Vic384 Thank you for the advice.
it will arrive in a few days. i9 11900, gtx 1660 super 6 gb, 16gb 1x16 ddr4, 512 m2 pcle mvme ssd, 360w fan I would like to add a 2nd hard drive of at least 2T, I like the sound of optane memory but I am confused by how I'd use it, It sounds like it would be advantageous and easy to add another 16g ram what about 2 channel  ? or can i just add optane I also ordered a new 27 inch 4K monitor (hope that doesn't put power unit over the top) I understand the power supply is minimal and i may have to find an upgrade if computer runs hot. When I chose the build a better fan was not offered Any advise would be great, I am in experienced, in the past I just changed broken fans and upgrade ram  
New XPS 8940 upgrade advise requested