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3090 Worth it Over the 3080??

Also, I'm running my 3080 with a gold 750psu and it appears to be running well, pairing it with a 65w cpu.

So I don't think you can get away with those power requirements on a 3090
 
Squidward said:
Nvidia recommends a 750w for the 3090. I am running mine on a corsair SF750 with a 3900x and it is running great.
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I see, I did know that, so 750w should be ideal for the 3080. As I just checked and it says 750w for both 3080 and 3090, I thought the 3090 would get starved for power say your into overclocking etc.
 
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Sarge2255 said:
I see, I did know that, so 750w should be ideal for the 3080. As I just checked and it says 750w for both 3080 and 3090, I thought the 3090 would get starved for power say your into overclocking etc.
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A 750W will be fine for a 3080. The 3090 FE draws 350w stock, with the power slider maxed it caps at 400w. So an extra 50w in consistent peak load. Obviously their are the power spikes to account for too. It might be cutting it close on a 750w when overclocked.
 
Squidward said:
A 750W will be fine for a 3080. The 3090 FE draws 350w stock, with the power slider maxed it caps at 400w. So an extra 50w in consistent peak load. Obviously their are the power spikes to account for too. It might be cutting it close on a 750w when overclocked.
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I see, so those 1000w power supply recommendation YouTube videos are all overkill?
 
Zeeflyboy said:
The 3090 is barely cut down though, it’s 10496 vs 10752 shaders which is only just over 2% less... even if it scaled perfectly that’s basically nothing. As such I can’t see a 3090Ti unless process maturity is allowing higher clocks at lower voltages, but I could see a Titan which has both the full fat chip and the pro driver support.

3080Ti is interesting... the better option IMO would be to leave all memory busses enabled and go with 12Gb. The other option of keeping the narrower bus and going for 20Gb likely only really has the advantage of winning the PR war with AMD’s 16gb cards.

I have been convinced from the start that we’ll see a 3080Ti, only question to me is when. I personally put my bet on a 12gb 3080Ti falling somewhere not too far behind the 3090 in gaming perf, probably releasing by the summer but I wouldn’t be entirely surprised to see 20Gb just to win the spec war.

Of course actually buying one will be a whole other kettle of fish!
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They may do it on a smaller node as hinted recently when they said they are going to stay with Samsung so less power and potential higher clocks.

Refreshes with small unlocks between models has happened before and recently on Pascal with the 1080Ti > Titan XP > Titan Xp.
 
Squidward said:
A 750W will be fine for a 3080. The 3090 FE draws 350w stock, with the power slider maxed it caps at 400w. So an extra 50w in consistent peak load. Obviously their are the power spikes to account for too. It might be cutting it close on a 750w when overclocked.
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Some here (at least 2 members) had issues with 3090 on a 850w PSU as with Transient Peaks it hits 1000w, there issue went away once they fitted a 1000w PSU.
 
Depends on the card, a card with 2 8pin connectors will peak around 370-400w. Never seen mine jump over 370w with the slider maxed to 104%. I ran it for awhile on a EVGA GQ 750w and it ran fine, that was paired with a clocked 9600k @5.1. I upgraded to a 1000w later when i purchased my 9900k at the same all core clock speed which drank double what the 9600k did.

Watt meter tells me its pulling around 680-750w at the wall depending on what im doing.
 
Not sure, still fact his PC ran before fine and not after till PSU swapped and again more than one user.

Only one of them has dual GPU's
 
Sarge2255 said:
I see, so those 1000w power supply recommendation YouTube videos are all overkill?
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IMO yes, but the posts above state differently.
The RTX3090 was seen to spike above 500W by seasonic in testing. I think the new 12 Pin PCIE can draw up to 504W, and 75W from the PCIE slot which is a total of 579W for the GPU alone. If it spikes high enough to hit the PSU over power protection it will shut off.

In the case of my SF750W it is rated at 750W, with overcurrent protection set at 128.97% which is 967.3W.
In the scenario that my CPU and GPU are fully loaded at the same time and a transient spike occurs of 579W, adding my CPU load of 140w gives me a peak load of 719W which is well under the limit of the OPP at 967.3W


I am not a power supply expert but I think the above is correct.
 
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andybird123 said:
hence why I'm hedging my bets by trying to get hold of a 3080 now, then the ti when it does come out
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Err you said this:
andybird123 said:
Yeah but then you also said we'd be waiting till September for the 3080ti, but current rumours are April
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so either your info is old (same source as Dave) or you know something we dont know. If it is released this year it will be after the summer.
 
Sarge2255 said:
Also, I'm running my 3080 with a gold 750psu and it appears to be running well, pairing it with a 65w cpu.

So I don't think you can get away with those power requirements on a 3090
Click to expand...

Squidward said:
Nvidia recommends a 750w for the 3090. I am running mine on a corsair SF750 with a 3900x and it is running great.
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Correct Squidward. On the nvidia site it lists both 3090 and 3080 as 750w system power required.

My opinion on this though is 850w is about the right spot to give you some clocking headroom and the spikes some people have noticed. I am trying to source a 1000w unit in case I want to add another card in somewhere down the line, I like to always have too much rather than close to the wire.
 
JohnG7 said:
Some here (at least 2 members) had issues with 3090 on a 850w PSU as with Transient Peaks it hits 1000w, there issue went away once they fitted a 1000w PSU.
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Did they have Seasonic Focus, or focus based PSU's? Just come accross a full article explaining that these PSU's specifically cannot handle the transient spikes of the RTX3080 or RTX3090

Edit: Here is a quote regarding seasonic PSU's specifcally

For units, manufactured prior to January of 2018, the OCP is set too low. This leads to select GPUs, such as 2080 Tis, Vegas, 970s, and 1080 Tis shutting down randomly, due to triggering OCP and OPP, or because of high ripple at load.

SeaSonic produced a "fix", which is active on all units made after January of 2018. This really didn't fix it, however.

With the OCP being lifted higher, the units would produce absurd amounts of ripple at load. This can lead to instability and long-term component failure. Then, SeaSonic produced ANOTHER "fix", which was just a cable, with a capacitor and extra shielding, that reduced ripple. However, you would have to contact them to get one, and SeaSonic didn't include them in units.
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Squidward said:
What CPU's were they running?
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I was experiencing random shutdowns with a Corsair ax860 and rtx 3090. Cleared up by swapping in a 1000w psu.
However, it seems it was due to transient spikes more so than continuous power output. I'm thinking this as the Ax860 is fine in a pc that draws more continuous power (373w 2080ti + 9900k @5.2). The new system is drawing less power than the 9900k one, as I have turned off a ccd and undervolted+underclocked the cpu (waiting on a waterblock so very small cooler on cpu).

I'd say 850w should be enough, but some psu may struggle with the power spikes.
 
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