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GeForce GT 420 vs GeForce GTX 460

Intro

The GeForce GT 420 features a core clock frequency of 700 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 48 SPUs, 8 TAUs, and 4 ROPs.

Compare those specs to the GeForce GTX 460, which uses a 40 nm design. nVidia has set the core speed at 675 MHz. The GDDR5 RAM runs at a frequency of 900 MHz on this specific card. It features 336 SPUs along with 56 Texture Address Units and 24 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
GeForce GTX 460 150 Watts
Difference: 100 Watts (200%)

Memory Bandwidth

In theory, the GeForce GTX 460 should perform a lot faster than the GeForce GT 420 overall. (explain)

GeForce GTX 460 86400 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 57600 (200%)

Texel Rate

The GeForce GTX 460 is a lot (approximately 575%) more effective at AF than the GeForce GT 420. (explain)

GeForce GTX 460 37800 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 32200 (575%)

Pixel Rate

The GeForce GTX 460 is much (approximately 479%) more effective at AA than the GeForce GT 420, and also should be able to handle higher screen resolutions better. (explain)

GeForce GTX 460 16200 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 13400 (479%)

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

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GeForce GTX 460

Amazon.com

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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 GTX 460
Manufacturer nVidia nVidia
Year September 2010 July 2010
Code Name GF108 GF104
Memory 2048 MB 768 MB
Core Speed 700 MHz 675 MHz
Memory Speed 1800 MHz 3600 MHz
Power (Max TDP) 50 watts 150 watts
Bandwidth 28800 MB/sec 86400 MB/sec
Texel Rate 5600 Mtexels/sec 37800 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 16200 Mpixels/sec
Unified Shaders 48 336
Texture Mapping Units 8 56
Render Output Units 4 24
Bus Type GDDR3 GDDR5
Bus Width 128-bit 192-bit
Fab Process 40 nm 40 nm
Transistors 585 million 1950 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 maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GT 420

Amazon.com

Check prices at:

GeForce GTX 460

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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