What I asking you to confirm, was whether there was a way that the stock cooler can be installed that would change the clearance with the H50? From the pictures of the removed heat-sink I’ve seen on the web, it doesn’t appear to be the case. The heat-sink appears to simply bolt straight-on.
BTW, I’m using the standard fan.
I did finally manage to mount the H50 using the correct screws holes. First, I removed all the motherboard screws and mounted the H50. Then I tried to install the motherboard, but couldn’t install the screws unless I pushed the motherboard hard enough to bend the heat-sink back about 1/8”.
I attached a piece of aluminum angle to the 140mm fan holes and used it bend out the back of the case until that was clearance with the heat-sink.
Since I have the defect back-plane holes, my video card has to be held in with zip-ties. This just made the problem a little worse.
The clearance between the heat-sink and radiator is paper-thin, but it’s there. The video card is actually held in primarily by the screw in the slot below it. I used a small black washer to capture the video-card; the zip-tie is more of a safety feature. (The sound-card in the picture turned out to be tilted out of the PCI slot when I tried to boot the system. I ended up securing it the same way.)
I don’t know if the problem it restricted to the people with defective back-planes. The posts from them that I’ve read don’t mention it. It would be nice to think that if there is a resolution for it, it would also solve the H50 mounting problem.