Buildzoid Discusses First Experience with Radeon RX 480 on LN2

Buildzoid recently posted a log of his first experiences overclocking a Radeon RX 480 with LN2. The talented Czech has become a pivotal figure as a captain of the /r/overclocking team (who just finished third in the Novice Nimble) and has posted plenty of videos showing off his modding skills. His current muse is the Radeon RX 480, a card which he volt modded in one of most recent videos. His session with LN2 has resulted in a thread on HWBOT where he shares his findings:

“My reference card didn't have either CB or CBB so I ended up running full pot. However I do suspect that my mounting might have failed at some point in time because I was clocking a little low and because I couldn't use the backplate for my Raptor 4 due to it conflicting with my extra cap placements.”

“If you can get into BIOS but not into windows then you need to go into safe mode and reinstall the drivers because Wattman remembers your last unstable OC and is trying to boot with it(praise AMD! /s). If you have an SSD and a clean setup this should not take too long.”

Check out the forum post here, and get involved in the discussion if you have experience of pushing an RX 480 on LN2.


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Czech Republic buildzoid says:

Ok so I just did my very first LN2 session with the RX 480. So I figured I'd share my expirience for anyone else intrested as well as start a generally discussion about pushing the RX 480 on cold.

Stuff to be aware of
My reference card didn't have either CB or CBB so I ended up running full pot. However I do suspect that my mounting might have failed at some point in time because I was clocking a little low and because I couldn't use the backplate for my Raptor 4 due to it conflicting with my extra cap placements.

If you can get into BIOS but not into windows then you need to go into safe mode and reinstall the drivers because Wattman remembers your last unstable OC and is trying to boot with it(praise AMD! /s). If you have an SSD and a clean setup this should not take too long.

- Stuff to use to overclock.
As of right now Elmor's LN2 BIOS + GPU Tweak II is the best for voltage control and clocks since it goes to 4Ghz core and 18Ghz mem as well as 2V on the core(not that you will ever reach any of those). At 150% power limit the BIOS gives you a 450W power limit.

- Display going black when running benches.
The card has black screen issues. If you push it really low(like say the -178C that I ran at according to my dodgy equipment) with high core voltage you will lose the display. The benchmark is still running you just can't see it. In theory this should be solvable by putting more volts on the .95V rail but I can't figure out how to Vmod it yet. Once I do I will test. To see if the card is running you when blackscreened you need to use a DMM on either Vcore or Vmem as either will show the impact of 3D load. For me mem would hit 1.571V under load and idled at 1.551V.

Overclocking
- Core overclocking
I could run windowed 3DM firestrike 1280x1050(IIRC not sure about the resolution) at 1600mhz however my best pass of Firestrike proper was only 1550mhz. Neither more Vcore(tested 1.4-1.6V) nor cold did anything. I suspect I may have just had a bad mount or something which caused these problems. Once I bench again I will know for sure. It is also possible my card just doesn't scale at all.

- Memory overclocking
The Samsung memory on my 8GB reference card seems to absolutely hate cold and voltage. I modded my card for 1.72V mem. That didn't help OCing at all. I also tried more VCCI(the voltage in the memory section of Wattman) that also didn't help either and led to the second driver reinstall I did in my session with the card.
The card could pass benches at 9Ghz mem on ambient. With the PCB freezeing through I was fighting for 8.5Ghz so I guess the RAM didn't like the cold either. The 4GB Hynix cards are probably a better choice for pure clock speed on cold IDK about performance someone would need to do a test.

BTW here's the memory voltage mod for reference PCB cards(it should be compatible with all card using the GS7256 controller):

FlanK3r says:

Man, going to czech forum also. You will be welcome in pctuning forum. I believe, your czehc will be better than my english :)

Czech Republic buildzoid says:

flanker said: Man, going to czech forum also. You will be welcome in pctuning forum. I believe, your czehc will be better than my english :)


My spoken Czech might be. But my written Czech is terrible.

FlanK3r says:

buildzoid said: My spoken Czech might be. But my written Czech is terrible.


Im sure better than my english :D

Czech Republic buildzoid says:

Ok so I just noticed something weird. If I try to set over 9Ghz mem in GPU Tweak II with extended OC range it just goes back to 9Ghz. Is there any chance of a fix for this? I was hoping that with more Vmem I could push as much as 10GHz but if the software doesn't allow above 9Ghz I can't really do anything.

Sweden elmor says:

buildzoid said: Ok so I just noticed something weird. If I try to set over 9Ghz mem in GPU Tweak II with extended OC range it just goes back to 9Ghz. Is there any chance of a fix for this? I was hoping that with more Vmem I could push as much as 10GHz but if the software doesn't allow above 9Ghz I can't really do anything.


It's limited by AMD in the driver.

FlanK3r says:

Maybe The Stilt could help with it.

Czech Republic buildzoid says:

elmor said: It's limited by AMD in the driver.


Yeah I figured as much

says:

I've had issues with certain overclocking programs creating visual artifacts once loaded, even if everything is left at stock, I think it's a conflict with AMD's own drivers sometimes. Have you tried overclocking through CCC?

Also, what driver are you using?

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