User Manual

Table 8. Internal slots (continued)
Description Values
NOTE: SSD2 slot natively supports M.2 2230 and M.2
2280 SSDs.
NOTE: SSD3 slot natively supports only M.2 2280 SSDs.
NOTE: To learn more about the features of different
types of M.2 cards, see the knowledge base article
000144170 at www.dell.com/support.
SATA
● Five SATA 3 slots
PCIe
● One PCIe x16 Gen5 (discrete graphics card only)
● One PCIe x4 Gen4
● One PCIe x4 Gen3
Ethernet
The following table lists the wired Ethernet Local Area Network (LAN) specifications of your Precision 3660 Tower.
Table 9. Ethernet specifications
Description Option one Option two
Model number
Intel I219-LM Intel I225 (optional)
Transfer rate
10/100/1000 Mbps 10/ 100/ 1000/ 2500 Mbps
Wireless module
The following table lists the Wireless Local Area Network (WLAN) modules supported on your Precision 3660 Tower.
Table 10. Wireless module specifications
Description Option one Option two
Model number
Intel AX211 Qualcomm WCN6856-DBS
Transfer rate
2400 Mbps Up to 3571 Mbps
Frequency bands supported
2.40 GHz/5 GHz/6 GHz
NOTE: The 6 GHz frequency is
supported on computers installed
with Windows 11 operating system
only.
2.4 GHz/5 GHz/6 GHz
NOTE: The 6 GHz frequency is
supported on computers installed with
Windows 11 operating system only.
Wireless standards
● WiFi 802.11a/b/g
● Wi-Fi 4 (WiFi 802.11n)
● Wi-Fi 5 (WiFi 802.11ac)
● Wi-Fi 6E (WiFi 802.11ax)
● WiFi 802.11a/b/g
● Wi-Fi 4 (WiFi 802.11n)
● Wi-Fi 5 (WiFi 802.11ac)
● Wi-Fi 6E (WiFi 802.11ax)
Encryption
● 64-bit/128-bit WEP
● AES-CCMP
● TKIP
● 64-bit and 128-bit WEP
● AES-CCMP
● TKIP
Bluetooth
5.2 5.2
Specifications of Precision 3660 Tower 15