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GeForce GT 420 vs GeForce GTS 150

Intro

The GeForce GT 420 has a GPU clock speed of 700 MHz, and the 2048 MB of GDDR3 memory is set to run at 900 MHz through a 128-bit bus. It also is comprised of 48 SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare those specs to the GeForce GTS 150, which uses a 55 nm design. nVidia has clocked the core speed at 740 MHz. The GDDR3 memory works at a frequency of 500 MHz on this model. It features 128 SPUs as well as 64 TAUs 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 150 141 Watts
Difference: 91 Watts (182%)

Memory Bandwidth

As far as performance goes, the GeForce GTS 150 should in theory be just a bit superior to the GeForce GT 420 overall. (explain)

GeForce GTS 150 32000 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 3200 (11%)

Texel Rate

The GeForce GTS 150 is a lot (approximately 746%) more effective at texture filtering than the GeForce GT 420. (explain)

GeForce GTS 150 47360 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 41760 (746%)

Pixel Rate

The GeForce GTS 150 will be quite a bit (more or less 323%) better at FSAA than the GeForce GT 420, and also will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTS 150 11840 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 9040 (323%)

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

Check prices at:

GeForce GTS 150

Amazon.com

Check prices at:

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 150
Manufacturer nVidia nVidia
Year September 2010 March 10, 2009
Code Name GF108 G92b
Memory 2048 MB 1024 MB
Core Speed 700 MHz 740 MHz
Memory Speed 1800 MHz 1000 MHz
Power (Max TDP) 50 watts 141 watts
Bandwidth 28800 MB/sec 32000 MB/sec
Texel Rate 5600 Mtexels/sec 47360 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 11840 Mpixels/sec
Unified Shaders 48 128
Texture Mapping Units 8 64
Render Output Units 4 16
Bus Type GDDR3 GDDR3
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 585 million 754 million
Bus PCIe x16 PCIe x16 2.0
DirectX Version DirectX 11 DirectX 10
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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

Display Prices

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GeForce GT 420

Amazon.com

Check prices at:

GeForce GTS 150

Amazon.com

Check prices at:

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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