Gigabyte 3080ti Gaming OC

[Kenrou]

Friend just got me one of these (he upgraded to a 4080s), and I was "forced" to upgrade my PSU along with it because it was tripping my Seasonic 650w, seems to be fine with this 850w. I was genuinely surprised with this variant, how cool/quiet it is, and that it only allowed for 350w (~360w peak). This thing is a beast, but because it's constantly hitting the voltage wall, the clock fluctuates wildly, giving it a fairly poor stock result. Is this a normal thing with 3080ti?

https://www.gigabyte.com/Graphics-Card/GV-N308TGAMING-OC-12GD#kf - LHR, Hynix memory

Stock settings (friend's system) 70c core/80c hotspot/85c memory


Absolute minimum settings for stability that i could find, 1710mhz 0.750v (had to laugh at the score)


My undervolt, 1860mhz core, 2700mhz/10800mhz memory, 0.825v, 1080p/1440p, 4k lowers to 1845mhz, stays stable well below the wall, always below 65c core/75c hotspot/80c memory

 

[Woomack]

These cards all have the same max voltage, and depending on the power limits, they all show power limit or voltage as a reason for the max frequency limit. Run GPUZ as it shows the reason on the sensors list.
I'm surprised that manual undervolting works as it doesn't work for most cards and they only automatically adjust the voltage (even if you can move the slider). Typically, if you want to reduce the heat, lowering the power limit is best. I run RTX4070/Super at 75-80% power limit because I barely see the difference in games that I play, while I can set fans at static 30%.

 

[Kenrou]

Not sure what to tell you, manual undervolting has done much better in every GPU I've had over the years compared to lowering the power limit, for example, this one (in Heaven/3DMark) even at 80% does ~1755mhz 0.870v ~300w ~65c, 70% ~1600mhz 0.815v ~260w, my undervolt gives better results

 

[Woomack]

On older cards, it wasn't the same as now. I just said you can try, but if your way works well then it's good too. I also said that voltage adjustments usually don't work on newer Nvidia cards because manufacturers are forced to use Nvidia specs. It works on some models, but not on all, and if not, then the only way is to play with power limits.

There is also one more thing about power limits and keeping optimal performance/FPS. Some cards work better when you lower power limits with memory clocks (typically higher GPUs). Some work better when with lower power limits you raise memory clocks (typically lower GPUs). The reason is that the card assigns more resources to the GPU for cards with high memory bandwidth and more resources to memory when it lacks bandwidth. The whole point is to lose less FPS lowering the power limit more.
In the end, you have to check what works best on your card ... but if you tested it already and feel it works well then no problem

 

[Kenrou]

Aight, I'll run some benchmarks just lowering power limit with/without memory OC, will post them here in a few.

 

[Kenrou]

Tried lowering memory clocks like you said, went all the way down to -500mhz, they actually added ~200 points to all these, but still underperforming compared to my manual undervolt

90% ~1755mhz ~65c ~340w


80% ~1650mhz ~63c ~300w


70% ~1515mhz ~60c ~260w

 

[Woomack]

I was able to drop RTX4080 power by ~70W losing ~10% performance. I wasn't checking details on RTX4070/Super, but I generally look at the general experience, not numbers. I could drop the wattage by about 70W without noticing any significant difference in some games. The lowest FPS wasn't much different, the max was significantly lower, but I don't need 200FPS+ daily and I don't always run at max details. I also play at 1440p.
Maybe you already found the best settings and it won't be much better.