You're looking for a write-up on the Acer IPIMBAR Rev 102A manual link. Here's some information:
4x DDR3 DIMM slots, Dual Channel, max 16GB (standard) or up to 32GB depending on BIOS Expansion Slots: 1x PCIe 3.0 x16, 3x PCIe 2.0 x1 2x SATA III (6Gb/s), 4x SATA II (3Gb/s) The Retro Web Internal Headers & Pinouts acer ipimbar rev 102a manual link
I couldn’t find a direct official manual link for (likely a motherboard model, often used in Acer Aspire desktops like the M3970, M3985, or AM3970 series). You're looking for a write-up on the Acer
If you are looking for specific hardware limits, use these confirmed specs: use these confirmed specs: