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Haha, I don't know which monitor to return. I'm using the newest one from Planar right now. It also has image retention, but not so much as the first one.
 
From what I can tell, there simply never was such a thing as an IX2790 with no issues.

Has anyone heard of such a thing?

..or did the ix2790 only ever exist as a product built specifically as a way to use LG panels with issues that Apple didn’t want for iMacs?
 
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