25056 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 12528 Mpixels/sec
Unified Shaders 48 192
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type GDDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 585 million 1170 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number 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 lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GT 420

Amazon.com

GeForce GTS 450

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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