More radiators better cooling?

[Shadowman]

I basically have a i9 7900x a damn hot cpu currently being water cooled by a  EK XE 360 radiator with a overclock of 4.6GHz at 1.22 voltage. Am currently hitting 86c on Aida64 (CPU,Cache & FPU Stress) with room temp at 25c. My question is adding a 2nd radiator maybe a 420 will i improve on the load temps? I mean if it's like a 2c or 3c improvement i rather just leave it. I know idle cpu temps cannot drop below ambient temperature but my current idle temps are also in mid 30's to high 30's a bit high also.

[Vandorlot]

Try to get a 360/240 mm rad. Find the thickest one. And also try getting higher sp fans.

[ARikozuM]

The more radiators you add, the faster they can rid the absorbed heat from the loop and the longer it takes to reach the max loop temperature. 

[RadiatingLight]

Just now, ARikozuM said:

The more radiators you add, the faster they can rid the absorbed heat from the loop and the longer it takes to reach the max loop temperature. 

and also the maximum loop temperature will be lower

[ARikozuM]

Just now, RadiatingLight said:

and also the maximum loop temperature will be lower

Not necessarily, you're eventually going to get the loop temp to the same point once the rads are no longer able to diffuse more than what's added. 

[Shadowman]

8 minutes ago, ARikozuM said:

The more radiators you add, the faster they can rid the absorbed heat from the loop and the longer it takes to reach the max loop temperature. 

So around  what max temps should i be seeing if adding another radiator? currently as mentioned getting 86c

[ARikozuM]

3 minutes ago, Shadowman said:

So around  what max temps should i be seeing if adding another radiator? currently as mentioned getting 86c

You'll likely still get 86C, but you'll be extending the time it takes to get there. I would also make sure that you're getting good contact on the CPU and that your fans are appropriate for your radiators. 

[Shadowman]

13 minutes ago, Vandorlot said:

Try to get a 360/240 mm rad. Find the thickest one. And also try getting higher sp fans.

Any reason why i should not get a 420? was looking at the EK CE 420 if i do go for a 360 max thickness would have to be 45mm due to limitations of my case. So kinda become 420 or 360 same thickness of 45mm

[Shadowman]

6 minutes ago, ARikozuM said:

You'll likely still get 86C, but you'll be extending the time it takes to get there. I would also make sure that you're getting good contact on the CPU and that your fans are appropriate for your radiators. 

Extending by how much time? i currently hit 86c within 10 minutes.

[Shadowman]

The fans on the EK XE 360 are the Ek vardar fans 3000rpm but obviously not running them at 3000rpm  at 2100rpm at the moment

[RadiatingLight]

1 hour ago, ARikozuM said:

Not necessarily, you're eventually going to get the loop temp to the same point once the rads are no longer able to diffuse more than what's added. 

That's like saying that if you add more fins to a heatsink, it will only extend the time it takes to get to the same temp, which is obviously not true.

 

more rad space means lower temperatures. it's the same reason why a 120mm rad can't cool a CPU+GPU loop, but a 360mm rad can.

[RadiatingLight]

1 hour ago, Shadowman said:

Extending by how much time? i currently hit 86c within 10 minutes.

You'll be lowering temps

I can't tell you exactly by how much, but probably enough to comfortably use your CPU without being close to Tjunction, and maybe squeeze out an extra 100Mhz depending on how much more voltage you need.