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An SFX PSU is about half the total volume of this case (well, that might be a small exaggeration), so that would probably require a complete redesign. There is the CG7 Cravo which fits a TFX PSU in a similar form factor though. SFX would be practical due to availability, but also quite overkill given the power requirements of anything that can fit and be cooled in a case like this, which makes the added volume rather wasteful. TFX seems like a good compromise as such.