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GeForce GT 320 vs GeForce GT 420

Intro

The GeForce GT 320 uses a 40 nm design. nVidia has set the core speed at 540 MHz. The GDDR3 memory works at a speed of 790 MHz on this particular card. It features 72 SPUs as well as 24 Texture Address Units and 8 ROPs.

Compare those specs to the GeForce GT 420, which features a core clock frequency of 700 MHz and a GDDR3 memory speed of 900 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is comprised of 48 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320 43 Watts
GeForce GT 420 50 Watts
Difference: 7 Watts (16%)

Memory Bandwidth

In theory, the GeForce GT 420 will be 14% faster than the GeForce GT 320 overall, because of its greater data rate. (explain)

GeForce GT 420 28800 MB/sec
GeForce GT 320 25280 MB/sec
Difference: 3520 (14%)

Texel Rate

The GeForce GT 320 is quite a bit (approximately 131%) better at AF than the GeForce GT 420. (explain)

GeForce GT 320 12960 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 7360 (131%)

Pixel Rate

The GeForce GT 320 should be quite a bit (more or less 54%) faster with regards to anti-aliasing than the GeForce GT 420, and also capable of handling higher resolutions better. (explain)

GeForce GT 320 4320 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 1520 (54%)

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 320

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.

Specifications

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Model GeForce GT 320 GeForce GT 420
Manufacturer nVidia nVidia
Year February 2010 September 2010
Code Name GT215 GF108
Memory 1024 MB 2048 MB
Core Speed 540 MHz 700 MHz
Memory Speed 1580 MHz 1800 MHz
Power (Max TDP) 43 watts 50 watts
Bandwidth 25280 MB/sec 28800 MB/sec
Texel Rate 12960 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 72 48
Texture Mapping Units 24 8
Render Output Units 8 4
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 727 million 585 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.3 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GT 320

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.

Comments

One Response to “GeForce GT 320 vs GeForce GT 420”
Windows 7 Andere videokaart? says:

[...] grote fout van Bol.com daar een GT420 slechtere prestaties neerzet dan een GT320 Kijk zelf maar GeForce GT 320 vs GeForce GT 420 PassMark - GeForce GT 320 PassMark - GeForce GT [...]

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