Question 3090 to 4090 - fan config and PSU advice

[4090upgrade]

Hi guys

I am upgrading an air cooled 3090 (Rog Strix OC) to a liquid cooled 4090 (Suprim X). I have a Corsair 1000W RMx. My 12900KS cooled by an AIO 3 fan rad, so the entire set up runs pretty hot particularly as the CPU is OC a fair amount.

My case currently has

3x I front
3x I side
1x E rear
3 E top through CPU AIO rad

So net balance 6I 4E

I am going to put the new GPU rad down the side, with the fans on the rad exhausting out of the case, and also swap round the rear E to be an I, so the new net balance would be 5I 5E.

Am I better off, do you guys think

1) Removing two of the side fans to accomodate the new GPU rad

(net 5I 5E)

or

2) Swapping two of the side I's around so they are E, then mounting the new rad on top of them, so there are built in fans pushing through the radiator from the case and then the original 2 pushing that air outside, almost like pushing through the rad on one side and then sucking it from the other side to exhaust it outside? Is that possible?

With how heat rises and with how there are 3 E on the top and 3 I at the front, would the new rad be better off occupying the bottom 2 side fan 'spots', or the top 2?

Additionally, what do you guys reckon about powering the new GPU - I understand it wouldn't be a straight swap with the existing cables and I'd have to run a new 12VHPWR cable to my modular PSU - I understand some people don't plug these in though depending on their PSU - is 1000W sufficient to plug all 4 cables into the new 4090?

Additionally, before I stick the existing 3090 on ebay, if there is anyone UK based on here interested in acquiring a well looked after 16 month old 3090, please drop me a PM.

Cheers

 

[stefanos50]

You can either use the included adapter that will come with your GPU that splits into 3 or 4 normal 8-pin PCI-E connectors or since you have an RMx PSU you can purchase a cable from corsair that directly connects to the PSU https://www.corsair.com/us/en/p/pc-...-5-12vhpwr-600w-cable-type-4-white-cp-8920332. The second option will save you a lot of space and make cable management easier. 1000W should be enough for an RTX 4090 i run mine with an HX850 Platinum for a while now.

 

[4090upgrade]

Thanks man.

Sorry but I'm a little unsure with the PSU stuff as I don't want to run into the melting cable disaster some people have had.

My 3090 currently has 3x 8 pin power inputs.

The new 4090 has a singular 12VHPWR input 'jack'.

There should be an included adapter in the box that will connect the 3x existing cables into this new singular input.

To use the card's full potential however, i.e. by supplying it with over 600w, I would have to run a new 8 pin cable from a currently empty slot on the PSU to that 4th 'head' on the adapter?

 

[XxDarkMario20xX]

Just a question whats your reason for upgrading to 4090

 

[4090upgrade]

Just a question whats your reason for upgrading to 4090

Significantly better performance in the applications I use due to now being able to access DLSS, + being able to get a fair chunk of the cost back via selling the 3090, + the stat based perf upgrades below

 

[stefanos50]

Thanks man.

Sorry but I'm a little unsure with the PSU stuff as I don't want to run into the melting cable disaster some people have had.

My 3090 currently has 3x 8 pin power inputs.

The new 4090 has a singular 12VHPWR input 'jack'.

There should be an included adapter in the box that will connect the 3x existing cables into this new singular input.

To use the card's full potential however, i.e. by supplying it with over 600w, I would have to run a new 8 pin cable from a currently empty slot on the PSU to that 4th 'head' on the adapter?

Some 4090 come with an adapater that splits to 4 PCI-E cables and other with 3 (mostly the more budget options). Each 8pin can provide 150W of power so 4*150=600W. Most PSU cables split into two 8 pins. NVIDIA recommends using distinct cables for the PSU to plug them into the adapter and not two cables that split into two. However, you pay 2.000$+ for a single GPU buing a new PSU cable for extra 30$ i guess should not be a problem. Its rated for 600W and will use only 2 8-pin (type-4) of your modular PSU. You are buying a water cooled version so it will probably come with an adapter that splits to 4-PCI-E cables so to get the full performance or overclock you have to connect all the connectors.

 

[Phaaze88]

You should experiment on the AIO configuration, if you're curious enough.

Gpu AIOs don't have the same resale value as an air cooled one, so try to keep that in mind when moving up from that one later.

 

[4090upgrade]

Some 4090 come with an adapater that splits to 4 PCI-E cables and other with 3 (mostly the more budget options). Each 8pin can provide 150W of power so 4*150=600W. Most PSU cables split into two 8 pins. NVIDIA recommends using distinct cables for the PSU to plug them into the adapter and not two cables that split into two. However, you pay 2.000$+ for a single GPU buing a new PSU cable for extra 30$ i guess should not be a problem. Its rated for 600W and will use only 2 8-pin (type-4) of your modular PSU.

Thanks mate.

Having watched some unboxing vids the Suprimcomes with a 4 split. I've read the manuals on MSI's website but they really could not be any less detailed if they tried.

Someone else built my system so I'm not too sure how it looks behind the cable hiding trim bits. It looks like they pulled a few extra cables through when they pulled through the power for the GPU but they aren't complete 8 pin connecters, it looks like 3x 2 pin connectors.

GPU

Pull through

In relation to the new cable required, I notice on the GPU that the config seems to be a 6 pin connector with a seperate 2 pin connector on the side, making 8. (x3)

I have this cable spare from the supply that came with the PSU, it is branded CPU. Will it do the job instead of the 6+2 arrangement? So plug the original 3 into the adapter, then plug this new one into the PSU and the 4th spot on the adapter, then plug the adapter into the new card?

 

[4090upgrade]

You should experiment on the AIO configuration, if you're curious enough.

Gpu AIOs don't have the same resale value as an air cooled one, so try to keep that in mind when moving up from that one later.

Thanks.

Do you mean in terms of the proposed push/pull idea mounting the new rad on the existing side fans, turning them round to exhaust? Do you think that's a good idea?

Resale - noted, cheers.

 

[Phaaze88]

Do you mean in terms of the proposed push/pull idea mounting the new rad on the existing side fans, turning them round to exhaust? Do you think that's a good idea?

It's all speculation until you actually try Plan A/B/C/etc., and compare their differences. If that much isn't done, no one will be the wiser.
What you see isn't always what you get.

I think that side exhaust and top exhaust will fight for some air, but see, I'm just speculating. I can't prove it, since I'm not there.