Question 11900(non K) Will it boost beyond the factory set 65watt TDP ?

[Jonny5isalivetm]

Hello All

I know Alder is just around the corner and all but Rocket-Lake non K chips are getting to be a bit of a bargain for the current latest IPC gains..

If I buy a locked chip, and set the TDP limit in the bios to the max would it boost or should I stop looking at this 😀

Cheers
Jonny

 

[DrMrLordX]

You can force it to reach its boost limits by raising PL1/PL2 and changing tau values. I think. Not sure if the UEFI will let you change PL2 and tau on a non-k chip though.

 

[jpiniero]

Not sure if the UEFI will let you change PL2 and tau on a non-k chip though.

It should but could depend on the board. Just can't go above the locked limits.

 

[DrMrLordX]

It should but could depend on the board. Just can't go above the locked limits.

So there are limits on tau as well? For example, an i9-11900 (non-k) looks like it can boost rather competently, but it has a 65W TDP. So I'm guessing the default PL2 and tau values are lower than on the 11900k.

 

[coercitiv]

So I'm guessing the default PL2 and tau values are lower than on the 11900k.

Nope, the only guaranteed difference is the locked multiplier. Anything else is dictated by the mobo. Buy a decent mobo and you're guaranteed to have full control over PL1, PL2, and tau.

The "65W TDP" is just a marketing sticker now, like "Intel inside".

 

[DrMrLordX]

Nope, the only guaranteed difference is the locked multiplier. Anything else is dictated by the mobo. Buy a decent mobo and you're guaranteed to have full control over PL1, PL2, and tau.

The "65W TDP" is just a marketing sticker now, like "Intel inside".

Interesting. So are there any practical limits on all-core boost? For example, the 11900 has these limits:

Product Specifications

quick reference guide including specifications, features, pricing, compatibility, design documentation, ordering codes, spec codes and more.

ark.intel.com

If you crank up the PL2 and set tau to 0 (infinite), with unlimited cooling, how high could you get the all-core boost? 5 GHz? I think this is the kind of information needed by @Jonny5isalivetm .

 

[TheELF]

Interesting. So are there any practical limits on all-core boost? For example, the 11900 has these limits:

Product Specifications

quick reference guide including specifications, features, pricing, compatibility, design documentation, ordering codes, spec codes and more.

ark.intel.com

If you crank up the PL2 and set tau to 0 (infinite), with unlimited cooling, how high could you get the all-core boost? 5 GHz? I think this is the kind of information needed by @Jonny5isalivetm .

Power limits WILL NOT change clock limits...AT ALL.
TAU will allow the all core clock to be maintained for as long as temps and everything else is in check.

 

[jpiniero]

If you crank up the PL2 and set tau to 0 (infinite), with unlimited cooling, how high could you get the all-core boost? 5 GHz? I think this is the kind of information needed by @Jonny5isalivetm .

4.6.

 

[DrMrLordX]

Power limits WILL NOT change clock limits...AT ALL.

No, but they will change sustained clocks. An 11900 configured with a PL1 of 65W will not sustain all-core clocks of 4.6 GHz (thanks @jpiniero !), but if you raise PL1 or PL2 + extend tau, then yes, you could sustain 4.6 GHz ad infinitum with a 11900. I think you're agreeing with me but trying to be combative anyway.

 

[Jonny5isalivetm]

So it sounds like it would be 4.6 maybe 4.7 with 2 cores active ?
If thats the case then not worth the mollah..

Thankyou all for the inputs!
Intel themselves could not tell me when I quizzed them via live chat (sales force 😀)

 

[DrMrLordX]

So it sounds like it would be 4.6 maybe 4.7 with 2 cores active ?
If thats the case then not worth the mollah..

Thankyou all for the inputs!
Intel themselves could not tell me when I quizzed them via live chat (sales force 😀)

Remember that's for sustained all-core turbo clocks. Smaller numbers of cores can reach 5 GHz+ for short periods of time on an 11900 if that matters to you. Intel does this stuff for a reason. No free lunch and all that.

 

[coercitiv]

So it sounds like it would be 4.6 maybe 4.7 with 2 cores active ?

The 11900 has an all-core boost of 4.7Ghz. That's 8 active cores. For 2 cores I expect 5Ghz+, just as @DrMrLordX mentioned. Between 2 and 8 cores expect the obvious: 4.8-4.9Ghz.

Unfortunately Intel no longer makes this info readily available, so it needs to be dug up by users or reviewers.

Intel themselves could not tell me when I quizzed them via live chat (sales force 😀)

Intel marketing struggles to understand their DYI customers. Hiding max multipliers from tech specs and even from the press was a really poor decision.

 

[TheELF]

No, but they will change sustained clocks. An 11900 configured with a PL1 of 65W will not sustain all-core clocks of 4.6 GHz (thanks @jpiniero !), but if you raise PL1 or PL2 + extend tau, then yes, you could sustain 4.6 GHz ad infinitum with a 11900. I think you're agreeing with me but trying to be combative anyway.

You were talking about 5Ghz all core and that's just not happening.
"If you crank up the PL2 and set tau to 0 (infinite), with unlimited cooling, how high could you get the all-core boost? 5 GHz? I think this is the kind of information needed by @Jonny5isalivetm ."

No, but they will change sustained clocks. An 11900 configured with a PL1 of 65W will not sustain all-core clocks of 4.6 GHz (thanks @jpiniero !), but if you raise PL1 or PL2 + extend tau, then yes, you could sustain 4.6 GHz ad infinitum with a 11900. I think you're agreeing with me but trying to be combative anyway.

And you can also maintain full all core clocks with 65W TDP for most software because most software uses way less power than AVX stress test.
You only need to lift power limits if you run something that actually does hit the PL and doesn't hit max all core .

 

[DrMrLordX]

You were talking about 5Ghz all core and that's just not happening.
"If you crank up the PL2 and set tau to 0 (infinite), with unlimited cooling, how high could you get the all-core boost? 5 GHz? I think this is the kind of information needed by @Jonny5isalivetm ."

It was a question. You could have said 4.6 GHz instead of . . . whatever it was that you were doing.

 

[jpiniero]

The 11900 has an all-core boost of 4.7Ghz.

It's 4.6. You can technically hit 4.7 in TVB mode but that's not really meant to be sustained.

 

[coercitiv]

It's 4.6. You can technically hit 4.7 in TVB mode but that's not really meant to be sustained.

It's 4.7Ghz, only now you're introducing another limitation which is enough cooling to keep peak CPU temp bellow 70C. Perfectly sustainable under certain workloads such as gaming, as long as cooling is adequate. Nevertheless, max all-core boost for the 11900 is 4.7Ghz.

 

[Jonny5isalivetm]

I didnt realise anadtech reviewed the 11900 nice info!

So looks like 5.2ghz for 2 cores looks yummy