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GeForce GT 420 vs GeForce GTS 450

Intro

The GeForce GT 420 uses a 40 nm design. nVidia has clocked the core speed at 700 MHz. The GDDR3 RAM works at a frequency of 900 MHz on this card. It features 48 SPUs along with 8 Texture Address Units and 4 ROPs.

Compare all that to the GeForce GTS 450, which comes with core clock speeds of 783 MHz on the GPU, and 902 MHz on the 512 MB of GDDR5 memory. It features 192 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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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

In theory, the GeForce GTS 450 should 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 is much (approximately 347%) more effective at texture filtering than the GeForce GT 420. (explain)

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

Pixel Rate

The GeForce GTS 450 should be much (approximately 347%) better at FSAA than the GeForce GT 420, and also capable of handling higher screen resolutions without slowing down too much. (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

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.

Specifications

Display 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: Bandwidth is the max amount of data (counted in MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed 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 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 number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

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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