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I meant that you won't be able to be reading AND writing from NVME_1 --> NVME_2 while you are also READ/WRITE to HDD_1 & HDD_2 from the other NVME for example....
Yet, even Reading from NVME_1 and copying to NVME_2 at FULL bandwidth depends on certain factors such as:
Your motherboard and its m.2. topology E.g. whether it allows you to set the GPU PCI-E slot to 8X and release the 8 remaining lanes and use them with 1 or 2 m.2 slots on board. Remember each NVME drive needs 4X PCI-E lanes for full bandwidth and you have 16X lanes from the CPU and 4X lanes from the chipset connected directly to the CPU (the 24 Chipset Lanes are not direct but a hub for everything LAN/USB 3.0/ 1 or 2 NVMEs / SATA and they all communicate with the CPU via a 4X PCI-E link.
So if you have your GPU set at 16X in order to use 2X NVMEs at full speed at the same time you would need 8X Lanes and you simply don't have them unless you reduce the GPU to 8X (not an issue in your case) and the M/B allows setting 1 or 2 NVME slots to CPU through the remaining 8X lanes..while the other goes through the the chipset 4X link. It might be the case that you need an NVME PCI-E card for this to happen but for this you need to study the motherboard manuals.
Honestly, in your case I would seriously consider going on a X299 platform and a 10 Core CPU and then you get 44 PCI-E lanes and no such limits now or in the future for 4K/8K video. That's what these platforms are made for.
This is from Asrock and the Z390 Taichi
*M2_1, SATA3_0 and SATA3_1 share lanes. If either one of them is in use, the others will be disabled.
If M2_2 is occupied by a SATA-type M.2 device, SATA3_3 will be disabled.
M2_3, SATA3_4 and SATA3_5 share lanes. If either one of them is in use, the others will be disabled.
It looks like there is no way to set any of the M2 slots to directly communicate with the CPU via PCI-E since all are wired through the DMI Link (the chipset) meaning that you have 4X Lanes that ALL of them Have to share with SATA/USB/LAN...
With 3 M2 drives you lose the following SATA ports:
Out of the 8 SATA ports you are left with 3 and after you connect your 2X HDDs with one.
The big issue here is that ALL those + LAN/USB/SAT share the same 4X PCI-E lanes so you can do the math.
However, please note that the 970 EVO cannot sustain max speed for long anyway (that is what the Pro is for and why more expensive) so the "cripple" effect won't be that noticeable but everything depends on how you use them and how heavy you multitask.
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