st33med
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Wednesday, February 10, 2021 11:23 PM
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I've been having a problem with my 3080 XC3 in which I can't make it pull more than 300ish watts; I've only seen it top out at 310 according to GPU-Z. GPU-Z also indicates I have hit a 'power limit' even though it should be hitting 340+ W. Scores under Port Royal just hit the average around 11500 with a +125 MHz core overclock and 108% power limit, with clocks hitting around 1950-1980 MHz. I made sure to try two separate PSU cables as well instead of the daisy-chain single cable setup. I also have it water cooled and it only hits 45 C. My only other complaint is significant coil whine. CPU: Ryzen 5950X GPU: EVGA RTX 3080 XC3 Ultra (under an EK waterblock) Motherboard: Gigabyte X570 Aorus Master RAM: Ballistix 3600 MHz DDR4 PSU: EVGA 750 GQ Attached is an capture of GPU-Z during a Port Royal stress test.
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st33med
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Wednesday, February 10, 2021 11:47 PM
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Just tried regular Time Spy and its reaching 14600 when the average is 17k...
I'm now wondering if there's something else wrong with the card.
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Dabadger84
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Wednesday, February 10, 2021 11:54 PM
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The attachment isn't loading, I would guess because you don't have 10 posts yet.
Have you tried different tests & games to see where it hits power limit there? Something like Time Spy or Time Spy Extreme should show higher power draw. In my experience, Port Royal almost never actually hits the real power limit on a given card - I never saw 450W from PR on my 3080 FTW3 Ultra, never saw the "500W" on the broken arse XOC Beta BIOS for the 3090 FTW3 Hybrid, and I rarely see 520W on the LN2 "520W" BIOS for the 3090 Kingpin on PR either - I have to push my clocks quite a bit to even get peaks in to the 520W range, without touching voltages in Classified Tool.
Basically what I'm saying is, Port Royal isn't the best example to use for whether or not your card is performing properly in regards to power limiting. I'm betting Time Spy Extreme you will see clock/voltage throttles in Graphics Test 2 (cuz most people do) with a hard/almost solid PWR PerfCap reason, and draws all the way up to the actual power limit of your card.
Edit: The other problem is a 750W unit is a bit light for something as power hungry as the 5950x, especially if you're pushing any kind of OC, that by itself can get up to 300+W draw, real quick.
ModRigs: https://www.modsrigs.com/detail.aspx?BuildID=42891 Specs:5950x @ 4.7GHz 1.3V - Asus Crosshair VIII Hero - eVGA 1200W P2 - 4x8GB G.Skill Trident Z Royal Silver @ 3800 CL14Gigabyte RTX 4090 Gaming OC w/ Core: 2850MHz @ 1000mV, Mem: +1500MHz - Samsung Odyssey G9 49" Super-Ultrawide 240Hz Monitor
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st33med
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 0:11 PM
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Dabadger84
The attachment isn't loading, I would guess because you don't have 10 posts yet.
Have you tried different tests & games to see where it hits power limit there? Something like Time Spy or Time Spy Extreme should show higher power draw. In my experience, Port Royal almost never actually hits the real power limit on a given card - I never saw 450W from PR on my 3080 FTW3 Ultra, never saw the "500W" on the broken arse XOC Beta BIOS for the 3090 FTW3 Hybrid, and I rarely see 520W on the LN2 "520W" BIOS for the 3090 Kingpin on PR either - I have to push my clocks quite a bit to even get peaks in to the 520W range, without touching voltages in Classified Tool.
Basically what I'm saying is, Port Royal isn't the best example to use for whether or not your card is performing properly in regards to power limiting. I'm betting Time Spy Extreme you will see clock/voltage throttles in Graphics Test 2 (cuz most people do) with a hard/almost solid PWR PerfCap reason, and draws all the way up to the actual power limit of your card.
Edit: The other problem is a 750W unit is a bit light for something as power hungry as the 5950x, especially if you're pushing any kind of OC, that by itself can get up to 300+W draw, real quick.
Sorry about the pic. Here's a link to it, hopefully this shows up.  Time Spy gave that bad result above of 14K, but then Time Spy Extreme gave a 9134 which is above average. Both only hit 300-310-ish watts and say they are power limited in GPU-Z. This confuses me greatly. And I'm aware about the PSU, but for the moment, I'm not drawing much over 500 W in these tests. I may eventually get a 1000W PSU for better efficiency.
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st33med
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 0:17 PM
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Update: re-ran Time Spy and it gave a 17k result which meets the average, but still hitting that ceiling of 300-310W. I think it should be well above average for an overclock, shouldn't it?
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Dabadger84
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 2:20 AM
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st33med
Update: re-ran Time Spy and it gave a 17k result which meets the average, but still hitting that ceiling of 300-310W. I think it should be well above average for an overclock, shouldn't it?
Not necessarily as the "Average" is likely going to be the "average" overclock seen on your GPU - very few people run results at stock more than once. For a reference here's my severely dated but still somewhat relevant run from back in the dae (like 3 months ago): https://www.3dmark.com/spy/14651349 Time Spy, 18194 @ +130 core, +800 vRAM and that's on a FTW3 Ultra so higher stock clocks than yours https://www.3dmark.com/spy/14796533 Time Spy Extreme, 8928 @ +135 core, +800 vRAM Note those are also both with my system RAM @ 4000MHz CL17 with a tRFC of 400, which is fairly tight for that speed.
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bmgjet
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 3:03 AM
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Theres nothing you can do, Its hardware limitation of the 3080 XC3.
Has analog VRM driver so the balance set at the factory is what it will always have.
Then it will hit one of the inputs power limits before hitting the total board power limit, either slot, or 1 of the 8pin plugs.
It cant rebalance the power to pull more from the other inputs so thats as far as it goes.
The cards that used digital VRM controller they just reshuffle the balance to pull more from a input thats not hit that limit.
Yours is hitting plug 2 power limit, There no bios with higher 8pin inputs and using one with a higher slot power limit wont help since your not on the slot power limit.
So your only choices are replace the balancing resistor array around the up9511r, Or shunt mod it if you want more power from that card.
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st33med
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 6:06 PM
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bmgjet
Theres nothing you can do, Its hardware limitation of the 3080 XC3.
Has analog VRM driver so the balance set at the factory is what it will always have.
Then it will hit one of the inputs power limits before hitting the total board power limit, either slot, or 1 of the 8pin plugs.
It cant rebalance the power to pull more from the other inputs so thats as far as it goes.
The cards that used digital VRM controller they just reshuffle the balance to pull more from a input thats not hit that limit.
Yours is hitting plug 2 power limit, There no bios with higher 8pin inputs and using one with a higher slot power limit wont help since your not on the slot power limit.
So your only choices are replace the balancing resistor array around the up9511r, Or shunt mod it if you want more power from that card.
That seems like a VERY bad design to me if it can't balance two pins to use all the TDP needed. Especially for a $770 card. I'm pretty upset if that's true.
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arestavo
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 6:49 PM
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The power limit can also be triggered by the VRAM. Try underclocking the VRAM by 500Mhz or more and see if that clears the PWR perfcap.
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neteng101
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 7:03 PM
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bmgjet
So your only choices are replace the balancing resistor array around the up9511r, Or shunt mod it if you want more power from that card.
Can different cards end up with different levels of performance given variances from the factory then? I can pull close to 360W (359.x max) for total board power draw on my 3080 XC3 Ultra and my highest Timespy run is 18600+ GPU although its not a practical overclock. 100% fan speed, stock cooling, 108% power limit, +135? OC, +1000 memory. https://www.3dmark.com/spy/17924762
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bmgjet
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Thursday, February 11, 2021 11:11 PM
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neteng101
bmgjet
So your only choices are replace the balancing resistor array around the up9511r, Or shunt mod it if you want more power from that card.
Can different cards end up with different levels of performance given variances from the factory then? I can pull close to 360W (359.x max) for total board power draw on my 3080 XC3 Ultra and my highest Timespy run is 18600+ GPU although its not a practical overclock. 100% fan speed, stock cooling, 108% power limit, +135? OC, +1000 memory.
https://www.3dmark.com/spy/17924762
Yes, You can win the silicon lottery where certain parts of your GPU is more efficient so its not hammering just 1 of the inputs by a high leakage chip. Also the game setting and res will make a difference as well. Such as playing on 1080p no rt its going to be hitting different parts of the chip then trying 4K with rt on. Having the fan will also add to board power draw, The fan at 100% is going to be drawing about 23Ws on its own, OP could plug a fan back into his card and set it to 100% and then he would be hitting 320ish W instead of just 300W before he gets stuck.
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Sleepycat3
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Friday, February 12, 2021 1:10 AM
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I have a 3080 XC3 Ultra as well, but purposely undervolted to 875mV and aiming for 1950 MHz core. The upside of your card is that you are hitting the same 11500 Port Royal score as my card, but while consuming much less power (at least according to GPU-Z). My peak card power draw was 328.9W in Port Royal as below. Our GPU and Memory clocks are almost the same, so I wonder if GPU-Z is reporting incorrect values for both our cards. If you look at my PerfCap Reason, it stays at Idle throughout the entire Port Royal run.  The other thing I found was that Port Royal also draws less power than regular Time Spy. What's your power draw in Time Spy and Time Spy Extreme? Regular Time Spy was 346.8W. 
post edited by Sleepycat3 - Friday, February 12, 2021 1:26 AM
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Dabadger84
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Friday, February 12, 2021 1:20 AM
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Sleepycat3
I have a 3080 XC3 Ultra as well, but purposely undervolted to 875mV and aiming for 1950 MHz core. The upside of your card is that you are hitting the same 11500 Port Royal score as my card, but while consuming much less power (at least according to GPU-Z). My peak card power draw was 328.9W in Port Royal as below. Our GPU and Memory clocks are almost the same, so I wonder if GPU-Z is reporting incorrect values for both our cards. If you look at my PerfCap Reason, it stays at Idle throughout the entire Port Royal run.
It's really hard to hit "PWR" as a PerfCap reason if you're undervolting, especially if it's as low as 875mV. Keep in mind, stock voltage for these cards is in the 1062-1093mV - so you're using almost 20% less voltage than that. Kind of surprised your power draw is as high as it is with that much of an undervolt. But, if you look at your power draw, that 328W is only for a short spike, the rest of it is a pretty flat line that looks to be a fair bit less than that. Look at the bright side, your PerfCap thing isn't a rainbow like mine was during this run lol: 
ModRigs: https://www.modsrigs.com/detail.aspx?BuildID=42891 Specs:5950x @ 4.7GHz 1.3V - Asus Crosshair VIII Hero - eVGA 1200W P2 - 4x8GB G.Skill Trident Z Royal Silver @ 3800 CL14Gigabyte RTX 4090 Gaming OC w/ Core: 2850MHz @ 1000mV, Mem: +1500MHz - Samsung Odyssey G9 49" Super-Ultrawide 240Hz Monitor
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Sleepycat3
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Re: EVGA 3080 XC3 Ultra Drawing 300 W or Less
Friday, February 12, 2021 2:04 AM
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Dabadger84
It's really hard to hit "PWR" as a PerfCap reason if you're undervolting, especially if it's as low as 875mV. Keep in mind, stock voltage for these cards is in the 1062-1093mV - so you're using almost 20% less voltage than that. Kind of surprised your power draw is as high as it is with that much of an undervolt. But, if you look at your power draw, that 328W is only for a short spike, the rest of it is a pretty flat line that looks to be a fair bit less than that.
It is actually being reported by GPU-Z as that high, but I think it is a measurement error. Here is an in-bench screenshot. It was hovering above 320W in that section for quite a while, so was not a momentary spike. The board power draw that GPU-Z reports when I compare idle and running Port Royal (324W - 38W = 286W) doesn't match to my wall power consumption (540 - 230W = 310W). There is no way my 5900X would be drawing only 24W in Port Royal if the GPU-Z board power draw number was correct! 
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