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Asus B250 Mining Expert BIOS Settings (PiMP OS v2.6+)
With the massive number of users who are running this board, I have decided to redo/update this post. I will attempt to create four (4) major sections: Preface/Notices, nVidia-only Config, AMD-only Config, and Mixed GPU Config.
The time and number of GPU's I have available for this testing is limited, so don't expect this guide redo/update to be completed immediately or to showcase a 19-GPU setup.
Start this guide from the beginning to make sure you cover the Preface/Notices section, then jump to the layout that matches your build.
Okay, let's get started...
In order to achieve the advertised 19 GPU setup, you must use special GPU's. Specifically, 8 of the 19 GPU's must be P106-100 (or P104-100?) GPU's as per the below image taken from the Asus B250 Mining Expert manual.
The P106-100 GPU is a mining-only GPU. It's basically a nVidia GTX 1060 without any video output ports (with a modified GPU BIOS). Retail nVidia GTX 1060's can be used on this motherboard, however, they won't count as the required P106-100 GPU's.
The max number of retail (non P106) GPU's this motherboard will support is 13. The moment you add the 14th GPU (no matter what PCIe slot order you use), the motherboard will not post.
B. Motherboard's BIOS
You must be running at least v1010 BIOS for PiMP OS to work correctly.
As of 20190514, BIOS v1207 is the most current and the one I used to make this guide.
You can get the most current BIOS from the Asus website: Here
** Note: Due to the way the Asus website works, you may have to search for it.
If you see something like in the below pic, you will want to click the "See All Downloads" (Notice that first file, MEUpdateTool?... this is not a BIOS file.) This is a proper BIOS file.
I'm not going to cover how to update the motherboard BIOS in this guide. (maybe in a future update?) There are a ton of videos/guides already covering this already. Once you have verified/updated to at least v1010 (v1207 preferred), you can begin the steps below.
C. BIOS CSM/Secure Boot
Due to the way this motherboard handles the "CSM" & "Secure Boot" features/settings, anytime you are messing with them, you will need to set the board to Optimized Defaults first. (See below... and yes, this will overwrite any settings you've previously made. You'll just have to remake them.). Because of this, I suggest you make all your CSM & Secure Boot settings first, then adjust everything else as needed.
Set Optimized Defaults (Note: Disregard this step at your own sanity.)
After entering the BIOS you will want to move all the way to the last tab "EXIT" and select "Load Optimized Defaults".
Next, save the changes (even if it says nothing was changed), reboot the machine, and re-enter the BIOS.
Running 8 nVidia GTX 1060's
Settings Main Tab AI Tweaker Tab Advanced Tab Advanced Tab - System Agent (SA) Configuration Advanced Tab - System Agent (SA) Configuration - Graphics Configuration Advanced Tab - System Agent (SA) Configuration - DMI/OPI Configuration Advanced Tab - System Agent (SA) Configuration - PEG Port Configuration Advanced Tab - PCH Configuration Advanced Tab - Onboard Devices Configuration Advanced Tab - Onboard Devices Configuration - Serial Port Configuration Boot Tab Boot Tab - CSM (Compatibility Support Module) Boot Tab - Secure Boot Boot Tab - Boot Configuration
Step 3: Save and Reboot
Now head back over to the last tab, "Exit" and click the "Save Changes & Reboot". The system should now see your PiMP OS v2.6+ SSD and boot normally.
** Note: If in doubt of your settings or you wish to reset them, be sure to restart this process with Step 1. Again, due to the way this motherboard handles the "CSM" & "Secure Boot" features, failing to do this step will most likely cause problems.
Mixed GPU Config:
Happy Mining, PiMP's!
Some more questions
On the Asus b250 Mining expert motherboard, do you also like Doc use the aux4pin Molax power connectors next to the pcie slots - what do they achieve? Many thanks. Re same psu, is that due to power regulatory? So if I have a 11 card rig can use 2 aux power connectors or should I use all 3?
Can I use adapters going from the same psu of course as I only have two Molax power cable for my psu
I do like Asus though, as Up to now have been using the Asus b250f gaming motherboards, but thought with the price of the mining expert being so low now is the time to try it out
From RoyKiiii (in PiMP Discord)
I have a lot of b250 mining expert experience. I do use the aux ports, make sure they are all connected to the SAME PSU.
Its technically meant to provide additionally power to the pcie sockets for when full sized graphics cards are used or when the board is providing power. However, the majority of us already use powered risers, therefore not much power gets used by those auxiliaries. From my understanding its to create a common shared ground for less interference and detection on card fault/removal etc.
Yes more importantly its to create a common ground. Would definitely install the aux power cords, Because we dont use much power off the board sockets. I'll also mention that its optional, many people dont use them.
The board is actually 3 sections, each section is separated in a way. That molex creates a common ground to reduce dirty power.
You should always use all 3 of the molex connections. If you don't have 3, I would just use a molex splitter 1to2.
Be warned that 11 cards must be a specific arrangement per the pdf slot placement
So thats for if you're using 3 psu's.
As you see there isnt much shared between sections. The molex on the left creates a "common ground"
I haven't tried 11 yet, 6 AMD RX580 is the most ive attempted. I wasnt just able to use the first 6 slots either!
Theres some guess and check involved, expect to power off and power on many times to get the right combination
Also dont ever disconnect a riser from a powered board,
Make sure to turn the main switch off the psu, or unplug the cable completely when removing risers. Sometimes power is stored in the capacitors that can damage the rise or the gpu.
Roy, thank you so much for your time / knowledge / and expertise really appreciate it. I goto send off a parcel but will be on later.
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