EVGA_Lee
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Re: Debating if I need a new PSU for 4080/4090
2022/10/05 03:08:31
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If an adapter comes with X number of connectors, then you'll need to use X number of connectors from the power supply. If that means using a "pigtail" from your existing cables that came with your power supply, that should be OK. Usually, there's a sense pin between all the different wires to make sure that all of them are connected before the card will get an OK to turn on at boot. Either way, NVIDIA gives the minimum required PSU at 850W for the 4090, so I would at least give your PSU a shot before considering the need to upgrade. NVIDIA also notes that the adapter should require 3pins, not 4.
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b3l13v3r
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Re: Debating if I need a new PSU for 4080/4090
2022/10/05 12:06:55
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I'll toss in a consideration in terms of power and OC... why aren't more people talking about undervolting with these monsters? Currently I'm running an EVGA 1000 T2. I'm currently running a 12900K @5.2/4.2 all core Vcore 1.35 pulling up to 150W, memory @6800MT tight timings and running under 1.45v and a 3090 Ti FTW3 Ultra @2025 undervolted to 915mV on a DARK KP motherboard. It floats just above that with the vbios switch on the card in the OC position at up to 925mV. So under max load, the GPU only draws about 370W with no spikes like it does when not managing the voltage. So,the whole system, with all the watercooling gear and fans, will take the total wall draw to 750W give or take. But gaming loads are typically in the high 600's to low 700's.  Keeps the system MUCH cooler and is close to what I was drawing on X299, 9800X, 1080 Ti in SLI, OC'd memory with no voltage management. Hope it helps...
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EVGA_Lee
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Re: Debating if I need a new PSU for 4080/4090
2022/10/05 12:18:02
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b3l13v3r
[...]
So,the whole system, with all the watercooling gear and fans, will take the total wall draw to 750W give or take. But gaming loads are typically in the high 600's to low 700's.
[...]
Given a rough estimate of 80Plus Titanium efficiency, that means the system is pulling just under 700W between the components and anything else you have connected before your wall tester.
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b3l13v3r
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Re: Debating if I need a new PSU for 4080/4090
2022/10/06 13:31:35
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That sounds right. My readings were from a Cyber Power 1500VA LCD. I’ve seen a few higher wattage readings in the high 700’s. But I don’t know what to make of that.
post edited by b3l13v3r - 2022/10/06 13:45:42
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atfrico
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Re: Debating if I need a new PSU for 4080/4090
2022/10/11 12:33:06
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I would say go 1600w that 4090 looks a wattage eater 4 sure😥
If not talk to Doc Brown, a flux capacitor will help 🤣🤣
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donta1979
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Re: Debating if I need a new PSU for 4080/4090
2022/10/11 12:40:43
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atfrico
I would say go 1600w that 4090 looks a wattage eater 4 sure😥
If not talk to Doc Brown, a flux capacitor will help 🤣🤣
a 1200-1300w will be more than enough for a retail 4090 coming out and any cpu, if they want to think of the 4090 TI they may want to take the 1500-1600w psu route on a none ATX 3.0/PCIe 5.0 psu. If they never want to see the psu stressed at all yup same story it will maybe use 70% total of its total power on a 1500-1600w and that is not being generous of an overshoot. System builders are seeing with amd's latest and greatest, intel's 12th gen to 13th gen and amd threadripper anywhere from 1000+ watts total system draw in benches and gaming. So some are being honest and saying recommended minimum 1200w. Only way nvidia got that 850w minimum is they used an i5 to i7 or AMD's equivalent on power draw or tossed it in a hot alienware pc...
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808sting
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Re: Debating if I need a new PSU for 4080/4090
2022/10/11 17:34:02
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In GN's review, a vague graph shows a 33% OC on a FE edition drawing >600w. Wonder how the AIBs are handling power limits and cooling for GPU boost.
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kougar
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Re: Debating if I need a new PSU for 4080/4090
2022/10/11 17:50:56
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b3l13v3r
I'll toss in a consideration in terms of power and OC... why aren't more people talking about undervolting with these monsters?
Der8auer did power target testing with a 4090, the card could easily handle a 33% lower power consumption for just a 10% drop in perf. These cards are already aggressively NVIDIA overclocked well outside the perf/watt curve for no real reason. All the power hype was overblown, multiple reviewers have shown that the 4090 draws less power than a 3090 TI and GN showed the worries about 2-3x power spikes don't exist either.
 Have water, will cool.
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b3l13v3r
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Re: Debating if I need a new PSU for 4080/4090
2022/10/12 22:09:24
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