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GeForce GT 220 GDDR3 vs GeForce GT 320

Intro

The GeForce GT 220 GDDR3 makes use of a 40 nm design. nVidia has clocked the core frequency at 625 MHz. The GDDR3 memory runs at a frequency of 1012 MHz on this specific card. It features 48 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare all that to the GeForce GT 320, which uses a 40 nm design. nVidia has clocked the core speed at 540 MHz. The GDDR3 RAM is set to run at a frequency of 790 MHz on this model. It features 72 SPUs as well as 24 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320 43 Watts
GeForce GT 220 GDDR3 58 Watts
Difference: 15 Watts (35%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 220 GDDR3 should perform much faster than the GeForce GT 320 overall. (explain)

GeForce GT 220 GDDR3 32384 MB/sec
GeForce GT 320 25280 MB/sec
Difference: 7104 (28%)

Texel Rate

The GeForce GT 320 will be a lot (about 30%) better at anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

GeForce GT 320 12960 Mtexels/sec
GeForce GT 220 GDDR3 10000 Mtexels/sec
Difference: 2960 (30%)

Pixel Rate

The GeForce GT 220 GDDR3 is a little bit (more or less 16%) faster with regards to FSAA than the GeForce GT 320, and capable of handling higher resolutions while still performing well. (explain)

GeForce GT 220 GDDR3 5000 Mpixels/sec
GeForce GT 320 4320 Mpixels/sec
Difference: 680 (16%)

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 220 GDDR3

Amazon.com

GeForce GT 320

Amazon.com

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 220 GDDR3 GeForce GT 320
Manufacturer nVidia nVidia
Year October 2009 February 2010
Code Name GT216 GT215
Memory 512 MB 1024 MB
Core Speed 625 MHz 540 MHz
Memory Speed 2024 MHz 1580 MHz
Power (Max TDP) 58 watts 43 watts
Bandwidth 32384 MB/sec 25280 MB/sec
Texel Rate 10000 Mtexels/sec 12960 Mtexels/sec
Pixel Rate 5000 Mpixels/sec 4320 Mpixels/sec
Unified Shaders 48 72
Texture Mapping Units 16 24
Render Output Units 8 8
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 486 million 727 million
Bus PCIe 2.0 PCIe x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.3

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels 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 number of Raster Operations Pipelines 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 rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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