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GeForce GT 220 GDDR3 vs GeForce GT 320

Intro

The GeForce GT 220 GDDR3 comes with core speeds of 625 MHz on the GPU, and 1012 MHz on the 512 MB of GDDR3 RAM. It features 48 SPUs as well as 16 TAUs and 8 ROPs.

Compare those specifications to the GeForce GT 320, which comes with core clock speeds of 540 MHz on the GPU, and 790 MHz on the 1024 MB of GDDR3 memory. It features 72 SPUs along with 24 TAUs and 8 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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 be 28% faster than the GeForce GT 320 in general, due to its higher data rate. (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 much (approximately 30%) more effective at texture 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

If using high levels of AA is important to you, then the GeForce GT 220 GDDR3 is a better choice, though not by far. (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

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

Model GeForce GT 220 GDDR3 GeForce GT 320
Manufacturer nVidia nVidia
Year October 2009 February 2010
Code Name GT216 GT215
Fab Process 40 nm 40 nm
Bus PCIe 2.0 PCIe x16
Memory 512 MB 1024 MB
Core Speed 625 MHz 540 MHz
Shader Speed 1360 MHz 1302 MHz
Memory Speed 1012 MHz (2024 MHz effective) 790 MHz (1580 MHz effective)
Unified Shaders 48 72
Texture Mapping Units 16 24
Render Output Units 8 8
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.3
Power (Max TDP) 58 watts 43 watts
Shader Model 4.1 4.1
Bandwidth 32384 MB/sec 25280 MB/sec
Texel Rate 10000 Mtexels/sec 12960 Mtexels/sec
Pixel Rate 5000 Mpixels/sec 4320 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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