The MT/DT motherboards have an 8 pin power connector, and a 24 pin ATX to 8 pin adapter is required when planning to use a third party ATX PSU. The key features of the 7020/9020/T1700 are the use of Intel 4th gen Haswell processors. It wouldn't surprise me if the Optiplex 7020/9020 and Precision T1700 uses the same pinout for the Front I/O connector. The USB2 pinout seems to have a standard layout but a normal 0.1" pitch USB2 header plug won't fit onto the 2mm pitch pins. The HDD LED requires an extra 1k resistor. The pinout for the microphone and heaphone have a non-standard layout. The front USB3 sockets are served by a separate cable which plugs into blue coloured USB header socket on the motherboard. Note the presence of a 1k resistor to limit the current through the LED. I replaced the pair with Hynix PC3-12800 DIMMs. In early 2021, the 7010 also started to freeze or crash after exactly 30 minutes of use - I traced the problem to possibly defective or poorly seated Samsung PC3-12800 DIMMs. I fitted a cheap i5-3475s cpu into the 7010 in late 2020.
MOTHERBOARD USB PINOUT HOW TO
I recently found instructions on how to reregister Start process - too early to say whether it will fix the problem once and for all. Only issues I have encountered is the task bar in Windows 10 failing to respond every once in a while for past few years - restarting the Windows Explorer fixed the problem every time. The 9010 runs macOS Mojave, I haven't upgraded to Catalina.
MOTHERBOARD USB PINOUT DRIVERS
No changes to BIOS or Windows drivers since posting in this long thread more than 18 months ago.
MOTHERBOARD USB PINOUT UPDATE
Update (): I also came across this youtube video Update (): I've since discovered a post on reddit created by 'BlastingKap' two months earlier, who had also examined the Front I/O pinout on an Optiplex 7010: It appears the pins have a 2mm pitch instead of the typical 0.1" (2.54mm) pitch too. The Front I/O socket on the motherboard is smaller than normal. However, the e3-1230 v2 Xeon processor is apparently known to work in the 7010 too according to one Youtube video posted back in 2015.
The fastest Dell certified processor for the 7010/9010 is the i7-3770. The Precision T1650 looks very similar and also supports ECC RAM - it is also offered with Xeon e3-1200v2 family of processors, the fastest being the i3-1290v2. The key difference is 9010 has BIOS support RAID. The Optiplex 7010 and 9010 (I have both) appear to use virtually the same motherboard in the mini tower (MT) variant. I thought I would investigate what causes this and other 'Alert!' messages. I have observed if the front I/O cable is detached from the motherboard, there is an 'Alert! Front I/O Cable failure.' error message when booting up the PC. This thread describes the issues with installing an Optiplex 7010/9010 motherboard into a 3rd party ATX case. There is another thread for the Optiplex 7010 power switch and power LED pinout.
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