3900x massive temp spikes under watercooling

[wookiee87]

hey all as the title i rebuild my pc using my 3900x from a itx to a full blown atx custom cooling setup, mostly ek vector blocks and 2 360mm pe classic rads, now my issue is the cpu, since it's changed over from the itx build I've noticed massive temp spikes of almost 50 degrees in a split second when i hit the cpu with load.

it doesn't matter if the cpu is at stock or overclocked the temp spikes are huge and it was never like it before, i have tried different power plans in windows but nothing seems to make a difference.

its like the tim between the core and ihs has gone, at idle my cpu temps are awesome around 27 degrees but any kind of load and it hits 45-60 and if i run a benchmark 77.5 degrees in most cases, as soon as the load is gone my temps plummet back to under 30.

I've had the vector am4 cpu block of 3 times now and everything looks good the fins are all clear within, plus i have the correct jet plate installed and orientation of the block too. finally i have a really good spread of thermal paste to, not to thin not to thick

any help please

 

[wookiee87]

i had to lock at 4.1ghz in my itx build but even then it wouldnt break 70 under heavy load, before i could run 4.425gz all core at 1.35v and never hit 70, but in my new build using the same chip and board the temp jumps are insane +50 degrees in a spit second? either overclocked to 4.4ghz or stock speed

 

[wookiee87]

You got all the air bubbles out?

yep all air bubbles are out was a bad one in the cpu block but after some rocking it cleared, topped up the loop and carried on, i have 6 noctua nf12x25 fans attached to all the rads (between 1100rpm idle and 1700ish under load), thing is plenty of heat is being expelled under load and at idle a lovely cool breeze if felt.
My gpu under water never goes above 48 degrees even with a 2ghz core and +1000mhz on the ram overclock.

i don't know why but its just the cpu that's the problem, i have a new ek magnitude cpu block arriving in the next few days so will give that a go but if i get the same issue would it be the cpu?, i know it would be a pain but i could get a 3950x, i just hope that hasn't got the same type of issues if i opt for one

 

[wookiee87]

yeah amd's new zen chips used soldered ihs's its got me thinking that that has possible degraded? but how i wouldn't have the foggiest what cased it, as up until now the cpu has been great, was cool running and did overclock like a stab rat before my itx build

 

[wookiee87]

At a guess either you have an issue with your plumbing in your loop or your cooling isn't up to the job of keeping the thermals the CPU is putting out under control.

to be clear my gpu has access to one 360mm rad on the bottom of the case, the coolant then goes to the cpu and vrm's after that it goes to the second 360mm rad and then back to the distro plate to start the cycle over again i use soft tubing which is 13/19mm size wise

 

[wookiee87]

Try your new block see what happens
Still a possibility of an air bubble somewhere you can't see I guess
I tend to Ramp up my pump to max
And down and up etc if trying to clear all the air
Still think cpu fault is unlikely not seen any posts on 3900x failures so to speak

time will tell i'm hoping its a cpu block issue, but i never had issues first time around, i cleaned all old kit before re-using it, but again the cpu/block is the issue

 

[wookiee87]

Loop order is irrelevant
As long as the pumps being fed
The loop equalises after a while regardless of loop order anyway

i should have said each componet in my build has access to a 360mm rad which should equil around 1,000w of cooling capacity at full wack give or take

 

[wookiee87]

You know your CPU is fine, as you've used it before
It sounds like you have been thorough with your loop assembly and mounting.

What voltages is your mobo pushing to your CPU ?

locked at 1.3v at 4.4ghz all core and auto at stock which would be (1.48v ish but boosting around the same 4.450mhz normaly)

 

[wookiee87]

they did i saw in hwinfo under idle state the voltage would drop to 1.1v then ramp up to 1.5v under load that's when the cores boosted. even this wouldn't stop the cpu spiking, yes not as bad but still around 40 degrees in a split second which is odd, as i said earlier under overclocked settings the jump is more like 50 degrees, it never did that before, sure it would get hot but that would be a good few 10's of minutes before it got to 70ish degrees, i cant work out why it jumps from 30ish to 77.5 degrees in the snap of a finger and then tanks from that top temp back to 30ish degrees at idle

 

[wookiee87]

Done a bios update?
Assuming you are using different motherboard than was in itx build
Updated all amd drivers?
Mine spikes a bit but not that severely
And I am using ultimate performance power plan
And my fans only 1000rpm maximum
Though I do have more radiator than you

i have a asus crosshair VIII updated to bios version 1302 and have downloaded the latest amd chipset drivers this was the board i sued before my newer itx build, but decided to re use it, fan wise mine ram up to around 1350-1400rpm, been playing destiny 2 for a bit and temps look ok but every now and then (roughly 15 second apart) i get spikes of 20 degrees which push up near 75 degrees, have i missed something as over the weekend i had to reinstall windows again due to constant bsod (taking the boot drive from my itx build and using it in the new atx setup)

 

[wookiee87]

just ram cpu-z built in benchmark and with cpu at 4.4ghz and 1.35v i hit 78.3 degrees with in a second, headed into the bios and set everything to auto ran the same test and my cpu boosted to 4.513ghz on most cores (8) and voltage was 1.48v and i hit an absurd 83.8 degrees, i have my new cpu block en route, I'll give it a go but if no joy I'll buck up and get the 3950x

 

[wookiee87]

you don't think it could be down to the bios do you?, i updated my board from 0803 to 1302 over the weekend, and I've just disabled high precision event timer within device manager to see if that helps, online it says you can gain 5-8% and it may stop the temp spikes.

i'll have a play and report back

 

[wookiee87]

just noticing sat in windows on the desktop my cpu temp ramps up to 49 then back to 39 and keeps doing it over and over, its never a steady temp, every now and then around a minute it will ramp up to 59 degrees and go back to 49, 39, it keeps doing it

 

[wookiee87]

Could be something running in the background
Windows update, virus scanner etc
Use task manager to have a look

stuff is running but only around 0.3% of total cpu power with in task manager, firefox, msi afterbuner and a few windows background processes, would that be enough for a 10 degree jump every second?

 

[wookiee87]

right just rolled back my bois to 1201 and things seem to be better the max temp i'm seeing starting up destiny is roughly 13 degrees lower peak temp at 64 degrees, plus that's with a all core oc of 4.3ghz at 1.325v, im noticing that my ccd1 and ccd2 temps in hwinfo64 are 10 degrees diffrent ccd1 is at 53 degrees and ccd2 is at 63 degrees, correct me if i'm wrong but arnt the ccd's the chiplets? if so why is one hotter than the other?

 

[wookiee87]

CCD's are the chiplets.

I have a similar cooling setup as you and a 3900x. Did you want me to test anything for you?

3900x volicity block
1080ti eg block
2x 360 rads

do you have a temp difference on you ccd's like me or are you ok, i ran stock or under gaming load and noticed a good 10 degree difference between the two (ccd1 was around 10 degrees more than ccd2) i have a 4.4ghz all core clock and am running 1.33v to maintain that, good news rolling back my bios has stopped my chip going over 70 degrees now max i can see is around 68-69 under load which I'm fine with (compared with 83.8 degrees before)

 

[wookiee87]

that's good to know (not just me then ), mine sat idle now drops as low as 29 and the jumps i was getting seem to be more under control now only peaking up to around 37 and the odd 45 but not as bad as before, i have the new ek magnitude block en route so will give that a go and see if my load temps can be better, do you notice a huge leap in heat under load (1-2sec) or does your chip gradually creep up to its top temp? (10-15sec)

EDIT- i'm using soft tubing also, have 2 360mm rad's (ek pe classic) one for each part in pc (gpu and cpu / vrm's)

I'm folding now on my gpu and max temp with a overclock applied is around 50 degrees, cant seem to get work for the cpu to do but over the weekend i got lucky, and when i looked at temps they were in the mid 70's, that was after the bios roll back though, thinking about it it could've been the latest bios that caused my cpu spikes, i just hope i haven't damaged my chip

 

[wookiee87]

got the new bock installed and although load temps haven't really changed much (-5 degrees) idle spikes have completely disappeared and my cpu sits happily at 30 degrees at idle at 4.4ghz with 1.3v , gaming is better too my cpu in some cases sits just under 70 but mostly around 62-65 degrees which is a lot better, checked the old block and all seemed ok the fin array was clear and not damaged in any way.

could have been the latest bios that was the problem, I'll be sure to not update to the latest one next time

 

[wookiee87]

Which block did you go for?

ek's new magnitude am4 nickel/plexi £179.99 got one from ocuk luckily was only 3 in stock when i bought one (i had the ek velocity am4 block before)

 

[wookiee87]

I have the Velocity at the mo..180 notes is a lot for a block

yeah it is a lot of money but if you read up on them they are individually made from a single block of material, lot of RnD, especially the am4 blocks, they are made for the chiplet design of said chips