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Polaris Bios Editing ( RX5xx / RX4xx ) - Page 278

post #2771 of 3378
Thread Starter 
Quote:
Originally Posted by Y0shi View Post

@generaleramon
Strange behaviour with the MODv2.1.rom regarding CSM on/off.

I've flashed the RX580 BIOS while CSM was completely disabled in BIOS. I just did a CMOS_CLEAR on my Mainboard, so CSM is enabled again. If i try to disable CSM now, I can't enter the Mainboard BIOS again. OS is loading just fine, but I'm not able to enter the mainboard BIOS. If I flash back to the stock RX 480 BIOS, everything works as it should and I can enter the BIOS even with CSM disabled.

Maybe the original GV-RX580GAMING-8GD.rom isn't the best choice? Are you able to try a different BIOS as a base? E.g. https://www.techpowerup.com/vgabios/191274/191274

Sure!I can try...but i don't know when i have some free time... wink.gif
post #2772 of 3378
That would be awesome. Just tried the PowerColor BIOS I mentioned earlier. This works just fine, doesn't matter how often I switch CSM on or off. smile.gif
post #2773 of 3378
Could anyone point me to right direction regarding overclocking the memory on RX-480P8DFA6? Getting tons of errors. even 2000->2005 I get errors. 2100mhz RX580 bios posted by @generaleramon gave me 300k errors the first 10 seconds of heaven benchmark and it has UberMix timings. Had to modify the bios down to 2000mhz. Even on the RX480 stock bios, memory OC not possible. Is it the chip that doesn't like memory OC? Core OC is good. 1400@1150mV stable. Thanks.
Edited by risotto - 5/2/17 at 10:48am
post #2774 of 3378
Still no good BIOS for the RX 580 4GB?
post #2775 of 3378
Dear Friends

im have Sapphire RX 480 Nitro (not nitro +)

My memory is Elpida

What values im need to change beloe to overclock ?





Thanks
Almir
post #2776 of 3378
Dear Friends

my memmory is elpida

anybody can help to overclock my RX 480 Nitro 4gb (not nitro+)

Thanks
Almir
Edited by almirfiorio - 5/3/17 at 6:30am
post #2777 of 3378
Guys I'm trying to complete my RX Nitro+ OC to RX 580 bios mod (I'm almost done!) I just need some info/help:

1 - Is there a way to mod a bios to support another kind of memory? I'm trying to make a Hynix to Samsung mod, I changed vram name, vendor id, memory straps and it seems to work. Is there any other things to do? Is there a guide somewhere?

2 - I'm trying to mod the default memory controller voltage, the chosen RX 580 bios uses 950 mV (3B6 Hexadecimal, B6 03 little endian) and the default RX 480 Nitro uses 1000 mV (3E8 Hexadecimal, E8 03 little endian). PolarisBiosEditor does not support to change that value (it's say so but it doesn't). I used used ATOMBIOSReader.exe and HxD and found that the memory controller voltage should be stored at offset 1D, from the start of the "PowerPlayInfo" table, and also at the end (the last two bytes) of "VoltageObjectInfo/VRAM_GPIO_DetectionInfo" table. Is this correct?

3 - What kind of impact do loadline slope (you can see it with VRMTool) have? Since RX 480 Nitro+ OC uses 0.700 Ohm, but this current bios uses 0.500 Ohm.
Edited by Vento041 - 5/3/17 at 6:35am
post #2778 of 3378
1) not sure, someone else may know here
2) that would be nice to find out because some 580 use 1000, some use 950. I use 906, because my memory doesn't overclock well at all anyway

3) load Line slope, sounds like how the card measures current/power. I noticed some BIOSes report way lower or higher numbers on my 480, if that sets the calibration for the ammeter shunt than that makes sense, but how do you change it?

Also if you run one of the bioses that are way off reading watts/amps, your power tune is wrongly throttling or never throttling.
post #2779 of 3378
Quote:
Originally Posted by robnitro View Post

1) not sure, someone else may know here
2) that would be nice to find out because some 580 use 1000, some use 950. I use 906, because my memory doesn't overclock well at all anyway

3) load Line slope, sounds like how the card measures current/power. I noticed some BIOSes report way lower or higher numbers on my 480, if that sets the calibration for the ammeter shunt than that makes sense, but how do you change it?

Also if you run one of the bioses that are way off reading watts/amps, your power tune is wrongly throttling or never throttling.

2) can you try to see if your bios default value is stored at the same offsets as I said?

3) I2C registers.... VRMTool if you want to do it from windows (it will last until a complete shutdown, not with reboots) or with bios modding but it could be hard (you need to have space to do it, or you might need to change tables length = hard)
post #2780 of 3378
Vrmtool doesn't work on my card, i think because it's not reference.

I will look for the memory voltage but my bioss is default 950. If you know a 1000 mv 580 bios, that would be a better way to make sure that is the correct area. On the 7950 I never had luck modifying vmem, there were 2 toes, 1500 and 1600 mv
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