Normal
The bottom fans can be moved back enough that they wouldn't interfere with a fan mounted under the SFX PSU:The problem is the the flange of the middle frame piece and the mounting screws reduce that available height a bit. I can test it tonight but the problem you'll run into if it does fit is you'll have to remove the power supply to disconnect some of the modular connectors.With a 120mm fan there's just enough space to remove the PCIe cable on the SX500-LG.
The bottom fans can be moved back enough that they wouldn't interfere with a fan mounted under the SFX PSU:
The problem is the the flange of the middle frame piece and the mounting screws reduce that available height a bit. I can test it tonight but the problem you'll run into if it does fit is you'll have to remove the power supply to disconnect some of the modular connectors.
With a 120mm fan there's just enough space to remove the PCIe cable on the SX500-LG.