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GeForce 9500 GT 512MB GDDR3 vs GeForce GT 420

Intro

The GeForce 9500 GT 512MB GDDR3 uses a 55 nm design. nVidia has clocked the core frequency at 550 MHz. The GDDR3 RAM runs at a speed of 800 MHz on this model. It features 32 SPUs along with 16 TAUs and 8 Rasterization Operator Units.

Compare that to the GeForce GT 420, which makes use of a 40 nm design. nVidia has set the core speed at 700 MHz. The GDDR3 memory is set to run at a frequency of 900 MHz on this specific card. It features 48 SPUs along with 8 TAUs and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The GeForce GT 420 should in theory be a bit faster than the GeForce 9500 GT 512MB GDDR3 overall. (explain)

GeForce GT 420 28800 MB/sec
GeForce 9500 GT 512MB GDDR3 25600 MB/sec
Difference: 3200 (13%)

Texel Rate

The GeForce 9500 GT 512MB GDDR3 will be a lot (approximately 57%) more effective at texture filtering than the GeForce GT 420. (explain)

GeForce 9500 GT 512MB GDDR3 8800 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 3200 (57%)

Pixel Rate

The GeForce 9500 GT 512MB GDDR3 will be a lot (about 57%) better at full screen anti-aliasing than the GeForce GT 420, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce 9500 GT 512MB GDDR3 4400 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 1600 (57%)

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 9500 GT 512MB GDDR3

Amazon.com

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GeForce GT 420

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 9500 GT 512MB GDDR3 GeForce GT 420
Manufacturer nVidia nVidia
Year July 2008 September 2010
Code Name G96b GF108
Memory 512 MB 2048 MB
Core Speed 550 MHz 700 MHz
Memory Speed 1600 MHz 1800 MHz
Power (Max TDP) 50 watts 50 watts
Bandwidth 25600 MB/sec 28800 MB/sec
Texel Rate 8800 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 32 48
Texture Mapping Units 16 8
Render Output Units 8 4
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 314 million 585 million
Bus PCIe x16 2.0, PCI PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, 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 calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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

Display Prices

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GeForce 9500 GT 512MB GDDR3

Amazon.com

Check prices at:

GeForce GT 420

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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