Topic: R9 Nano Modded Rom - page 29. (Read 60873 times)

I remembered that you said for the Sapphire R9 390 cards, you can modify the memory voltage with MSI afterburner?

Stock memory voltage = 1.3v, i lowered it to 1.2v. Still testing and going lower to find the sweet spot

Lowering this is only possible with a hardmod.

For a 390 (hawaii) the stock memory voltage is 1.5v. Again, you cannot change this with software. You'll need to hardmod to change that.

For the 2** series you can change this with software.

I have the XFX R9 390, which I would like to reduce the memory voltage as the memory needs to run only at 1250 MHz.

What is the original stock memory voltage and the value after mod with your bios editor.

For your sapphire 390 cards, what is the stock memory voltage?

Srsly?  i had no idea this could run that stable tbh
and thx for the little movie
~CfA~

Well i'm @ -150mV at this moment and still running stable. Will let you know when i hit bottom..


Anyhow, for those that want to see some more in stead of some numbers i wrote down here.

A little video showing the first Rom (the one i shared here), a quick run, nothing special, just stock rom with nothing extra changed.

Link To Movie

Turn down your sound and sorry for the "not so optimal" quality..

How low can the memory voltage go? What was the original memory voltage? Just want to save some energy.

Yeah but i can do that in Afterburner for the Sapphire R9 390. So not needed to mod the bios.

Have you changed the R9 390 memory voltage before? It seems we only need 1250 MHz memory speed instead of 1500 MHz.

You could try HawaiiBiosReader (check a couple of post above..)

What program do you use to mod the R9 nano.

I would like to mod the R9 390 memory voltage. We do not need faster memory for Eth.

yeah i'm sorry about that.. could have shared it sooner.. my bad!

390 isn't bad either! You'll have fun with that as well!

Greetings!



Changed the OP with some new info :-)

The R9 Nano modded Rom comes out a few days too later. I already bought some R9 390. Otherwise, I would have bought sapphire Nano.

yes but some considerations are; max gpu per rig and ability to resell gpu's when mining goes PoS or unprofitable.

nano's smaller form factor make them pretty desirable for some scenarios, even when newer and more powerful gpu's are out in the wild.. the 970gtx is already the little brother to the 980.. not sure it would fetch the same price in 18 months time.

That's the one

The R9 390 bios can be editted by the HawaiiBiosReader
https://github.com/OneB1t/HawaiiBiosReader

I do not have experience with it.

Got 96 nano's running for weeks with my rom. No issues. The issues start when i go lower than -125mV.

Believe me, you can't imagine how much testing i've done...


Well, you've got a point there. But like i've said, secondary bios switch. The risk to screw one isn't "that" high. If you go to low on the volts it will just crash the display driver and reset itself. So no risk there.
If you "OVER"volt, then yeah, you could risk screwing it up.

170Mh/s, 6cards, 1500watt, true. Those cards are getting pushed, i haven't mentioned that i upped the Powertune to 50 which will also consume some extra energy.
Bumping the cards from 1000 core clock to 1050 core clock will gain you an easy 10Mh/s at only 60-70 watt extra (Complete rig)

Again, my power draw is all from the wall. So Motherboard, cpu, Memory, 6 cards that have to get power, 6 risers that all need some power.

If i do this test on 1 card, directly seated into the PCI slot (which i have done) the power draw is A LOT less.

I haven't really calculated on this to happen either. But it's still okay

Yes indeed, it didn't drop very hard.
Although. When using a stress program like 3DMark the memory controller will be using A LOT more of energy, because basically the memory will be used :p

When mining Ethereum, or any other algo, the memory on Fiji isn't really being used at it's fullest. Well, Almost not.

So cranking that down to -100mV was basically logical for me to do as it's not needed.

(-100mV will still be perfect for the HBM mem to run on 500clock at full load) "Stress test in 3DMark".



You could create one

I believe there are plenty of Hawaii tutorials out there :p

if you have questions, just ask, no worries!



Thx!
Well i got a nice discount because i bought in bulk :p

Well, it's probably the same as like i've done.
Just different numbers.

I believe i have seen an Hawaii Bios Editor somewhere. Just don't know where. So that could be easy to do.

Dunno for Tonga though.

Eliovp,
Excellent initiative, albeit a risky one.  Those cards cost around $500-520 each?

Would you happen to know how to undervolt an R9 380X by BIOS mod?
I tried the Hedzin BIOS reader, but that didnt work on on my card.

Is there R9 390 mod? The default memory speed is 1500 MHz, but we only need 1250 to mine Ethereum. So memory voltage mod is useful.

Thanks for the good efforts.
So the memory consumes very little energy. With -100mV, power drops from 1100 to 1055W.