Ok, the TEC is powerful enough then.
The mounting is probably the problem, that clamping method gives war too little clamping pressure on the tec.
The recommended way to do it is to have a separate TEC clamping setup and CPU mounting setup (see DD maze 2.1, 2.2 for an example). TECs need 150-200 psi, on a 48mm TEC that's 500+ pounds of force. A cpu is rated to 24 pounds MAX. so your TEC is underclamped by a factor of 20, not good. All interfaces (cpu and tec to coldplate and block) should have a thin layer of thermal compound of course.
Also you DO NOT want to omit the cold plate, that's a really bad plan as you end up using only a small part of the TEC, you'll burn up the cpu and possibly the TEC too.
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