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GeForce 9500 GT 1GB GDDR3 vs GeForce GT 420

Intro

The GeForce 9500 GT 1GB GDDR3 has core speeds of 550 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR3 RAM. It features 32 SPUs along with 16 Texture Address Units and 8 Rasterization Operator Units.

Compare those specs to the GeForce GT 420, which has core clock speeds of 700 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR3 memory. It features 48 SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

As far as performance goes, the GeForce GT 420 should in theory be just a bit superior to the GeForce 9500 GT 1GB GDDR3 overall. (explain)

GeForce GT 420 28800 MB/sec
GeForce 9500 GT 1GB GDDR3 25600 MB/sec
Difference: 3200 (13%)

Texel Rate

The GeForce 9500 GT 1GB GDDR3 is a lot (more or less 57%) better at anisotropic filtering than the GeForce GT 420. (explain)

GeForce 9500 GT 1GB GDDR3 8800 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 3200 (57%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 9500 GT 1GB GDDR3 is superior to the GeForce GT 420, and very much so. (explain)

GeForce 9500 GT 1GB 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 1GB GDDR3

Amazon.com

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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.

Specifications

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Model GeForce 9500 GT 1GB GDDR3 GeForce GT 420
Manufacturer nVidia nVidia
Year July 2008 September 2010
Code Name G96b GF108
Memory 1024 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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 9500 GT 1GB 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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