No, don't lap your Ryzen and cooler.
No, don't lap your Ryzen and cooler.
Consider running your Ryzen and cooler in a lap for better cooling. Check the surface for evenness visually—compare to the reference image. The impact on performance is likely minimal, but safety depends on proper installation. Reassembling without a new heatsink may be riskier than replacing it.
Reject outright. All the videos I've watched about someone trying to lapping a Ryzen end up with the same result—don't bother. You might gain a little, but usually it doesn't matter and can even hurt things. The die is fixed onto the IHS, so you can't really improve heat transfer beyond that.
Are you asking about sanding the IHS or the die? Sanding the IHS would reduce its thickness, which might improve heat transfer, but since it's thinner, the cooler's pressure will be lower, potentially causing less effective cooling or even damaging the CPU die. Not worth the risk.
I understand you’re considering disabling your Ryzen CPU for maximum overclocking, but I don’t recommend doing that unless you’re certain it’s faulty. Delidding it could cause more harm than benefit.
Honestly, smoothing isn't beneficial when there aren't enough heat spreaders. For powerful chips like big Xeons or ThreadRippers, it could help slightly, but only a small improvement.