Tried undervolting or lowering power limit & clocks?
why dont you just opt for another gpu, doesn't have to be anything fancy with rtx features, looking at your current card (r9 390x) your best bet would be to look at second hand gtx 1070's, keep looking at the bay or mm here, if one comes up for a decent price snap it up.
with how your aio is setup i'd proberly look for a blower style card that way most of the heat is vented from your case
performance wise compaired to your card you should see a 40% increase in performance, plus the card shoudn't run anyware near what the 390x does temp wise
What temps are you hitting and at what fan speed?
You say it's ok with the side case off? As you've worked out it seems your simply not getting enough cool air in, not surprising with a closed front case.
Do you run afterburner? Undervolting shouldn't lose you performance AMD always seem to overvolt at stock for some reason.
I even do it on my Titan, I run 1950Mhz @0.95v compared to something like 1.03v at stock.
@ OP I stated this in another thread (some got upset) but the new cases that are nearly all the same like yours (most have glass side and RGB) and the with the front nearly solid with 120mm (140mm fans if you are lucky) are not as good airflow as the older style big cases with 200mm fans (I kept my Phantom 630 for this very reason).
There is not one of the NZXT style cases today I would use.
40% increase with a 1070?
No, not tried any of that. I need as much power as possible so don't want to down clock it.
Thanks all, a different GPU is the way to go. I used to run everything locked at 60fps on 1920x1080, but since going higher res and refresh, it's nice to make use of it.
I browse the MM, but never really know how much better something is to the 390x.
I'll be wise to stick with AMD as the monitor is Freesync compatible
So I'm experience problems of my GPU hitting thermal throttle. I'm not sure what to do next. The only way it'll run OK is with the side of the case off.
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NZXT S340, H100 CPU cooler with 4x Noiseblocker PL-2 fans running full speed.
Standard NZXT exhaust fans, one rear, one top.
The Noiseblocker fans are 96m3/h which is 56cfm. I haven't seen many fans more powerful than that https://www.blacknoise.com/datas/downloads/datasheets/TData_BSP120_122012_de_en.pdf
I've either got to find another way to cool the old 390x, or increase air flow within the case.
I did think about finding a better case, but it needs to be small and full ATX.
Any suggestions please?