Yes.

By: Charlie (charlie.delete@this.sa.com), January 19, 2019 10:17 pm
Room: Moderated Discussions
Mark Roulo (nothanks.delete@this.xxx.com) on January 18, 2019 6:19 pm wrote:
> Charlie (charlie.delete@this.sa.com) on January 18, 2019 10:40 am wrote:
> > John (john.delete@this.not.com) on January 18, 2019 4:52 am wrote:
> > > The i9-9990XE chip has a '255W TDP'. Is that literally
> > > just the max settable TDP due to being an 8-bit integer?
> >
> > You can set TDP up to 4095.75 W. Download XTU and see for yourself.
>
>
> If Intel *really* wants a higher TDP, they'll have to recompile the VHDL
> for the chip with the TDP paths specified as 16-bit rather than 8-bit.
>
> The 4095.75 is basically a hack where the chip re-interprets the 8-bit unsigned integer
> path as a weird 8-bit floating point value. This is only to support over-clockers.
>
>

Your theory is disproven by the fact that you can set the TDP in 250 mW increments all the way from 255 W to 4 kW. In fact, you can set TDP between 300-400 W to manage overclocked SKX chips via RAPL instead of thermal throttling.
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TopicPosted ByDate
255W TDP = 8-bit integer?John2019/01/18 05:52 AM
  255W TDP = 8-bit integer?Groo2019/01/18 08:52 AM
    255W TDP = 8-bit integer?Jeff S.2019/01/18 09:32 AM
  255W TDP = 8-bit integer?Charlie2019/01/18 11:40 AM
    255W TDP = 8-bit integer?dmcq2019/01/18 06:22 PM
      255W TDP = 8-bit integer?David Hess2019/02/12 10:37 AM
    Yes.Mark Roulo2019/01/18 07:19 PM
      Yes.Charlie2019/01/19 10:17 PM
        Mark probably skipped the sarcasm tags (NT)David Kanter2019/01/20 09:27 AM
          Mark probably skipped the sarcasm tags ... yesMark Roulo2019/01/20 03:32 PM
        David can you ban this asshole?Groo2019/01/20 10:47 AM
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