description says ddr4, features says ddr3. which is it?

If you purchase from PC Server and parts, you will receive unit as title states. i5-6500 w/ 16GB DDR4 RAM. We have submitted a request with Amazon to correct errors.

This item states wireless wifi (adapter). does that mean the wifi in not harware installed in the desktop? assuming means a usb wifi adapter (specs)?

The unit I received in October 2022 came with a bluetooth adapter, no wifi adapter

For install of 2nd hard drive/ size question: will a 2tb internal hard drive hdd – 3.5 inch sata fit? ... or only smaller 2.5" hard drives?

I will do my best to answer your question, but the way the question is phrased leads me to believe you want to install a 2nd hard drive, meaning leaving the original in place. If that's the case, the answer is no. You can only have 1 x 3.5 hard drive. You might be able to put 2x 2.5 hard drives in there. However, the computer is designed to take at least 1x 3.5 hard drive. You can use one 2TB 3.5 or 2TB 2.5 hard drive.

The listing says the product comes with a amd radeon r7-350x so shouldn't say "discrete" instead of "integrated"?

does not come with amd radeon gpu has integrated intel hd gpu

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Specifications

Brand	Dell
Series	Optiplex 7040
Product Dimensions	49.02 x 38.86 x 25.65 cm; 5.44 kg
Item model number	7040
Is Discontinued By Manufacturer	No
Form Factor	タワー
Item dimensions W x H	49 x 38.9 x 25.7 cm
Standing screen display size	23.8
Processor Count	1
RAM Size	16 GB
Computer Memory Type	DDR SDRAM
Maximum Memory Supported	16 GB
Memory Clock Speed	2133 MHz
Hard Disk Description	SSD
Graphics Card Interface	Integrated
Wireless Type	802.11n
Number of USB 2.0 Ports	4
Wattage	180 W
Operating System	Windows 10 Pro
Are Batteries Included	No
Item Weight	5.44 Kilograms

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