Space Available in an M1 with and SFX PSU fitted on an ATX PSU mount?

Arboreal

King of Cable Management
Original poster
Silver Supporter
Oct 11, 2015
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I'm currently running my M1 in a conventional configuration with ITX board / SFX PSU in its side mount / 242mm long GTX 970 blower GPU and have been inspired by the long running '3 slot motherboard in M1' thread over on [H].

I am considering an ASRock B260M-HDV board and making room for it by mounting my SF600 on an ATX PSU mount, (mine was bought used and doesn't have one), and Silverstone PP08 to put it right at the front of the case.

My questions are:

1. What is the maximum length GPU I can fit in this layout? The GPU will sit in slot '2' as it has a 1x slot above it next to the chipset
2. Will I still be able to mount a 120mm fan in the rear position on the side fan bracket?

The inner 'case crammer' has been niggling away to see what i can put in to make it more space efficient and harder to build! XD