I have a AMD Ryzen Threadripper PRO 5995WX which I can’t seem to sell - it is brand new and sealed (RMA).
So if I can’t sell it, I might use it for my home server.
However I don’t want a chip idling at 100W (not sure if that’s the correct figure) running 24/7, so is there an easy way I can reduce that? Would disabling a bunch of cores help?
Uh… what are you trying to get out of it to sell? 
There are things you can do with TPL, but the 5995WX is actually pretty power efficient in power per core; but it is the number of cores it is feeding; so you’re going to have a high power draw number.
The extremely high idle power draw of multi-CCD AMD processors is due to the power overhead of “infinity fabric” and the IO die.
Milan generation Epyc and Threadripper CPUs effectively doubled that power overhead by clocking the fabric at the same speed as memory (e.g. 3200 mhz). The previous Rome generation clocked the fabric at only half the memory clock (e.g. 2933 ÷ 2 = 1466 mhz).
The conclusion, then, is that you can reduce idle power draw by lowering memory speed and thereby fabric speed. Another idea is to disable any PBO or OC features in the BIOS.
In my experience, my single processor Epyc 7713P machine with only 6 DIMMs drew about 150 watts at idle. My entire dual processor Cascade Lake system with 12 DIMMs and 3x the number of PCIe cards draws only 105 watts at idle. This was measured at the wall, running Linux, for perspective. Under Windows the idle power draw was about double these figures, for both systems.
I have it listed online for £4,000 but open to offers. I don’t have a need for it anymore and it’s a fresh unit, so I’d rather it go to someone who could make use of it. I don’t want to sit on something so brilliant and not use it.
Even if I run it without any modifications, I estimate daily power cost to be £1/day which isn’t too terrible.
Thank you for the information and sharing your experience.
Under Windows the idle power draw was about double these figures, for both systems.
Why am I not surprised?! 
Where do you have it listed? You could try listing it on somewhere like r/hardwareswap or similar places, if you haven’t already. The problem I see is that anyone looking to buy one is already willing to spend thousands of pounds on a single component, so it’d be understandable for them to justify extra cost for the peace of mind of not buying it from a stranger.
I have it up on eBay. I sold a previous unit (used) after about 3 months of it being listed so I can totally understand what you’re saying here.
Most likely… But you could just trade me for my 5955wx for the reduction in power draw and a bump in clock speed. 
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