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Hey all,

about to order the parts for my new unraid server and i want to make sure im not gonna run into an issue with trying to use too many pcie lanes given my cpu.

CPU will be the 7820X so 28 lanes

Looking at this mobo - https://www.newegg.com/Product/Product.aspx?Item=N82E16813157778.

I will have a small gpu (R7 250 i believe) just since the cpu has no onboard video.

2x NVME SSD's (torn between optane and 960 evo).

The board will have all 8 sata ports in use.


from the board specs,

* If M2_1 is occupied by a SATA-type M.2 device, SATA3_0 will be disabled.
* If M2_2 is occupied by a SATA-type M.2 device, SATA3_1 will be disabled.

So since my drives are NVME either way, that wont apply right?

No issues with 1 gpu, 8 sata drives and 2 nvme drives?
 

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No issues.
BTW there are no M.2 on X299 using CPU lanes except ASRock X299E-ITX's 2 slots on the back (They support X299 exclusive RAID options so they're using CPU lanes)
 

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professional curmudgeon
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10,392 Posts
Hey all,

about to order the parts for my new unraid server and i want to make sure im not gonna run into an issue with trying to use too many pcie lanes given my cpu.

CPU will be the 7820X so 28 lanes

Looking at this mobo - https://www.newegg.com/Product/Product.aspx?Item=N82E16813157778.

I will have a small gpu (R7 250 i believe) just since the cpu has no onboard video.

2x NVME SSD's (torn between optane and 960 evo).

The board will have all 8 sata ports in use.


from the board specs,

* If M2_1 is occupied by a SATA-type M.2 device, SATA3_0 will be disabled.
* If M2_2 is occupied by a SATA-type M.2 device, SATA3_1 will be disabled.

So since my drives are NVME either way, that wont apply right?

No issues with 1 gpu, 8 sata drives and 2 nvme drives?
i believe sata M2 ssd will cause sata ports to be disabled. a NVMe ssd may cause pci-e x1/x4 slot(s)s to be disabled depending on the CPU.

https://www.asrock.com/MB/Intel/X299 Killer SLIac/index.asp#Specification
- 4 x PCI Express 3.0 x16 Slots*
- 1 x PCI Express 3.0 x1 Slot**
- Supports AMD Quad CrossFireX™, 3-Way CrossFireX™ and CrossFireX™***
- Supports NVIDIA® Quad SLI™, 3-Way SLI™ and SLI™***
- 1 x Vertical M.2 Socket (Key E) with the bundled WiFi-802.11ac module (on the rear I/O)
- 15μ Gold Contact in VGA PCIe Slot (PCIE1 and PCIE3)

*If you install CPU with 44 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/x16/x8.
If you install CPU with 28 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/x8/x0.
If you install CPU with 16 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/x0/x0 or x8/x4/x8/x0.
Supports NVMe SSD as boot disks

**If PCIE4 slot is occupied, M2_2 slot will support M.2 PCI Express module up to Gen3 x2 (16 Gb/s).

***3-Way CrossFireX™ and 3-Way SLI™ are only supported with CPU with 44 lanes
 

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Adclock.net
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3,752 Posts
God I love how gimped x299 is for lanes compared to threadripper
 
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