Question CPU temp skyrockets with side panel on

Oct 19, 2019
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I have an i7 2600k OCed to 4.7ghz cooled by a Noctua NH-D14. My case is a Cougar Panzer Max loaded with a whole bunch of Noctua Fans.

With the side panel off and Prime 95 running my CPU sits happily at 70c but as soon as I put the side panel back on the CPU thermal throttles within 5 seconds. I'm not sure how the cooling could be any better yet it overheats. I've replaced the thermal compound on the CPU and it's had no effect. I'm unsure what to do