If you take the TDP for each it seems to be clear that a 3950x will draw less power. Unless the 7402p draws a lot less power without CPU boost then it is likely the 3950x will be the winner.
The use of boost has no impact on the amount of power a cpu will use. It will use the amount of power that is allowed by the TDP and PPT limits fused into the silicon of the cpu.
So the 3950X and 5950X both have 105W TDP and 142W PPT limits.
Just have to drop the rtx 3080 TI offline and get out my killawatt meter to see.
If you do need to drop the rtx 3080 TI offline, I would be happy to keep it running for you during the summer!
;^)
George,
Thank you for the offer. ;)
I was looking at contingency plans.
What was the "cheapest" setup(s) I could do if I need to lower my electric bill and/or house A/C temperature while keeping my toe in the BOINC research area.
It currently looks like running the 3950x without CPU boost plus one rtx 3080 ti would allow me to continue participating at some level in both U@H and E@H.
The gtx 1080+TN-Grid would be shut down. So would the Ryzen GPU Server. And the Eypc-Disaster system would get a weeks burn in test and then get shut down.
This assumes worst case.
Intermediate steps would include running the EYPC-Disaster system with one Rtx 3080 ti and no boost on the CPU for U@H & modest E@H results beside the 3950x setup. That would allow me to take the b450-F + Ryzen 1700 MB offline and increase the efficiency in general. Although I don't think it would drop the costs quite as far. :(
Anyway.
I clearly was having a fuzzy brain attack when I first tried to formulate the question.
Tom M
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor) I want some more patience. RIGHT NOW!
My offer still stands. If you have another fuzzy brain attack and rethink the 3080-Ti... You know where I'm at.
;^)
You are sure you haven't moved....???? ;)
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor) I want some more patience. RIGHT NOW!
Intermediate steps would include running the EYPC-Disaster system with one Rtx 3080 ti and no boost on the CPU for U@H & modest E@H results beside the 3950x setup. That would allow me to take the b450-F + Ryzen 1700 MB offline and increase the efficiency in general. Although I don't think it would drop the costs quite as far. :(
Anyway.
I clearly was having a fuzzy brain attack when I first tried to formulate the question.
Tom M
You are still fuzzy apparently. There are no boosting controls on Epyc cpus. They run at their defaults and you have no control over where they clock other than increasing or decreasing the loading on the cpu.
If you run all the 48 threads on your 7402P, they will all run at the base clock of 2.8Ghz, maybe a bit better. I manage around 3.53Ghz on 46 threads in use.
If you only lightly load the cpu with say 50% of the threads in use, they will likely run at the max 4Ghz clock frequency.
Intermediate steps would include running the EYPC-Disaster system with one Rtx 3080 ti and no boost on the CPU for U@H & modest E@H results beside the 3950x setup. That would allow me to take the b450-F + Ryzen 1700 MB offline and increase the efficiency in general. Although I don't think it would drop the costs quite as far. :(
Anyway.
I clearly was having a fuzzy brain attack when I first tried to formulate the question.
Tom M
You are still fuzzy apparently. There are no boosting controls on Epyc cpus. They run at their defaults and you have no control over where they clock other than increasing or decreasing the loading on the cpu.
If you run all the 48 threads on your 7402P, they will all run at the base clock of 2.8Ghz, maybe a bit better. I manage around 3.53Ghz on 46 threads in use.
If you only lightly load the cpu with say 50% of the threads in use, they will likely run at the max 4Ghz clock frequency.
you're confusing some specs Keith. you can influence max clocks on the EPYCs if you can change the cTDP. moving the 7402P from default of 185W to 200W, allows you to more reliably peg the clocks at 3.35GHz, even under full load. whereas you might only see 3.25-3.30 @stock 185W
the 7402P will max out at 3.35GHz, not 4.0GHz. I guess you might be thinking of the 7443P specs, which does have those higher clocks.
You are still fuzzy apparently. There are no boosting controls on Epyc cpus.
Apparently I am more fuzzy than I thought. I specifically remember a "CPU boost" setting that defaults to "auto". If it is there in the Epyc bios I expect the CPU to run at less than full overclock with it set to "disabled". Once I have the EPYC MB that is now in the hands of UPS I promise to look (again). :)
Just ran across a Epyc 7452 (32c/64t) for slightly more than what I paid for my 7402p. Rats.
Tom M
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor) I want some more patience. RIGHT NOW!
there are some features present in the BIOS for clocks and boost settings, but on a retail EPYC chip they wont meaningfully change anything (when trying to adjust UP), except cTDP like I mentioned. you could use those settings to adjust DOWN below max clocks if you wanted.
Tom M wrote: Mumble. Just
)
If you do need to drop the rtx 3080 TI offline, I would be happy to keep it running for you during the summer!
;^)
Proud member of the Old Farts Association
Tom M wrote: If you take the
)
The use of boost has no impact on the amount of power a cpu will use. It will use the amount of power that is allowed by the TDP and PPT limits fused into the silicon of the cpu.
So the 3950X and 5950X both have 105W TDP and 142W PPT limits.
The 7402P has a TDP and PPT of 200W.
Ergo the 7402P uses more power.
GWGeorge007 wrote: Tom M
)
George,
Thank you for the offer. ;)
I was looking at contingency plans.
What was the "cheapest" setup(s) I could do if I need to lower my electric bill and/or house A/C temperature while keeping my toe in the BOINC research area.
It currently looks like running the 3950x without CPU boost plus one rtx 3080 ti would allow me to continue participating at some level in both U@H and E@H.
The gtx 1080+TN-Grid would be shut down. So would the Ryzen GPU Server. And the Eypc-Disaster system would get a weeks burn in test and then get shut down.
This assumes worst case.
Intermediate steps would include running the EYPC-Disaster system with one Rtx 3080 ti and no boost on the CPU for U@H & modest E@H results beside the 3950x setup. That would allow me to take the b450-F + Ryzen 1700 MB offline and increase the efficiency in general. Although I don't think it would drop the costs quite as far. :(
Anyway.
I clearly was having a fuzzy brain attack when I first tried to formulate the question.
Tom M
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor) I want some more patience. RIGHT NOW!
My offer still stands. If
)
My offer still stands. If you have another fuzzy brain attack and rethink the 3080-Ti... You know where I'm at.
;^)
Proud member of the Old Farts Association
GWGeorge007 wrote: My offer
)
You are sure you haven't moved....???? ;)
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor) I want some more patience. RIGHT NOW!
Tom M wrote: GWGeorge007
)
LOL!!
I'm about to go to my couch, if that's what you mean.
;^)
Proud member of the Old Farts Association
Tom M wrote: Intermediate
)
You are still fuzzy apparently. There are no boosting controls on Epyc cpus. They run at their defaults and you have no control over where they clock other than increasing or decreasing the loading on the cpu.
If you run all the 48 threads on your 7402P, they will all run at the base clock of 2.8Ghz, maybe a bit better. I manage around 3.53Ghz on 46 threads in use.
If you only lightly load the cpu with say 50% of the threads in use, they will likely run at the max 4Ghz clock frequency.
Keith Myers wrote: Tom M
)
you're confusing some specs Keith. you can influence max clocks on the EPYCs if you can change the cTDP. moving the 7402P from default of 185W to 200W, allows you to more reliably peg the clocks at 3.35GHz, even under full load. whereas you might only see 3.25-3.30 @stock 185W
the 7402P will max out at 3.35GHz, not 4.0GHz. I guess you might be thinking of the 7443P specs, which does have those higher clocks.
_________________________________________________________________________
Keith Myers wrote:You are
)
Apparently I am more fuzzy than I thought. I specifically remember a "CPU boost" setting that defaults to "auto". If it is there in the Epyc bios I expect the CPU to run at less than full overclock with it set to "disabled". Once I have the EPYC MB that is now in the hands of UPS I promise to look (again). :)
Just ran across a Epyc 7452 (32c/64t) for slightly more than what I paid for my 7402p. Rats.
Tom M
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor) I want some more patience. RIGHT NOW!
there are some features
)
there are some features present in the BIOS for clocks and boost settings, but on a retail EPYC chip they wont meaningfully change anything (when trying to adjust UP), except cTDP like I mentioned. you could use those settings to adjust DOWN below max clocks if you wanted.
_________________________________________________________________________