Hello everyone, I've been following this thread for a while but I just *had* to create an account and rant (kinda) a bit and also for future reference for some people that wanna try what I'm doing.
/*rant*/
For the last two years I've been using a couple of m920q with no issues, they are amazing machines. These machines blew my mind after I got pci risers, I managed to get some NICs and a T600 gpu and got to learn so much with them.
By the end of last year I found (for me) a one in a life time offer, 3 m90q i7 12th gen for WAY below its price tag. I just couldnt say no, I had to buy those. I was finally able to get my own "little" cluster. So I bought 3 $50+ risers (the 16x version/ 8x electrical according to this thread) and started to use 2 gpus on two of them. Everything went smoothly ... till a couple of days ago. In my country is VERY difficult to get pc parts used in this type of endeavours and I wanted to get the intel arc a310 as I saw it working on a minisforum MS01, to be honest I wanted to try AV1

. After waiting for someone to bring that gpu I was so excited to finally test it... but with no avail, it just didn't get recognized by the OS, the fan spinned for a while but thats all. I spent a whole weekend trying to make it work, several combinations and tweaks in BIOS, up to 3 bios or more (cant remember) updates. Trying power adapters of more capacity... nothing seemed to work.
Until by the end of sunday something told me to try the gpu on my good old m920q... and it just worked. I never expected this, I was tired and just went to bed.
/*end-rant*/
To resume my hardware and experiments:
- M920Q:
- PNY T600, 4 port NIC and Intel arc a310 eco with 01AJ940 = WORKS
- m90q 3rd gen:
- PNY T600 with 5C50W00910 = WORKS
- 4 port NIC and Intel arc with 5C50W00910 = WONT WORK (at least for me, not idea why)
What I *assume* is the following (both of these are mentioned in the first post, section "
PCIe slot, riser, and add-in cards"):
- M90Q G3 has the x8 PCI-E slot wired to the PCH (as mentioned here by user cadillac before)
- Which seems odd, my PNY T600 according to specs is "PCI Express 3.0 x16" and m90q gen3 is PCIe x8 Gen 4. Unless theres some magic I dont know how to explain, the T600 works fine. I even used it in VMs using passthrough.
- According to SPARKLE page, the specs says PCI Express 4.0 x8 and requirements "PCI 3.0, 4.0 or 5.0 compliant motherboard with one graphic slots". As I said this card worked fine in m920q (which is only pci 3.0 x8)
- Intel arc a310 "doesnt have the PRSNT (presence) signals wired" (as mentioned by user cromo with another type of card)
- To be honest, not sure if the solution mentioned would work. I'm kinda afraid to make some wrong contact and making everything explode. But again, the card works in m920q so..
For me (or at least my reasoning is), because of the PCI not being wired directly to the CPU and is wired to the PCH might be the problem but I don't want to completely say this is the reason as the T600 gpu works fine in the m90q gen3. My understanding of PCI lanes and PCH distribution is minimal at best
Hopefully this information helps someone trying to use the a310 eco on a m90q (or at least on a gen 3) as I haven't found posts here or else trying this configuration. (or if someone has some kind of solution, better yet

... tempted to buy 5C50W00933)
Take care everyone