hey folks,
this may not be related to this forum
pardon my english.. for the couple of a days im going nuts, suddenly, my gpus (i have many of them) are running (all of them in x8)
when i am inserting in x8 pcie, it will run x4 and so on.. at first glance, i tought its a specific mobo issue (i have z390 ace and master) but when i used x570 and b550 everything is fine i have troubleshooted everything i mean everything, reseated cpu, checked contacts, wiped with electro spray (pcie and the socket), changed drivers.. it doesnt matter if i use m.2 sata or nvme, even without enything its still in x8 (in x16 slot, and its in x4 when its in x8 slot) i am not a fool and have a good knowledge in pc,
in my z390 ace and master i cant change gpi bandwidth, (in ace you can change gpu pcie generation) the first pcie slot would always be x16 with , i tried with 9700kf, 9900k, i also have 8700k but i doubt it will change anything. sure this wont change the fps, but i like my system when its running perfect (i do ran 4300 ram with all tight timings)
3 Comments
probably lane sharing,
how many M.2 SSDs or SATA drives are installed?
Have you tried to change it in bios? That’s an old motherboard, theoretically it should be fine but are you sure you’re not taking up too many PCIe lanes and forcing it in x8 mode unintentionally?
What GPU do you have in that slot? Some GPUs are only wired for X8 mode, so they will never run at X16, no matter which slot you put them in. You mention that it worked in an X570 board, does that mean it was running at X16 there? The Z390 Ace seems to wire all 3 X16 PCIe slots into the CPU, so you are not loosing the bandwidth because you have the wrong M.2 Slot populated, that’s for sure. So if it’s not going to X8 mode because of another device, and you have not set up the X8 bifurcation in the BIOS, then my next thought would be that the card is X8 only, like a 4060 or something.