Want to get a 4090 - PSU concerns?

[asdrubalex]

Hi guys,

I'm planning on getting a 4090 just because I'm upgrading from a 1060 and I want to future proof the build a bit at 4k / 1440

The overall build will be i9 13900 KF / ASUS TUF GAMING ZS90 PLUS / 128 GB ddr 5 ram 4800 MHZ

2 x 2TB SSD - for cooling i've got artik thermal paste and deepcool ak620 dual tower CPU cooler and 2 Extra Case Fans. I'll also get braided cables to improve air flow

My only overall concern is the PSU - on offer for this build is the corsair 1000W RMX series - MODULAR 80 Plus gold - Is this good enough / recent enough for the GPU? are there concerns on the connectors etc?

is there anything here that is overkill or underkill that i should think about?

Thanks!


Amedeo

 

[Hyderz]

u dont need 128GB ram... its overkill for gaming you be better off getting a 32gb(2x16) or 48gb(2x24) faster kit.
1000w with 80 plus gold is good enough, you just gotta make sure it is seated properly and its overly bent for the connectors the gpu...

 

[wolf]

The 1000W PSU you propose should be plenty. Both major energy consuming components, the 4090 and 13900KF can be very power hungry when pushed to their limit, but a 1000W should still handle them both comfortably.

And in typical usage scenario's, assuming it's a gaming focussed build, while gaming you likely won't see the CPU pulling near it's power limit, and even the 4090 bucks several generations worth of trend where Nvidia cards are virtually always continually right at their power limit when GPU limited, the 4090 doesn't just pull 450w all the time, often it's in the 300-425w range which is highly dependant on the game/workload.

Also, I'd highly recommend undervolting both to push them more into an efficiency sweet spot rather than how they are configured by default, where you likely will lose 0-3% of max performance for significant gains in efficiency, lower power draw, and consequently less heat output.

I'd also go for less RAM, but faster RAM, personally.

 

[kapone32]

There is a MSI Gaming live Stream that uses those parts and they showed that a 13900KF paired with a 4090 can pull over 1000 Watts from the Wall. A 1300 Watt PSU would be my choice for a system like that.

 

[asdrubalex]

The 1000W PSU you propose should be plenty. Both major energy consuming components, the 4090 and 13900KF can be very power hungry when pushed to their limit, but a 1000W should still handle them both comfortably.

And in typical usage scenario's, assuming it's a gaming focussed build, while gaming you likely won't see the CPU pulling near it's power limit, and even the 4090 bucks several generations worth of trend where Nvidia cards are virtually always continually right at their power limit when GPU limited, the 4090 doesn't just pull 450w all the time, often it's in the 300-425w range which is highly dependant on the game/workload.

Also, I'd highly recommend undervolting both to push them more into an efficiency sweet spot rather than how they are configured by default, where you likely will lose 0-3% of max performance for significant gains in efficiency, lower power draw, and consequently less heat output.

I'd also go for less RAM, but faster RAM, personally.

thanks all! what about 96 gb ram 5200 mhz?

yes, i don't intend to do any overclocking at all - just normal use.

i've never configured undervolting so that's something i'll have to learn!! how much should they be undervolted by?

(i mean i don't know what people here think but should i even consider going 4080 for 4k 1440? is there really a big gap? what are the general thoughts?

 

[Hyderz]

thanks all! what about 96 gb ram 5200 mhz?

yes, i don't intend to do any overclocking at all - just normal use.

i've never configured undervolting so that's something i'll have to learn!! how much should they be undervolted by?

(i mean i don't know what people here think but should i even consider going 4080 for 4k 1440? is there really a big gap? what are the general thoughts?

no you dont need 96gb.... for normal use...

 

[GerKNG]

Your PSU would be 100% fine.
This PSU ran my 4090 GS at max voltage and power at 500W at a tad over 3Ghz. And that's with two 8 Pins (daisy chained)
and all of that with an overclocked 13700k and it ran 100% stable. (the transients of a 4090 are lower than the transients of any high end RDNA2 Card.)
buy yourself a nice 6000 CL30 32GB Kit and call it a day. you don't need more than 32GB of RAM except if you plan to turn this PC into a massive workstation that renders 24/7.

 

[wolf]

thanks all! what about 96 gb ram 5200 mhz?

I'd personally be looking at around 5600 to 6400mhz, and even 64gb is absolutely overkill for a gaming build, imo speed here trumps excessive capacity.

Ive never configured undervolting so that's something i'll have to learn!! how much should they be undervolted by?

There are plenty of YouTube videos, even ones specific to the 4090 and likely Intel's 13th gen, there are a few schools of thought though

Undervolt slightly to retain stock performance and lower power consumption a little
Undervolt more aggressively, losing a few % performance but more drastically reduce power consumption.
Undervolt VERY aggressively and lose 10-15+% performance but with massive drops in power consumption

(i mean i don't know what people here think but should i even consider going 4080 for 4k 1440? is there really a big gap? what are the general thoughts?

I think at current prices thr 4080 doesn't make a heap of sense, may as well go 4090 and either target 4k or possibly 1440p for many years to come

 

[Darkholm]

Biggest concern for purchasing 4090 is its 12VHPWR connector and cable/adapter which is used for power connection.

https://www.reddit.com/r/pcmasterrace/comments/14o6w1e

 

[asdrubalex]

thanks guys! (yes my worry is about the connector specifically)

I'll get less ram but faster, thanks for advise on this.

can i get away with dropping the GPU to the Intel® Core™ i7 16-Core Processor i7-13700K (Up to 5.4GHz) 30MB Cache? or do i need an i9 to make the most of the GPU?

 

[Darkholm]

i7 13700K and i9 13900K are basically the same CPU. Both have same count of performance cores 8c/16t. Only difference is clock (+200~400MHz) and "Cinebench accelerator" cores (+8). 13900K is more hungrier and hotter, so it would be recommended to get 13700K.

 

[asdrubalex]

am i also ok with the Intel 670p 2TB M.2 PCIe 3D NVMe SSD/Solid State Drive? 3500 mbs read?

 

[Darkholm]

Yes.

 

[TechHalp]

Why would you ever need that much ram for normal use... The PSU is fine.

The M.2 drive is terrible as well... Spend the money on that, get less ram. The WD 1 TB drive is 7200 mb/s and cheap

 

[ir_cow]

I know this is a thread for a PSU, but don't go with 128GB unless you need that much memory. Best to stick with 2 DIMMs. Using that Z690 TUF will limit you memory choices. Also needs a BIOS update to support 24GB DIMMs.

 

[dgianstefani]

Get a ATX 3.0 PSU with 8 pin connectors at the PSU side, so it's compatible with ATX 3.1 spec.

Go for 64 GB of Hynix A die memory running at 7200 MT.

Don't buy a KF CPU, get the normal K, the iGPU is useful as a backup and for certain tasks that it accelerates.

A two DIMM motherboard or Mini ITX (which are all two DIMM) will offer better memory performance, allowing you to run both higher capacities and higher speed.

Get a Z790 board.

For a high wattage 13900K (1-300 W) and 4090 (4-500 W) build, you want to max out PSU efficiency to reduce waste heat dumped into case.

At 800 W load an 80+ gold will have 80-100 W of waste heat from voltage conversion losses.
At 800 W load an 80+ titanium PSU will have 50-80 W of waste heat.

Better PSUs also deliver cleaner power and can sometimes lead to better OC potential.

If you're investing heavily on a 13900/4090 build, consider spending the money you would have spent on 128 GB of RAM, on 64 GB of much faster RAM, and a good set of case fans. Noctua NF-A12x25 or Phanteks T30 are both good options.

 

[TechHalp]

Getting an ATX 3.0 PSU is the most superficial, shallow waste of money you could possibly spend. Currently using a 4090 with a 1000w PSU with no issues whatsoever.

Not only should PSU heat never be emptied into your case, because the vent is literally separate, 4090 coolers are overdone and have no issue keeping the card temps down.

You definitely don't need 64 gb of DDR5 memory for gaming, that's insane.

Not only that, those connectors still burn out, it's not even safer lmao. Dgian is completely detached from reality and the value of money.

 

[dgianstefani]

Biggest concern for purchasing 4090 is its 12VHPWR connector and cable/adapter which is used for power connection.

https://www.reddit.com/r/pcmasterrace/comments/14o6w1e

Cablemod use the inferior type of metal contacts within the connector. Use the stock cables, plug them in fully, and you'll be fine.

Don't buy a 670p, it's old QLC, bad drive.

Go for two SN770s or something from our SSD reviews.

TechPowerUp

www.techpowerup.com

i7 13700K and i9 13900K are basically the same CPU. Both have same count of performance cores 8c/16t. Only difference is clock (+200~400MHz) and "Cinebench accelerator" cores (+8). 13900K is more hungrier and hotter, so it would be recommended to get 13700K.

13900K/KS have additional L2 cache that is beneficial for ST performance as well. It's a good choice.

3 Dimple connectors such as Cablemod cables are one of the root causes of the faulty 12VHPWR, they're not in spec.

You definitely don't need 64 gb of DDR5 memory for gaming, that's insane.

FYI, certain games such as MS Flight Simulator or Tarkov for example are already running into the limits of 32 GB, especially if streaming or having common software open in the background. There's nothing wrong with going for 64 GB, especially as most people do more things with their PC than just game .

 

[Darkholm]

Cablemod use the inferior type of metal contacts within the connector. Use the stock cables, plug them in fully, and you'll be fine.

Don't buy a 670p, it's old QLC, bad drive.

Go for two SN770s or something from our SSD reviews.

TechPowerUp

www.techpowerup.com

13900K/KS have additional L2 cache that is beneficial for ST performance as well. It's a good choice.

3 Dimple connectors such as Cablemod cables are one of the root causes of the faulty 12VHPWR, they're not in spec.

View attachment 303774

So I have heard. In my case, there is Seasonic 12VHPWR cable and it is great. Although I do not have 4090, only 4080 so don't know is it also great for 4090, probably is.