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Asus Maximus XI Gene - DIMM.2 - PCI-E x8 ???

 
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post #1 of 6 (permalink) Old 10-31-2018, 01:59 PM - Thread Starter
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Asus Maximus XI Gene - DIMM.2 - PCI-E x8 ???

Yeah, seems like a very nice board for overclocking, but what the hell is up with its DIMM.2 M.2 "extension" slot?

If I understand it correctly, populating the DIMM.2 slot inevitably leads to setting the PCI-E slot to x8 instead of x16, since DIMM.2 is wired directly to the CPU's PCI-E lanes instead of Z390 chipset. Why would anyone like/do this? x8 is going to be a bottleneck for modern GPUs. I was seriously considering the Gene for my new CFL-R build, but not like this. Essentially, DIMM.2 slot is rendered unuseable due to this and I simply don't understand why Asus has implemented it this way? Yes, it's nice to support 4 M.2 drives in theory, especially on a mATX board, but like that, I feel it's very counterproductive and also not obvious to unsuspecting customers that it will limit PCI-E to x8, unless reading the specs very carefully... Kinda strange, I'm not sure what to think of it.
(btw, I think it's the same for the Extreme, not sure though.)

Last edited by vvoid; 10-31-2018 at 02:08 PM.
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post #2 of 6 (permalink) Old 11-12-2019, 10:33 PM
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Is there some more detailed information on this somewhere?
I want to install 2 M.2 NVME drives so do I need to install them directly to the board and not use the dimm.2 slot to avoid making the main PCI-e slot 8x instead of 16x ?
Would I notice much difference in BFV if I did use the dimm.2 ?, not that I plan to.

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post #3 of 6 (permalink) Old 11-15-2019, 12:37 PM
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Quote: Originally Posted by munternet View Post
Is there some more detailed information on this somewhere?
I want to install 2 M.2 NVME drives so do I need to install them directly to the board and not use the dimm.2 slot to avoid making the main PCI-e slot 8x instead of 16x ?
Would I notice much difference in BFV if I did use the dimm.2 ?, not that I plan to.

There are two m.2 slots on the board under the pcb cover by the dimm.2 slot. Connect them there and your GPU will have full 16x link speed. Connect any more nvme drives to the dimm.2 riser will half your gpu link speed.

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post #4 of 6 (permalink) Old 11-15-2019, 12:47 PM
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Quote: Originally Posted by munternet View Post
Is there some more detailed information on this somewhere?
I want to install 2 M.2 NVME drives so do I need to install them directly to the board and not use the dimm.2 slot to avoid making the main PCI-e slot 8x instead of 16x ?
Would I notice much difference in BFV if I did use the dimm.2 ?, not that I plan to.
There is a 3% loss with a 2080TI going 8x instead of 16x. That many frames makes very little difference. Sure it's nice to see 3-5fps more but I doubt you'll notice them.

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post #5 of 6 (permalink) Old 11-15-2019, 08:57 PM
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Thanks for the replies. I have left the dimm.2 riser in the box as I only have 2 m.2 drives. Good to know I can add more with only a small penalty

CPU
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Cooling
EK 140D5 Pump, waterblocked CPU, Ram, GPU with 1 x 360mm and 1 x 420mm Radiators and Vardar Furious Fans
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Maximus X Hero
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EK 140D5 Pump, waterblocked CPU, Ram, GPU with 1 x 360mm and 1 x 420mm Radiators and Vardar Furious Fans
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post #6 of 6 (permalink) Old 11-22-2019, 04:44 PM
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Another issue I have with this board is, when I enter a setting in the bios to overclock the memory and it won't POST I go back into the bios after unsuccessful trainings and the settings have all changed for the vccio, vccsa, vdimm and main memory frequency. Why does it do this and is there a setting to disable/change this?
I had a bit of a look but couldn't see anything obvious.
1302 bios.

CPU
9900ks
Motherboard
Asus Maximus XI Gene
GPU
EVGA 1080 Ti Superclock 2 Black
RAM
F4-4400C19D-16GTZSW
Hard Drive
Samsung M.2 1TB 970 EVO Plus
Hard Drive
Samsung M.2 1TB 970 EVO
Power Supply
Corsair HX1200i
Cooling
EK 140D5 Pump, waterblocked CPU, Ram, GPU with 1 x 360mm and 1 x 420mm Radiators and Vardar Furious Fans
Case
ThermalTake V51
Operating System
Windows 10 Pro
Monitor
Asus PG349Q 34.1 inches 3440 x 1440 pixels @ 120 Hz
Keyboard
Corsair K95 RGB Platinum
Mouse
Asus Spatha Wireless Gaming
Mouse
Ligitech G602 wireless
Mousepad
1000x500x3
Audio
Steelseries Siberia800 wireless Headset
CPU
8700k @ 5.2ghZ
Motherboard
Maximus X Hero
GPU
EVGA 1080 Ti Superclock 2 Black
RAM
32GB 1xF4-4400C19D-16GTZSW & 1xF4-4400C19D-16GTZKK
Hard Drive
Samsung M.2 1TB 970 EVO Plus
Hard Drive
Samsung M.2 1TB 970 EVO
Power Supply
Corsair HX1200i
Cooling
EK 140D5 Pump, waterblocked CPU, Ram, GPU with 1 x 360mm and 1 x 420mm Radiators and Vardar Furious Fans
Case
ThermalTake V51
Operating System
Windows 10 Lite
Monitor
Asus PG349Q 34.1 inches 3440 x 1440 pixels @ 120 Hz
Keyboard
Corsair K95 RGB Platinum
Mouse
Asus Spatha Wireless Gaming
Mouse
Ligitech G602 wireless
Mousepad
1000mm x 500mm
Audio
Steelseries Siberia800 wireless Headset
CPU
i7-4770k
Motherboard
Asus Maximus VII Ranger
GPU
Gigabyte NVIDIA GeForce GTX980
RAM
G.SKILL Trident X 16GB 2 x 8GB 2400 Memory F3-2400C10D-16GTX
Hard Drive
Seagate Barracuda 2TB
Optical Drive
LG DVD Rom
Power Supply
PSU Coolermaster V1000W
Cooling
Custom Loop
Case
Case Thermaltake V51 Full Window
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Windows 7
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