This is an ancient model computer from 2005. It's surprising it still works at all. You will have problems trying to add a video card. The power supply is too small and the space too limited. It would have to be an old used low profile card--not recommended. It would probably not improve the performance. It is time to treat yourself to a newer computer.
The manual does not even have instructions for adding or replacing a video card--
Only a couple of GPU's are listed in the 380 tech guide:
256MB AMD Radeon™ HD 3450 DUAL DVI OR VGA AND TV OUT
256MB NVIDIA GEFORCE 9300 GE
If you're looking to keep your 380, I'm sure you'll find deals on eBay.
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- If you have an Optiplex, stating its model number AND size speeds up troubleshooting. Components vary.
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