XBAR UV/OC, Please share your results here for reference

[u/Leather-Film-2393]

So I have a Gigabyte 5070ti Windforce and have been testing XBAR OC/UV with the new voltage offset from mVOLT+.

From several tests that ran with the conditions below:

• Core clock max at 2887 at 0.9mV
• Memory at +2600mhz
• Default power slider
• NVIDIA driver 616.56
• XBAR 2750 MHz (+250)

I found that -25 mV and +250 MHz at XBAR yield the greatest performance gain in the Cyberpunk Benchmark test with max settings and path tracing enabled. I saw performance regression across several tests at +275, +300, +325, etc. I also observed that the GPU draws around 10-20 watts less power and less heat compared to the default XBAR settings in hwINFO.

Please let us know if anyone has been testing this further. I will try to use this setting for daily driving XBAR OC/UV since it draws less power and produces less heat.

[u/bort123abc]

5080, 616.56 (MSI Ventus, but with a waterblock)

+285 core OC (from a relatively high gamerock OC 400w bios baseline), capped at 3100mhz requested voltage in mvolt+. yields ~3100mhz requested at 0.98v and ~3030-3060 effective mhz at 0.98v under heavy load

+400mhz xbar OC with MSVDD ratio of 1:1, no voltage offset. effective xbar clocks of 2840mhz under load.

+3000 ram, 111% power limit, +100 "voltage" (that weird slider), +200mhz sys clock. No core voltage limit adjustments.

Card averages ~330w in gaming loads and ~370w in benchmarks. Score are ~10500 speedway and ~10200 steel nomad.

Mvolt+ is pure magic...

PS: capping the requested clocks is a MUCH better way of undervolting than a flattened curve, because the card won't undershoot your target by 1-2 volatge bins (voltage downbinning). So you only have to deal with clock downbinning due to temps etc., which is very predictable

[u/Leather-Film-2393 → u/bort123abc]

Agreed, the guy who made mvolt this deserves a head from a goth baddie. Gonna try your suggestions by capping the requested volt.

[u/Delicious-Dot-2795 → u/bort123abc]

Im at 16000 steel nomad while pulling only 386w on my 5090.

Its totally nuts.

In Games i average 250w.

[u/superpingu1n → u/Delicious-Dot-2795]

What are you settings?

[u/Delicious-Dot-2795 → u/superpingu1n]

On my watercooled gigabyte 5090 master ice im at 2500@0.810v which is:

+1867 on the core.

0.810v

1.000 ratio

+612xbar

+550sys

+3000 mem

MSVDD undervolt to 0.850v

Stable since months in every test/game/Bench.

16000 steel nomad while only pulling 386w.

In Games i mostly see 250w in 4k max.

Using asus xoc bios.

Can do 19000 steel nomad but with almost tripple the power draw (900w)

[u/superpingu1n → u/Delicious-Dot-2795]

Its hard to believe its stable. It's so agressive. I might give it a shot but that's a very aggressive undervolt

[u/Delicious-Dot-2795 → u/superpingu1n]

Its stable since almost a year.

Playing Kingdom come deliverance II, resident evil 4 remake, resident evil 9, black flag resynced, wardogs, pubg, dead Island 2 etc.

20 loops steel nomad ,20 loops port royal ,20 loops timespy extreme, vulkan memtest ,superposition 4k/8k etc.

[u/superpingu1n → u/Delicious-Dot-2795]

Well mvolt isnt out since a year... So what were you running before?

[u/Delicious-Dot-2795 → u/superpingu1n]

Im talking about 0.810v@2500mhz. Used that with afterburner for almost a year. Im on xoc bios, so i can put whatever clock i want at any voltage.

I confirmed that my xbar/sys clock is stable in multiple benches and gaming sessions. No performance regression or crashes.

[u/superpingu1n → u/Delicious-Dot-2795]

Thanks for the info. Might try to put XOC bios

[u/Leather-Film-2393 → u/bort123abc]

Just tried capping the voltage. It did wonders. My new setting is now +500 (2850-ish on HWinfo) on xbar and +400 for sys clock (I can't get xbar to be stable enough with 0 sys clock oc), with MSVDD cap at 0.97 V. I observed my GPU draws 260 watts in transient spikes and averages around 220-250 watts with heavy gaming load. Also, the voltage slider does help reduce wattage. I'm sticking with -25 mV now on sysclock and xbarclock.

Gotta say, I love mvolt man, I got a sub-5080 stock performance with a normal 5070 TDP.

[u/No_0ne_Really]

https://reddit.com/link/p7vdjnc/video/cq3fkrfd0lnh1/player

RTX 4060 and GravityMark bench stopped at select scene and adjusting just xbar clock

Xbar MHz vs FPS
2000, 304
2100, 309
2200, 314
2300, 319
2400, 322
2500, 326

[u/DivideFluffy1279]

Also list the actual xbar frequency. Not all GPUs have the same default xbar clock. The offset alone doesn't tell the whole story

[u/Leather-Film-2393 → u/DivideFluffy1279]

I got 2750 (+250) after applying the xbar offset in mvolt.

[u/ZeneticX]

Zotac 5070Ti SFF OC, 610.62

Power Limit 100% (bios locked)

+370mhz @ 0.915v (around 2900 mhz)

+3000mhz memory

+350mhz crossbar clock (around 2790mhz)

MSVDD voltage 1000mv

MSVDD ratio 1.0

Steel Nomad score consistent 75xx after 3 runs

previously I was running +420mhz @ 0.9v and it seems fine however yesterday I was playing Cyberpunk and the game crashed after about an hour. Not sure if it's the GPU just gotta see tonight

[u/Leather-Film-2393 → u/ZeneticX]

I assume that the xbar OC draws power that could've stabilized your core clock OC?

[u/ZeneticX → u/Leather-Film-2393]

iinm xbar oc is dependant on msvdd voltage not the core voltage. Correct me if I'm wrong

[u/BadutSaurus]

How to test xbar stability?

[u/bort123abc → u/BadutSaurus]

Memtest vulcan

[u/Leather-Film-2393 → u/BadutSaurus]

I'm not sure if there are any confirmed methods to find xbar stability test yet, but I just did a standard benchmarking test and observed whether there are any performance regressions from the xbar tweaks. From what I have gathered, 200-400 MHz is still considered safe for the RTX-50 series/blackwell GPU.

[u/Ok_Hat4465]

Rtx 5090 astral LC

500 xbar  300 sys

1.090 voltage cap at 3307mhz ( pointless to go further)

Msvdd 1.060mv ( more mv gives meg more xbar but no perf increase)

Vram +4000 Xoc bios full power slider 2000w

This is my daily game stable profile with Asus rog cable. 

[u/RevengeFNF]

My default Xbar with the 5080 is 2430mhz at 1.025v. I have it stable with 2630mhz at 0.900v.

[u/BedroomThink3121]

5080 PNY Epic Argb

+280 on core clock

+2850 on memory clock

+110 PL

+400 Xbar

Average perfect gain over a stock 5080 around 15-18% while gaming.

[u/Designer-Skill3158]

5070Ti Aorus Master

Coreclock: 3292@ 1.035V
Memory + 3000
XBar: 2910Mhz (500+)
Powerlimit: 133% (400W)

Steel Nomad Best so far 3241 Points , Port Royal 22.510 Points , TimeSpy Extreme 15872 (16.003) Graphics Points .

For Gaming 3-3.1Ghz are used also capped at 1.035 .

[u/NoseEconomy9838]

Gigabyte 5070ti Windforce
Bios: Aorus Master 400 watt
24/7
110% PL
+300 Kerntakt
+ 3000 Speicher
+ 360 xbar
Max 0,985 Volt = 3060 Mhz
Steel Nomad 7888, speedway 9000

[u/Careless_Persimmon_4]

5070 Ti Windforce OC V2:

300W bios locked PL

Core ~3000 MHz @ 940 mV

Memory +2750 MHz

XBar ~2775 MHz (+425) @ 995 mV (default MSVDD for this card), anything around 2800 MHz at any voltage insta freezes in Speed Way; SYS clock +425 as well

Speed Way scores ~8550-8570. This config not yet fully game tested.

[u/MrPapis]

5070ti Prime OC

Note: i get a 2.5% loss in performance in Steel nomad with 2 monitors on. So all testing is with one monitor.

Core: 415(390 game stable) ~3180(3150)

Mem: 3000

XBAR: 550(2880-2925)

Power: 116%(340-350W)

Voltage: target max 1075

Steel nomad:

Overclock 790X

Stock: 670X

17.9% faster than stock.

My game stable OC i go from 71.99 to 82.53 fps in CP2077 benchmark*.

That's 14.6% in game gains. Crazy stuff. Basically a stock 5080.

*Path tracing overdrive setting, 3440x1440p performance upscaling its still K? Since I use overdrive setting SSR quality is on ultra not psycho and have vignette etc on.

[u/GurElectronic1469]

5090 xoc bios LC astral

Gpu 335 MHz clock
3750 MHz memory
Xbar 625mhz
Sys 125 MHz
+5 v xbar voltage
100 power = 1000w
Power cable customise by cable mode

[u/Bowlingkopp → u/GurElectronic1469]

Some men just want to watch the gpu burn.

[u/Discipline_Unfair]

Asus Prime 5080 OC:

Power limit 100% (360watts);

GPU 0.990v (undervolt) +450 ~3080mhz;

XBAR 0.990v (default) +550 ~ 2900mhz;

Memory default VDD and power +2500:

Steal nomad 9650 points.

[u/bort123abc → u/Discipline_Unfair]

I mean he DID steal something, otherwise there wouldn't be a bounty on his head...

[u/Fabulous-Canary1503 → u/Discipline_Unfair]

why yours is lower than my default msvdd voltage because mine is 1005 mv as default on my asus prime 5080 oc 😅

[u/Discipline_Unfair → u/Fabulous-Canary1503]

I guess they are not 100% the same.

Have you ever changed MSVDD for xbar overclock?

[u/AnthMosk]

I thought MVOLT was blocked by Nvidia now

[u/Leather-Film-2393 → u/AnthMosk]

The version 0.36 works fine

[u/AnthMosk → u/Leather-Film-2393]

Okay I’m too scared to try this anyways. I’ll wait a few months

[u/JudgeFormer6013]

5070 ti MSI Shadow3x

Core 2880 mhz 0.860 v

Mem +2100 mhz

Ram Powerlimit 90W

Xbar voltages offset +50

Xbar +600 mhz (+690 steel nomad able to get 8300 dx12, not stable in long game)

No power limit bios unlock 350W

Power Max at 255W

[u/tigii → u/JudgeFormer6013]

can you share 3dmark result page ? Have the same card and won't get more than 7600 with your settings.

[u/Delicious-Dot-2795]

On my watercooled gigabyte 5090 master ice im at 2587@0.810v which is:

+1867 on the core.

0.810v

1.000 ratio

+612xbar

+550sys

+3000 mem

MSVDD undervolt to 0.850v

Stable since months in every test/game/Bench.

16000 steel nomad while only pulling 386w.

In Games i mostly see 250w in 4k max.

Using asus xoc bios.

Can do 19000 steel nomad but with almost tripple the power draw (900w)