[RTX4090 Gaming OC - EKWB Quantum Vector2] High Delta-T between GPU and Loop Temp

[Wireless G-Spot]

2x GTR 420mm HW Labs Rads, 2x D5 Pumps in series.

GPU is overclocked to 3000Mhz on the core, and +1000Mhz on the memory.  Power draw can push upwards of 520w, but usually bounces between 450w and 500w.  While playing World of Tanks, Ultra settings @ 5120x1440, I am seeing core temperatures of ~54c and a loop temperature of ~30c.  Memory Junction temp is ~46c, GPU hotspot ~64c.

 

Something I noticed when installing the EKWB was that it had a much worse design than my old water-block from OptimusPC(3080Ti).  By comparison the mounting pressure seemed piss fucking poor, and if my Delta-T is higher than it should be, could that be the culprit?  If it is the culprit, how do I go about fixing it?  It's not like I can increase the mounting pressure, it's poor performance in that regard is built into the design.

[SquintyG33Rs]

those numbers are all normal. the water never gets to what ever temp the heat components are at. heat only moves between the two BECAUSE there's a delta. bigger delta means better cooling too.

[Wireless G-Spot]

6 minutes ago, SquintyG33Rs said:

those numbers are all normal. the water never gets to what ever temp the heat components are at. heat only moves between the two BECAUSE there's a delta. bigger delta means better cooling too.

I've read elsewhere that a Delta-T of more than 15c is too high, but I wasn't sure if this was still considered accurate considering system wattage has increased substantially in the past decade.

[SquintyG33Rs]

2 minutes ago, Wireless G-Spot said:

I've read elsewhere that a Delta-T of more than 15c is too high, but I wasn't sure if this was still considered accurate considering system wattage has increased substantially in the past decade.

that's an insane statement... if you increase the delta in any way you're cooling your parts better. it would never have been true that's not how physics work.

it would make more sense in reverse. at least 15C delta. because if the delta is too small you're going to have problems either with the fluid or with the hardware having to throttle... but it doesn't make sense to give that kind of number.

 

things you should care about:

- hot components stay within their temp limits and don't throttle themselves so you get full performance

- your fluid won't last very long if it gets close to around 60C (water evaporates much faster, additives start separating...)

[AnonymousGuy]

That delta isn't that great.  At 700W I see 25C delta with my Alphacool block (and it's a linear relationship so 350W would have to be 12.5C unless it's a workload that is slamming the VRAM instead of the core).  It's not just mounting pressure it's also how much of an interference fit they design in to it.  With a really big die and too aggressive of an interference fit the base of the block can bow like / \ away from the die and cause shittier temperatures.

 

EK blocks suck IMO but I'll save that rant.  I wouldn't be that concerned about 55C core temperature where I'd be ripping stuff apart or replacing the block.  Just not worth it.