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Simultaneously windows gamer and newby ubuntu user (qemu/kvm, vga passthrough)

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I suck at introductions, hi.

I can probably manage without hand-holding but i reckon i will avoid many dumb mistakes with some good advice.

As the title implies i intend to use a single PC to simultaneously run windows and ubuntu without rebooting.
(My gamer habit is a bit excessive, i'd never become a linux user with dual boot.)

Afaik i have the hardware support for doing this?
1. Should have vt-x, might have to enable in bios
2. Slightly concerned about a PCI-E card used for Sata3 and USB3, the SSD does have somewhat higher read speeds via that extension card than the onboard Sata2

Specs:
Motherboard Asus P6T
CPU Xeon W3520 (very similar to i7 920)
Memory triple channel 3x2GB Corsair CMX6GX3M3A1600C9
Current GPU (guest) Sapphire HD7870
Old repurposed GPU (host) XFX HD5770
PCI-E sata3, usb3 extension card Delock 89359
System SSD (connected via PCI-E extension card) Corsair Neutron 256GB cssd-n256gb3-bk
Daily use HDD storage 2x500GB (connected straight to motherboard Sata2 I/O ports) Samsung HD501LJ and Seagate ST3500630NS
Network connected via gigabit port on the motherboard

I can't remember the last time i even used the DVD-RW drive so i don't really care if that somehow doesn't work.
Pretty typical wired keyboard and mouse, don't expect problems with that.
Don't really expect problems with monitors either.
A wired xbox 360 gamepad
Occasionally used USB microphone Samson Go Mic

Graphics tablet XP-Pen Star 03 alternatively Wacom Intuos CTH-480/S (highly prefer/must have the XP-Pen one due to larger size and button layout)
I will most likely be using Krita most of the time so long as the graphics tablet functions properly, in the worst case i will fall back to using windows for drawing.

Some questions i have:
Can i install ubuntu studio on the windows system drive while keeping the windows installation intact? (Different file systems? Possible to shrink existing NTFS volume to give room for Ubuntu?)

How fast/slow is ubuntu studio on a 7200 HDD compared to an SSD? Maybe it's better to just dedicate one of the 500GB drives or a portion of it to Ubuntu?

How should i expect most of my devices to behave with a virtualized guest windows? Will a typical USB plug and play device (like a gamepad) work as on any other windows computer or does the virtualization complicate things?

Don't really expect anyone to know this but would two different GPUs cause the 16 lane PCI-E to work in v1.1 mode rather than v2.0? For example when i swap the x4 sata exension card over from the slower third slot to one of the first two full x16 lane slots, GPU-Z then reports the GPU working at v1.1 rather than the normal v2.0. A block diagram for x58 chipset if that helps.

Anything obscure i should know beforehand about qemu/kvm and pci-e passthrough?

Thanks in advance.

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