@o0ragman0o i try to put 8 gpu on my MSI z97 gaming 5 but got error code 12 on windows device manager, i have done bios reset and try 6xgpu mod but to no avail. Any idea what can i do to make it work?
@hans, I've only run them on Ubuntu 14.04 server. But this suggests to me that the onboard GPU means your system is trying to init 9 GPU's rather than 8. On linux, each GPU needs 256Mb mapped to bios address space which is limited to 2Gb, so I imagine it's the same with Windows.
I just received the same 1 to 3 riser. Seems like riser is ok, but I cant start my rig with 8 gpu. 7 is max. When I try to start with 8 - nothing happens, even BIOS cant loads itself. Any Ideas? I am using Asrock H81 Pro BTC + Celeron G1840. Thanks for any help.
@hans, using SATA. The cable ends up laying along the back of the usb's so is occluded by timber and other cables.
can you see your switch with lsusb and cards with lspci?
@o0ragman0o, can you help me? I have one motherboard Gigabyte sockt 775, ddr II, 2gb RAM, core2duo. I conected 2 GPU to riser (1 to 3 PCI-e) to 1x slot, but the windows didnot start. Can it be the motherbord?:
@cpimentellc I'm not running windows, but Ubuntu Server 14.04. Have you tried plugging the switch into different PCIe slots? Some PCIe lanes are going to be mapped directly to the CPU while others will be coming of the chipset. The 16x slot would likely come from the CPU and so takes out one variable. It shouldn't really matter what the switch is attached to though as the PCIe spec is designed for tree topologies of hubs and lanes, but the 1x is likely going through an on board switch in the chipset.
I think a lot of the problems perhaps stem from BIOS memory addressing where each GPU the memory allocation requires a 256Mb window where as BIOS only addresses 2Gb leading to the 8 GPU limit. You mentioned 2 GPU's, is that all you have?
Also when you say windows did not start, were you seeing a POST screen, have you tried the monitor across all GPU's including the onboard one?
@cpimentellc I'm not running windows, but Ubuntu Server 14.04. Have you tried plugging the switch into different PCIe slots? Some PCIe lanes are going to be mapped directly to the CPU while others will be coming of the chipset. The 16x slot would likely come from the CPU and so takes out one variable. It shouldn't really matter what the switch is attached to though as the PCIe spec is designed for tree topologies of hubs and lanes, but the 1x is likely going through an on board switch in the chipset.
I think a lot of the problems perhaps stem from BIOS memory addressing where each GPU the memory allocation requires a 256Mb window where as BIOS only addresses 2Gb leading to the 8 GPU limit. You mentioned 2 GPU's, is that all you have?
Also when you say windows did not start, were you seeing a POST screen, have you tried the monitor across all GPU's including the onboard one?
I just received the same 1 to 3 riser. Seems like riser is ok, but I cant start my rig with 8 gpu. 7 is max. When I try to start with 8 - nothing happens, even BIOS cant loads itself. Any Ideas? I am using Asrock H81 Pro BTC + Celeron G1840. Thanks for any help.
i have the same problem, even wont enter bios with 8 gpu, h81 pro btc + g3260
I also tried this 1x3 PCIe switch on a Msi Z97 Guard pro motherboard. I can get 7 gpu running but when I installed the 8th I can't boot. Get stuck on bios splash screen. Any suggestions how to get 8 GPU going? I have a I7 4790k installed.
I also tried this 1x3 PCIe switch on a Msi Z97 Guard pro motherboard. I can get 7 gpu running but when I installed the 8th I can't boot. Get stuck on bios splash screen. Any suggestions how to get 8 GPU going? I have a I7 4790k installed.
Comments
btw can 1 mobo support more than 7 gpu?
Have you tried disabling the onboard GPU in BIOS?
Maybe i need to try uninstall all driver before installing the 8th gpu
When I try to start with 8 - nothing happens, even BIOS cant loads itself. Any Ideas?
I am using Asrock H81 Pro BTC + Celeron G1840.
Thanks for any help.
I have one motherboard Gigabyte sockt 775, ddr II, 2gb RAM, core2duo.
I conected 2 GPU to riser (1 to 3 PCI-e) to 1x slot, but the windows didnot start.
Can it be the motherbord?:
I think a lot of the problems perhaps stem from BIOS memory addressing where each GPU the memory allocation requires a 256Mb window where as BIOS only addresses 2Gb leading to the 8 GPU limit. You mentioned 2 GPU's, is that all you have?
Also when you say windows did not start, were you seeing a POST screen, have you tried the monitor across all GPU's including the onboard one?
Tank you.
h81 pro btc + g3260
i wonder if pentium can only 7 gpu max
Didnt know the 8 GPU limit comes from the bios limitations.
The risers themselves look like made by the same design as our usb single risers.
Will try to get one of those and turn my 4 gpu rig into 6-7.