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Ampere gpu question I've heard nobody ask?

Leon86
By Leon86
in Graphics Cards
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So I've seen recommendations on the psu required for these new nvidia gpus, now I have a antec 1200w psu and it is a old psu and trust it 100%. I currently have a gigabyte gtx 780 windforce, so also old. It has a custom bios a pulls 425w by it self due to the overclock, so heres my question.....

 

What 12v rail amps are required for a 3090? 

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3 minutes ago, Leon86 said:

now I have a antec 1200w psu and it is a old psu and trust it 100%

Trust is not a factor, power supplies often die spontaneously and with no warning signs. If you're rocking a 7 or 8 year old psu, even if it's a really good one, time to consider an upgrade, especially for a GPU the likes of a 3090

I WILL find your ITX build thread, and I WILL recommend the SIlverstone Sugo SG13B

 

Primary PC:

i7 8086k - EVGA Z370 Classified K - G.Skill Trident Z RGB - WD SN750 - Jedi Order Titan Xp - Hyper 212 Black (with RGB Riing flair) - EVGA G3 650W - dual booting Windows 10 and Linux - Black and green theme, Razer brainwashed me.

Draws 400 watts under max load, for reference.

 

How many watts do I need? ATX 3.0 & PCIe 5.0 spec, PSU misconceptions, protections explained, group reg is bad

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4 minutes ago, Fasauceome said:

Trust is not a factor, power supplies often die spontaneously and with no warning signs. If you're rocking a 7 or 8 year old psu, even if it's a really good one, time to consider an upgrade, especially for a GPU the likes of a 3090

I was looking at a new one. Wanted some sort of corsair one. Fully modular and with usb link

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All components have operating shelf lives. If your PSU is old, get a new one. Don't put your entire system in jeopardy for saving a few hundred bucks.

PC: Acer Predator Helios 300: corei7-7700HQ, GTX 1050Ti 4GB, 8GB DDR4 2400MHz, 128GB SSD+1024GB HDD, Logitech G102 Prodigy+Circle Gaming Pro.

 

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2 minutes ago, Leon86 said:

I was looking at a new one. Wanted some sort of corsair one. Fully modular and with usb link

A proper 650 watt PSU with your typical gaming cpu would do the trick, the 3090 is rated for 350 watts.

I WILL find your ITX build thread, and I WILL recommend the SIlverstone Sugo SG13B

 

Primary PC:

i7 8086k - EVGA Z370 Classified K - G.Skill Trident Z RGB - WD SN750 - Jedi Order Titan Xp - Hyper 212 Black (with RGB Riing flair) - EVGA G3 650W - dual booting Windows 10 and Linux - Black and green theme, Razer brainwashed me.

Draws 400 watts under max load, for reference.

 

How many watts do I need? ATX 3.0 & PCIe 5.0 spec, PSU misconceptions, protections explained, group reg is bad

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Yeah I had pretty much made my mind up to get a new one, but I'd be more comfortable knowing what amps is need on the 12v rail for these new gpus. I've been stung before with this current gpu. Brought the recommend wattage actually was over on the wattage, still didn't display on hdmi, had to look up the amps and get appropriate psu

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14 minutes ago, Leon86 said:

What 12v rail amps are required for a 3090? 

We know the new connector is rated to 300W and is 12V. Apply Ohm's law and you get 25A.

Main system: i9-7980XE, Asus X299 TUF mark 2, Noctua D15, Corsair Vengeance Pro 3200 3x 16GB 2R, RTX 3070, NZXT E850, GameMax Abyss, Samsung 980 Pro 2TB, Acer Predator XB241YU 24" 1440p 144Hz G-Sync + HP LP2475w 24" 1200p 60Hz wide gamut
Gaming laptop: Lenovo Legion 5, 5800H, RTX 3070, Kingston DDR4 3200C22 2x16GB 2Rx8, Kingston Fury Renegade 1TB + Crucial P1 1TB SSD, 165 Hz IPS 1080p G-Sync Compatible

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2 minutes ago, porina said:

We know the new connector is rated to 300W and is 12V. Apply Ohm's law and you get 25A.

Isn't the new connector 2 8 pins joined? So thats twice the 12v rails?

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6 minutes ago, Leon86 said:

Isn't the new connector 2 8 pins joined? So thats twice the 12v rails?

By the adapter cable, yes it is from two 8-pin connectors. If we assume they are evenly split, and your PSU has multiple rails, then it could be half that (12.5A) per 8-pin connector.

 

Basically two 8-pin connectors are rated for half the new 12-pin connector so it is exactly matched. Any existing 8-pin connector from a PSU should be ok.

Main system: i9-7980XE, Asus X299 TUF mark 2, Noctua D15, Corsair Vengeance Pro 3200 3x 16GB 2R, RTX 3070, NZXT E850, GameMax Abyss, Samsung 980 Pro 2TB, Acer Predator XB241YU 24" 1440p 144Hz G-Sync + HP LP2475w 24" 1200p 60Hz wide gamut
Gaming laptop: Lenovo Legion 5, 5800H, RTX 3070, Kingston DDR4 3200C22 2x16GB 2Rx8, Kingston Fury Renegade 1TB + Crucial P1 1TB SSD, 165 Hz IPS 1080p G-Sync Compatible

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The current psu can support, 30a across 8 rails. So that said ive seen a rm850 I belive with IIRC was 50 odd amps on 12v. So that should be plenty. I have a o11-d case and plan to have custom loop so pumps and fans. Has 11 fans currently 

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