Author: GabryRox
Subject: X99 Extreme4 - can't get 5th GPU working
Posted: 24 Oct 2016 at 3:00pm
Thanks for the feedback. To address your first questions about sufficient power going to this 5th GPU... yes, in addition the USB connection from PCIe slot to x16 riser, I have molex power routed to it, as well as the 8 pin (6+2), both coming directly from the PSU. This is exactly how the other 3 off-board GPUs are set up and they work fine. So, I don't think it's a power issue... but you may be onto something regarding the 2.0 slot/x99 chipset issue. This also may be the reason that when I initially plugged in one of my MSI GPUs into this slot early on in my build, it was only getting 20% the mining hash-rate the other slots were getting. I know that some Mobos simply cannot support more than 4 GPUs but this being a higher-end Mobo, I was truly hoping that wouldn't be the case. Is there something in the BIOS that I can check/validate/change to address this issue?
Subject: X99 Extreme4 - can't get 5th GPU working
Posted: 24 Oct 2016 at 3:00pm
Thanks for the feedback. To address your first questions about sufficient power going to this 5th GPU... yes, in addition the USB connection from PCIe slot to x16 riser, I have molex power routed to it, as well as the 8 pin (6+2), both coming directly from the PSU. This is exactly how the other 3 off-board GPUs are set up and they work fine. So, I don't think it's a power issue... but you may be onto something regarding the 2.0 slot/x99 chipset issue. This also may be the reason that when I initially plugged in one of my MSI GPUs into this slot early on in my build, it was only getting 20% the mining hash-rate the other slots were getting. I know that some Mobos simply cannot support more than 4 GPUs but this being a higher-end Mobo, I was truly hoping that wouldn't be the case. Is there something in the BIOS that I can check/validate/change to address this issue?