4090 waterblock temperature deltas

[momo56]

For the 4090 cards I was wondering what temperatures other people were getting for the core and fluid temperature.

My first block was a Phanteks G40. At 520W I was getting a 24/25 degree difference between the water temp and the core.
This block had a number of issues. The coldplate was bumpy from the machine marks. You could feel the grooves running your finger over it.

My 2nd block is from Barrow.
Getting a 17-19 degree delta at 520W. 24 degrees at 640W.

The coldplate was flat for the barrow and came with spring mounted screws so tension should be even.
I've done multiple attempts at mounting the block.

Pump is a DDC at 100% so flow isn't an issue.

For comparison my previous 3090 Suprim would only reach an 11 degree delta at 450W.

 

[Sc00p007]

I'd like to know some more results too.

After reading some others results for water, I'm unsure if I have a bad mount.

I can't provide water temps.

My rad space is 2x360 + 1x240, 4090 and 5950x sharing the same loop.
For the following, my fans were running at 1200rpm:
At a 3hr sustained wattage of between 400-470w I see a peak temp of 56@470w, average 50@410w

For reference, my 3090 @ 3hr sustained 400w was the same at 50degrees.

Does that seem ok?

 

[OC2000]

For the 4090 cards I was wondering what temperatures other people were getting for the core and fluid temperature.

My first block was a Phanteks G40. At 520W I was getting a 24/25 degree difference between the water temp and the core.
This block had a number of issues. The coldplate was bumpy from the machine marks. You could feel the grooves running your finger over it.

My 2nd block is from Barrow.
Getting a 17-19 degree delta at 520W. 24 degrees at 640W.

The coldplate was flat for the barrow and came with spring mounted screws so tension should be even.
I've done multiple attempts at mounting the block.

Pump is a DDC at 100% so flow isn't an issue.

For comparison my previous 3090 Suprim would only reach an 11 degree delta at 450W.

That sounds about right.

500W heat output on the 4090 is equivalent around 900W on a 3090

 

[Sc00p007]

Just an update.
I was originally using the inlet/outlet the opposite way due to EK saying there is negligible difference and it made my tubing look nicer.

Well, I just installed a new cpu and used it as an opportunity to swap the inlet/outlet. It has knocked 5-6 degrees off my gpu temps.

410w on old config was 50degrees, now bouncing between 44-45degrees.