The IS7XM is a built by Lenovo (originally for their ThinkCentre M92P and M82 series desktops, circa 2012–2014). It’s based on the Intel Q77 Express chipset , which supports:

The board surged with power, then died, then surged again. The fans ramped up to a jet-engine scream—the "Turbo" mode. Then, silence.

He looked at the board again. The IS7XM Rev 1.0 had a specific quirk. It monitored the RPM of the CPU fan, but due to a BIOS bug on early revisions, it required a minimum RPM of 800. The silent aftermarket fan the student had installed was running at a whisper-quiet 600 RPM. The board thought the fan was broken.

You're looking for the manual for the Lenovo IS7XM Rev 10 motherboard. Here's what I found:

The IS7XM features a mix of modern and legacy ports suitable for office environments. Lenovo IS7XM Q77 MOTHERBOARD(SOCKET 1155, 1 ... - REO

2nd and 3rd Generation Intel Core i3, i5, and i7; also supports Pentium and Celeron processors. Memory: 4x 240-pin DDR3 DIMM slots. Max Capacity: 32GB (unbuffered, non-ECC). Speed: Supports 1333MHz and 1600MHz. Expansion Slots: 1x PCIe x16 (for dedicated graphics). 1x PCIe x1. 2x Legacy PCI slots. Storage: 4x SATA ports (includes SATA III support). Audio: Realtek ALC662 6-Channel High Definition Audio. Network: Intel 82579 Gigabit Ethernet. Key I/O and Connectivity