My goal is running multiple Windows OS with 3d support on those virtual machines. I in fact already have one such server with 4 watercooled cards on x99 chipset. The only thing I don't like with my existing Haswell-E solution is the USB graphics I use, but there I have an option of using a 1x PCIE GPU for host because all but one GPU I use were converted to single slot and the motherboard has 5 slots total. For this new server I want RX 580 cards that don't have a single slot conversion available. This means 4 cards on the board + Intel Graphics would be an ideal combination for me. I only need 1 USB connection for that server, so no need for more PCIE cards. Another option would be finding some server board with graphics chip and use xeon, linus tech style. I would prefer a single modern CPU to two old Xeons though and PCIe expansion box likely costs thousands just by itself. I can budget what I want in around 3 grand otherwise.
Also, Intel Graphics has its own GPU virtualization project going and while last time I check serious 3d load was crashing my kernel, I would really like to have an option to use it when it becomes stable. 2017-12-17 20:00 GMT-08:00 taii...@gmx.com <taii...@gmx.com>: > No matter what you get I would advise against getting a non-server board > where you won't be getting support for what they consider to be a server > feature, someone with a "gamer" board who says IOMMU works may have a > different revision than what is currently being sold - getting it working > is always a fluke at best, > > What are your goals for this build? What programs will you be running? > > > Honestly 4 dual slot cards on the same board is a really tall order and > wouldn't leave you with space for peripheral cards if you want real USB > controllers instead of emulated controllers. > You might consider buying a GPU type PCI-e expansion system such as the > ones from cyclone microsystems which are dual slot spaced and would leave > you with enough room for other cards. > http://www.cyclone.com/products/expansion_systems/600-2711.php > > If you don't need x86-64 and if you really need to max out the bus on your > video cards I would consider a POWER9 machine such as the TALOS 2, the > company who makes it has released firmware for other boards that has > excellent IOMMU groups and they actually reply to my technical support > emails. > https://raptorcs.com/ > > With two CPU present you would have 4 PCI-e 4.0 x16 slots with one of > those x8 electrical although they aren't dual slot spaced so you would need > either an expansion system or single slot cards such as the Radeon Pro WX > series. > POWER9 is about to be released and it has a variety of advantages such as > PCI-e 4.0 and 4 SMT threads per core for sforza. >
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