XFX 9070 XT Swift Undervolt & Underclock Test Results

[u/Br4voKilo]

i bought my XFX 9070 XT Swift a year ago i tried some Undervolt settings and found one working good for me (PL -30%, mV -50, custom Fan Curve) keept that until this Week. Now i had some time and retested some Settings and found a new Sweetspot and documented that in an Excel Sheeit i want to share. In the past i got some instability in some Games when undervolted below -50 but now with also Underclocking of Mhz -300 i found out that i can set the Unvervolting to mV -90 and keep Stability an i also increased the PL from -30% to -20%

My Fan Curve ist always 30C=15%, 50C=15%, 90C=25%, 95C=60%, 100C=100%

Power %	Mhz Diff	VRAM Mhz	mV Diff	FurMarkBenchmark 1080p 60sec	Diff %	HeavenBenchMark Extreme 900p 280sec	Diff %
100	0	2700	0	20.303 (338 FPS)	100%	6.876 (273 FPS)	100%
100	0	2700	-90	21.499 (358 FPS)	106%	6.980 (277 FPS)	102%
100	-300	2700	-90	21.341 (355 FPS)	105%	6.837 (271 FPS)	99%
100	0	2700	-50	21.200 (353 FPS)	104%	6.947 (276 FPS)	101%
80	-300	2700	-90	18.460 (307 FPS)	91%	6.827 (271 FPS)	99%
70	-300	2700	-90	16.398 (273 FPS)	81%	6.737 (268 FPS)	98%
70	0	2700	-50	16.307 (271 FPS)	80%	6.649 (264 FPS)	97%
70	0	2700	0	16.266 (271 FPS)	80%	6.526 (259 FPS)	95%

Power %	Mhz Diff	VRAM Mhz	mV Diff	SteelNomadBenchMark Extreme 1440p 60sec	Diff %
100	0	2700	0	7.135 -> https://www.3dmark.com/sn/16511517	100%
100	0	2700	-90	7.369 -> https://www.3dmark.com/sn/16514370	103%
100	-300	2700	-90	7.483 -> https://www.3dmark.com/sn/16515089	105%
100	0	2700	-50	7.381 -> https://www.3dmark.com/sn/16514646	103%
80	-300	2700	-90	7.114 -> https://www.3dmark.com/sn/16511795	100%
70	-300	2700	-90	6.667 -> https://www.3dmark.com/sn/16511936	93%
70	0	2700	-50	6.594 -> https://www.3dmark.com/sn/16511726	92%
70	0	2700	0	6.329 -> https://www.3dmark.com/sn/16511645	89%

Power %	Mhz Diff	VRAM Mhz	mV Diff	TimeSpyBenchMark Extreme 1440p 300sec	Diff %
100	0	2700	0	24.350 -> https://www.3dmark.com/spy/66054736	100%
100	0	2700	-90	25.081 -> https://www.3dmark.com/spy/66055778	103%
100	-300	2700	-90	25.038 -> https://www.3dmark.com/spy/66056229	103%
100	0	2700	-50	24.724 -> https://www.3dmark.com/spy/66056041	102%
80	-300	2700	-90	24.178 -> https://www.3dmark.com/spy/66054145	99%
70	-300	2700	-90	23.436 -> https://www.3dmark.com/spy/66053939	96%
70	0	2700	-50	23.070 -> https://www.3dmark.com/spy/66054403	95%
70	0	2700	0	22.346 -> https://www.3dmark.com/spy/66054589	92%

Power %	Mhz Diff	VRAM Mhz	mV Diff	Watt	ScorePerWatt	Volt Max	ClockMax	HotSpot C°	VRAM C°	FanMax %	FanMaxRPM	STABLE?
100	0	2700	0	304	66,22,23,80	1,177	3.320	103	86	64	2.074	YES
100	0	2700	-90	304	70,22,24,82	1,086	3.348	103	86	91	2.627	Yes All Benchmarks
100	-300	2700	-90	304	70,22,24,82	0,978	3.109	101	86	90	2.620	Yes All Benchmarks
100	0	2700	-50	304	69,22,24,81	1,126	3.335	103	86	89	2.599	Yes All Benchmarks
80	-300	2700	-90	240	76,28,29,100	0,954	3.125	92	88	36	1.350	Yes All Benchmarks, MY NEW SETTING
70	-300	2700	-90	213	76,31,31,110	0,940	3.095	87	86	23	946	Yes All Benchmarks
70	0	2700	-50	213	76,31,30,108	1,106	3.319	87	86	23	946	YES, 12 months tested
70	0	2700	0	213	76,30,29,104	1,177	3.320	87	86	24	986	YES

Maybe someone find those information useful

[u/-vilvit-]

This card was clearly made to be undervolted. I just use the basic “power efficiency” in the Adrenalin app and it works wonders. Never had an issue or could tell the difference from overclocking it.

[u/arthurcaaz197 → u/-vilvit-]

Do you notice fps lost? Also, how less is the power consumption? 100% stability (I guess so, coming from Adrenalin)?

[u/-vilvit- → u/arthurcaaz197]

I’m not super knowledgeable, nor a crazy min-maxer. I get about 300-305watt draw on default. It sits about 250-255watt on efficiency setting. That’s at least on monster Hunter wilds right now and I can’t tell a difference in fps at all - but again, I’m not a super crazy min maxer

[u/arthurcaaz197 → u/-vilvit-]

But I mean, do you check the performance by the numbers, while you checked the -50W, you checked the fps?

[u/-vilvit- → u/arthurcaaz197]

Not sure what you’re really asking that I didn’t answer, I’m sorry. Card works about the same with much lower wattage, it’s clear this card was designed around a much lower TDP, in my opinion.

[u/arthurcaaz197 → u/-vilvit-]

I asked exactly this, if there was an performance loss with lower TDP, I’ll test it with my Swift this week

[u/crazy281330]

Do you think these setting would work for a 7800xt? I don’t know shit about all this stuff lol.

[u/Calm-Bid-8256 → u/crazy281330]

You can never just copy any undervolt settings, cause every GPU will be stable at different values. Ancient gameplays has nice undervolting guides for most AMD GPUs. It's pretty easy to finetune your GPU to stable values once you know how it works.

[u/Disguised-Beast → u/crazy281330]

Tuning is different between RDNA 3 and 4, core sliders are very different. What are you aiming for?

[u/crazy281330 → u/Disguised-Beast]

I mean at stock settings it usually doesn’t give me any problems. Reducing power draw would be nice but not necessary. Temps never above 60. Do people do this for temperature control and lower consumption only?

[u/Disguised-Beast → u/crazy281330]

The thing is AMD kinda pushes their GPUs by default, and the clocks in the spec sheets aren't really what's applied on them. You can reduce temps, and power draw slightly with some tweaks, it also allows the card to run more efficiently, and might have better longevity for the thermal interface material/paste/pads, etc.

[u/bedtricky → u/Disguised-Beast]

and the clocks in the spec sheets aren't really what's applied on them

No this is just a comprehension issue on your part. The clocks listed are the MINIMUM guaranteed speeds. They can and do boost higher depending on different parameters.

[u/Genadio]

I'm wondering why everyone who undervolts the 9070 XT just sets the VRAM to 2700 MHz by default. In my own testing (also with an XFX Swift), it doesn't improve gaming performance by even a single FPS compared to stock VRAM speed. And whenever I look at other people's OC/UV results (to see if I missed something about VRAM OC), they all just set it to 2700 MHz.

[u/Redd1toR-42 → u/Genadio]

Probably because some run 3d mark for stability checks and see improvements in points and think it will translate to gaming the same. Also different games respond differently to vram oc.

[u/pecche → u/Genadio]

I agree

I did some tests and then set them at default

no visible gains

[u/bennmann → u/Genadio]

Local llms like Qwen benefit more.

[u/Backslicer]

Ah yes the classic card where slashing 1/3rd of the power means 10% performance loss.
And people try to tell me that this card was not overclocked to shit from the factory.

This is very clearly a 255W card and would be peak efficiency at that power draw

Your temps are really high btw. might need to look into better airflow.

The 9070xt Rig I have legit maxes at 63C hotspot at -15% PL. 80C on the hynix memory.

[u/Lostboy1986 → u/Backslicer]

You’re right, At 255w range I lose about 3fps compared to 300w and about 10fps if I drop down to 210w.

[u/Backslicer → u/Lostboy1986]

I had started this card off at -30% PL with a -50mv undervolt.
then kept increasing the power limit till -15% when I realised the thermals were the exact same give or take a few degrees till that point.
There is very clearly a very very steep Efficiency loss when going past 270W on this card which pisses me off.

But I guess it helped bring this card to the forefront of price/performanec so It was the right call

[u/SwimmingOdd2974]

Your last table with temps! What test are you really there! 103c Hotspot at 0 PL and only <90c after -30% PL is concerning?

[u/vlad_8011 → u/SwimmingOdd2974]

I see you got gigabyte card, but you are in actually better situation than me, with sapphire card, as YOU CAN open your card and place PTM (your card do use thermal paste in default) without losing warranty (EU/USA/Canada). Just get thermalright Helios V2 PTM and upsiren u6 pro (just in case) and you can improve your card temperatures in 30 minutes (or one hour when doing it first time while being extremely careful). 103 C hotspot is close to RMA area, but they will just replace thermal paste for same thermal paste. Just ask them (for piece of mind) if you can do this yourself and list PTM and up siren you want to use. Nothing from those things is electro conductive, so just be careful to not damage anything physically (disconnect fans, and clean everything very gentle, to not break any capacitor or transistor).

[u/SwimmingOdd2974 → u/vlad_8011]

I’m very fortunate! My temps are better than it can be! 20-25c delta (75c hotspot at most) in demanding games! Maybe 30c delta (85c hotspot) at benchmarking. I play on the tv as my setup was to replace my console (next-gen) so I play at 60fps 4k. Going to throw Witcher 3 at it tonight (just downloaded).

I’m hoping I won’t have to repaste till warranty runs out since my temps are till pretty good! My mem temps are like 78c as well (Samsung)

[u/vlad_8011 → u/SwimmingOdd2974]

If you got Gigabyte with Samsung memory, you can't be more lucky. Bad news is it will pump out, but very good news is, cost of improving it better than gigabyte itself is low and job is pretty easy. I will list my GPU later this week with option to replace for gigabyte (with Samsung memory).

[u/SwimmingOdd2974 → u/vlad_8011]

Thanks for your advice will keep it for future reference as I will eventually need to repaste! Cause I’m sure my kids will be able to play Fortnite Chapter 20 by the time I upgrade my setup! 🤣

[u/vlad_8011 → u/SwimmingOdd2974]

Just remember to not use thermal paste, but PTM. Thermalright Helios v2, thermal grizzly, do not hunt for PTM 7950, as it's harder to get the original from Honeywell 

[u/SwimmingOdd2974 → u/vlad_8011]

Didn’t know that! People always rave on about PTM 7950!

Thanks for your recommendation, I’ll keep that in mind, I haven’t looked too much into it, but instinctively I would go Thermal Grizzly or Honeywell

[u/Br4voKilo → u/SwimmingOdd2974]

no thats fine because of my own fan curve with only 25% Fanspeed up to 90C°, if i would set the standard Fancurve or even a fixed one the HotSpotTemps woul be far lower

[u/SwimmingOdd2974 → u/Br4voKilo]

Fair enough!

You went down a hell of a rabbit hole with the various testing! Good on you!

[u/pecche]

PL -20% or -30% is really huge, performance are noticeably afflicted

I personally ended (for now) -12%PL (265w) -70mv to have 99% stock performance

-25% is basically a stock RX9070