Geothermal cooled 3080 power limit

[Bertman]

Hi all. I have decided to get advice from the experts on this. I have buried 250 feet of 3/4 pex tubing and am cooling my 5950x and my Gaming Z Trio 3080 with it. My GPU temps never exceed 44c. I am at +180 on the core clock and 875 on the memory clock. I have pretty much reached my power limit. Should I call my setup good or maybe flash my bios to enable a higher power limit? I'm only 163 points from 20k in Firestrike and it's wearing at my brain.

 

[Count von Schwalbe]

Hi all. I have decided to get advice from the experts on this. I have buried 250 feet of 3/4 pex tubing and am cooling my 5950x and my Gaming Z Trio 3080 with it. My GPU temps never exceed 44c. I am at +180 on the core clock and 875 on the memory clock. I have pretty much reached my power limit. Should I call my setup good or maybe flash my bios to enable a higher power limit? I'm only 163 points from 20k in Firestrike and it's wearing at my brain.

Geothermal cooling?

You sir are a dedicated enthusiast.

Anyways, I would say your cooling could certainly handle it, but crossflashing Ampere is a minefield. @eidairaman1 is our resident VBIOS expert though.

 

[Bertman]

It was mainly an experiment that happened to work out. I have about 500 in it all. I have a backhoe which obviously helps. My flow rate is 4 liter/min. The water loop pic is pre-gpu block.

 

[Steevo]

So what happens at higher clock speeds, or it just won't boost to.those speeds?

 

[Bertman]

I cant get it to boost but a couple past 2200

 

[joemama]

Looks like most 3080 GPUs max out at 450W while yours is at 380W, it would be beneficial you could flash the gpu and reach 450W but flashing the vbios is always a risk

 

[Bertman]

What bios should I try? I've read the Suprim bios might have a higher limit. My card has 3 8pin connectors so I think I have the capability to go higher

 

[eidairaman1]

What bios should I try? I've read the Suprim bios might have a higher limit. My card has 3 8pin connectors so I think I have the capability to go higher

Get a gpu-z screenshot, then go to advanced tab and select memory timings on the context menu, screenshot it

 

[Bertman]

Here it is. I can't find the memory timings. I'm looking

 

[eidairaman1]

Geothermal cooling?

You sir are a dedicated enthusiast.

Anyways, I would say your cooling could certainly handle it, but crossflashing Ampere is a minefield. @eidairaman1 is our resident VBIOS expert though.

Looks like most 3080 GPUs max out at 450W while yours is at 380W, it would be beneficial you could flash the gpu and reach 450W but flashing the vbios is always a risk

Which specific card is it?

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Here it is. I can't find the memory timings. I'm looking

Not all cards report it

From the Device ID and Subsystem ID this is your card.

MSI RTX 3080 VBIOS

12 GB GDDR6X, 1260 MHz GPU, 1188 MHz Memory

www.techpowerup.com

Target is 390W and Limit is 400

Since it is LHR and 12G, try this verified bios.

But bear in mind you must have a backup plan.

MSI RTX 3080 VBIOS

12 GB GDDR6X, 1260 MHz GPU, 1188 MHz Memory

www.techpowerup.com

Flash guide

 

[lexluthermiester]

You sir are a dedicated enthusiast.

That's an understatement!

It was mainly an experiment that happened to work out. I have about 500 in it all. I have a backhoe which obviously helps. My flow rate is 4 liter/min. The water loop pic is pre-gpu block.

That is some serious next-level cooling engineering!

 

[Bertman]

Bios flash went perfectly. Thank you. My initial results are promising. 19,944 on timespy

 

[Lei]

It was mainly an experiment that happened to work out. I have about 500 in it all. I have a backhoe which obviously helps. My flow rate is 4 liter/min. The water loop pic is pre-gpu block.

What are the pipes made of, how many meters, inner diameter, coolant total volume, how deep under the ground?
what are temps after 5 hours of heavy load? regarding you have no fans and rads, I suspect a raise in temp over time.

 

[Bertman]

The pipes are pex tube. Outer diameter is 3/4. Inner is .681 inch. 76.2 meters in length in coils. It's approximately 7 feet underground. Theres around 4.5 gallons of distilled water in the loop. I ran a stress test overnight and my cpu temp held at 64c. There's just so much surface area that it can't be overwhelmed by something so small.

 

[Bertman]

Broke 20k! Thank you guys for the replies. Couldn't have done it without you.

 

[Fangio1951]

It'll be interesting to see what the difference will be regarding your climate - are you in winter or summer now ??

 

[Lei]

ID 1.73 cm
tubing inner volume 18.54 liters, hmm why just 4.5 gallons, even without reservoir that would leave 1.5 liters of air inside the tubes.

tube surface area 4.548 m²
alphacool 560 (Quad 14cm fan) surface area 0.24 m² (56 length x 1.5 thickness x (14 rows x 2 sides))
copper thermal conductivity 401 wmk
pex 5.7 wmk

you have 4.548/0.24=18.95 times more (17.58 times more for inner tube) surface area than my radiator, but your pex thermal conductivity is 70 times weaker than copper.

So tell me where am I wrong? the earth is wet? why don't u use 70 times shorter copper tubing instead?
I use 5 gallons, but mostly in reservoir. most of times fans are unplugged and this is the rad

The pipes are pex tube. Outer diameter is 3/4. Inner is .681 inch. 76.2 meters in length in coils. It's approximately 7 feet underground. Theres around 4.5 gallons of distilled water in the loop. I ran a stress test overnight and my cpu temp held at 64c. There's just so much surface area that it can't be overwhelmed by something so small.

what thermal paste, room ambient temp, and what's the temp of your distilled water.
is your gpu idle cooler than ur western digitals?
Thanks

 

[joemama]

ID 1.73 cm
tubing inner volume 18.54 liters, hmm why just 4.5 gallons, even without reservoir that would leave 1.5 liters of air inside the tubes.

tube surface area 4.548 m²
alphacool 560 (Quad 14cm fan) surface area 0.24 m² (56 length x 1.5 thickness x (14 rows x 2 sides))
copper thermal conductivity 401 wmk
pex 5.7 wmk

you have 4.548/0.24=18.95 times more (17.58 times more for inner tube) surface area than my radiator, but your pex thermal conductivity is 70 times weaker than copper.

So tell me where am I wrong? the earth is wet? why don't u use 70 times shorter copper tubing instead?
I use 5 gallons, but mostly in reservoir. most of times fans are unplugged and this is the rad


what thermal paste, room ambient temp, and what's the temp of your distilled water.
is your gpu idle cooler than ur western digitals?
Thanks View attachment 250979

I would assume that he just went with pex tubes since it was soft and easier to handle.
For this cooling method you're dissipating heat into solid dirt rather than air like normal radiators which has a higher heat conduction so fans aren't really that important.

 

[Selaya]

It'll be interesting to see what the difference will be regarding your climate - are you in winter or summer now ??

it's buried 7 feet underground for a reason.

 

[Blaeza]

Broke 20k! Thank you guys for the replies. Couldn't have done it without you.

Well done! I'm a total amateur, but couldn't you oc your ram a bit more for even more blazing speed?

 

[SL2]

So tell me where am I wrong? the earth is wet? why don't u use 70 times shorter copper tubing instead?

I'm not arguing with the math, but the thought of a 1,1 m long copper tube that would cool just as good as the OP sounds too good to be true.

If it actually would work it's a lot less digging!

 

[Selaya]

idt that'd work, at some point you'll heat up the earth enough for it to no longer be able to dissipate the heat you generate. thermal density matters. going for the highest thermal conductivity isnt necessarily always the right choice.

also, copper tarnishes so yeah hf gl w/ that.

 

[Outback Bronze]

WOW!

 

[Lei]

I would assume that he just went with pex tubes since it was soft and easier to handle.
For this cooling method you're dissipating heat into solid dirt rather than air like normal radiators which has a higher heat conduction so fans aren't really that important.

may be (401/5.7)/18.95=3.712
he can replace the pex with roughly 4 meters of copper buried in earth to get the same result. and his pump will run quieter + less digging

I'm not arguing with the math, but the thought of a 1,1 m long copper tube that would cool just as good as the OP sounds too good to be true.

If it actually would work it's a lot less digging!

4 meters

but I agree with Selaya

pex lower wmk has the bonus of more surface area.

idt that'd work, at some point you'll heat up the earth enough for it to no longer be able to dissipate the heat you generate. thermal density matters. going for the highest thermal conductivity isnt necessarily always the right choice.

I agree, it makes sense.
may be on a wet planet, we can bury the radiator under the ground. or just throw the rad in a river

 

[Count von Schwalbe]

idt that'd work, at some point you'll heat up the earth enough for it to no longer be able to dissipate the heat you generate. thermal density matters. going for the highest thermal conductivity isnt necessarily always the right choice.

also, copper tarnishes so yeah hf gl w/ that.

I doubt you could heat the earth up with a PC

Seriously though, unless op lives in a desert, any ground moisture will pull that heat right out. Commercial geothermal HVAC loops are made of HDPE, similar (thermally) to PEX.