Question HP Compaq 6300 Pro SFF CHFAN2

Mar 3, 2019
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So, I'm doing something a bit different with my 6300. I am adding a full size GPU, and the shroud wouldn't fit, as it contacted the CPU heatsink. So I took the shroud off, and am going to attach an 80mm case fan to the heatsink. However, it's a 3 pin fan, and the only open fan header is CHFAN2, which is a 4 pin header. The 3 pin fan will not plug into the 4 pin header without clipping those little "guide plastic pieces" (no idea what they're actually called). What is the pinout for that 4 pin connector so I know which side to trim?