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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 set the core frequency at 625 MHz. The GDDR3 RAM works at a frequency of 1012 MHz on this specific model. It features 48 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare all of that to the GeForce GT 320, which comes with GPU clock speed of 540 MHz, and 1024 MB of GDDR3 memory set to run at 790 MHz through a 128-bit bus. It also is made up of 72 SPUs, 24 TAUs, and 8 Raster Operation Units.

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

Performance-wise, the GeForce GT 220 GDDR3 should in theory be much superior to 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 should be quite a bit (about 30%) faster with regards to 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 just a bit (more or less 16%) more effective at full screen anti-aliasing than the GeForce GT 320, and able to handle 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

GeForce GT 220 GDDR3

GeForce GT 320

Specifications

Display 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 largest amount of data (counted in MB per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the 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 amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce GT 220 GDDR3

GeForce GT 320

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