Acer ASPIRE E5-575G-34PS motherboard — Acer Community
Hi, You have one HDD bay and a slot for M.2 SSD, you might be able to install a M.2 NVMe SSD but please check the link below, as for the memory, you can use DDR4 2400MHz SODIMM modules up to 32GB(2x16GB) ...
Dell 17.3" Alienware 17 R5 Laptop AW17R5-9729SLV-PUS B&H Photo
The 17 R5 has three SSD M.2 slots and one HDD/SSD 2.5" bay. You have not revealed which drive is your existing Windows OS (C:), so we have presumed that it is on a M.2 drive card.
How many SSD slots does this laptop have? – Q&A – Best Buy
It has the one that the Windows 11 is installed on (kind of hard to swap out because of metal frame that surrounds the SSD) and 1 additional open PCIE 3.0 slot for an additional M.2 NVME SSD (easy to install).
Can I Use a PCIe 3.0 Card in a 2.0 Slot? - PC Guide 101
Just to clarify, if you have an Intel motherboard with M.2 Gen 5 and M.2 Gen 4 and choose to install your SSD into the M.2 Gen 4 slot, you will not lose any PCIe bandwidth for the graphics card.