Reasons for X99-E WS:
- Xeon and even new gen CPU support
- 88 lanes compared to 40 lanes
- eSATA support
- 12K capacitors
- QCode Logger POST debug
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Uhm, I am personally set for WS, although you sorted it out.
The reason is that 4th and 5th PCIe slots share bandwith with SATA Express and M.2 ports,
so only way to get both PCIe and storage performing well is to get WS with extra lanes for that.
And 5820K lacks lanes, even if you get WS it will support only 28 of them, e.g. it would be only worse.
I use heck of storage - 14 TB across 8 drives, and plan getting M.2 and SATA SSDs so these ports are very important for me, and I don't want to give them up to PCIe slots.
I am set for 5960X to get all eight cores - I also want to get as much RAM as possible e.g. 64 GB RAM.
For myself - am building a advanced server with gaming capabilities as well (using Hyper-V with RemoteFX).
And not a server board since it lacks a lot of features that X99 Deluxe/X99-E WS has to offer.
Not interested in neither Rampage (overclocking is not a priority), nor other vendors.
Also, if onboard sound does not satisfy me, I will definitely get extra audio card, X99-WS gives lanes for that.
But according to my finance, and situation in my country, purchase period is ~4 years, and I am also waiting for Xeons (that WS supports as well) and even newer gen processors to come out.
And also - only X99-E WS has eSATA ports that I use pretty much as well (for even more storage).