Topic: [UPDATE] RX480 (Ref) 31+Mh, Custom Rom - VDDC OFFSET + Custom timing - page 20. (Read 231045 times)

Show your hwinfo64 screen (gpu mem error rate) before claiming the win ))

Aha! Good job!

It's only Elpida supported i assume

http://dodaj.rs/photos/20161003147552593191355.png

win 

480 4GB Elpida -29mhs

Thank you for the answer.
I've never build a mod myself, not sure if it is really safe !
I found my memory type is Hypnix, in case it would be enough to find an already moded one safely?

How flash CMD, or dos?

Several days ago when i got some of these, and with my 5 hours experience with hex i managed to change the timings and tried to flash it and it worked, so i guess no need for checksums... Turns out they are great elpida chips, 8 out of 8 work in 2000mhz on 1500 strap. the hynx are less then half, at least with my experience.

Hi guys,
do you have some link to moded BIOS for
4GB Sapphire RX470 , Reference ? (the one with a 6pin PCI and only one fan)
Edit : Memory type Hypnix
Windows7

Thanks a lot !

EDIT 2 :
it looks like that

FB, Frame buffer, yep, that makes sense! I was hurting my head trying to think what FB stood for. lol

I can get 100% utilisation on the FB and still have memory errors, there might not be many. But i'm trying to find highest clock with zero errors as opposed to just highest hashrate. Maybe I should not worry about the memory errors if hashrate still goes up? I'm right in thinking the memory errors are corrected? It's ECC RAM right?

Have you noticed the "limp mode" issue before? It's different to getting memory errors which makes the hashrate fluctuate. Sometimes cards go into this limp mode and cause no errors at all.

It's literally like the card puts an x% limit on your memory bus utilisation. I've had it limit as low as 27% before. Seems the only way to fix it is to restart PC and try again.

Not sure if it might even be a driver issue... Or maybe it's a Sapphire Nitro+ issue as my reference card has never done it to me yet.

FB stands for Frame Buffer, And yes, as long as this isn't 100%, you're generating memory errors. You don't even have to check HWinfo to know.

Because the core and memory are in a way connected to eachother, raising or reducing your core clock will also solve this issue

Greetings

I just got 6 Sapphire RX480 Nitro+ too.

So far my findings are that almost none of them will go higher than 2125~2150MHz stable on the memory.

When I push the memory too high, I will either get lots of memory errors according to HWINFO and this causes hash rates to fluctuate. Whereas sometimes it's almost like the memory bus is put in "limp mode" upon starting claymore miner. When this happens I don't tend to get memory errors but I can see that memory bus utilisation will be lower. As in, it might just sit at 50% and never go any higher.

For example, the first two cards I tested I set memory to 2250MHz like my reference card. I fired up claymore miner and while my reference card started mining at 31mh/s, the other two cards were only mining at 14mh/s and the memory bus utilisation was really low.

So I set memory speed back to 2200MHz on the two nitros and restarted the miner. Now I was mining at over 30mh/s on all three cards. But both nitros had fluctuating hashrates.

so I fired up HWINFO and found all three cards producing lots of memory errors, but especially the two nitros.

After much testing I've found that both these two nitros will only do 2125MHz without causing memory errors or entering limp mode. The reference card is quite happy at 2150MHz without producing errors. The other four nitros are all slightly different too, but generally 2125MHz seems to be the magic number on the bus. Incidentally, they'll all do 1150MHz on the core at just 900mv!

In short, if one card is giving you much lower hashrates, it's probably because it can't handle the high clock rate on the memory. I'd highly recommend using HWINFO to track memory errors and memory bus utilisation. In MSI AB, the utilisation is known as GPU FB. If your cards are not going upto 100% and sitting there most of the time then the bus is in "limp mode".

Hope this helps.

MSI 480 4GB Mod Bios hashrates
https://bitcointalksearch.org/topic/msi-rx-480-x-gaming-4gb-no-reference-30mh-custom-rom-1631483

What does

set -ethi 12

command do?

Anyone have configuration for the msi 480 version or the bios on here listed on OP are good for all or just reference? Seen the sapphire been uploaded by a member nice one for that will no doubt use for the sapphire if I get one debating to go MSI or Sapphire cant decide anyone want to decide for me.

MSI 480?
Sapphire nitro 480?

It's maybe broken.
Did you restart ?

Do you guys know why one of my flashed Sapphire 480x nitros always ends up with a hashrate of 18 while all my others have 29 ?

Me already am!

yup! You gonna gotta rich become very ))

hehhe how manuel please help 

You have to manually fix checksum. Yey! Another win!

http://dodaj.rs/photos/20161001147533401350132.png

red is hynix strap
green is elpida.

yellow as memory timings
strap 1500 to 1625, 1750 and 2000, but I can not make checksum in polaris bios editor 1.4