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PCIe Operation Asus ROG Crosshair VIII Hero

GenDufour
By GenDufour
in CPUs, Motherboards, and Memory
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Posted

Greetings!

 

I am looking to upgrade my PC from a R7 2700X to a R9 3900X (Note: The R7 2700X will be reused alongside its motherboard in another system). I have looked through many motherboards and have chosen the Asus ROG Crosshair VIII Hero as the motherboard I want to buy.

I'm faced with an inconvenience though:
I want to add in a NIC in the future for 10GbE connectivity. I saw the table in the manual regarding the PCI-E operation (Chapter 1.1.5 in the manual) but I can't really grasp it.
This is the conclusion I formed: I am not able to have my GPU in PCI-E x16_1 running at maximum bandwith, if I add the NIC.

 

Can I work something out by changing the operation of the slots, or is my conclusion (sadly) correct?

Either way, I would like to have informative answers so I can learn as well. :)
 

Spoiler

P.s. I have heard of the MSI Prestige X570 Creation which has 10GbE connectivity, yet I chose the Crosshair VIII Hero over it for the compatibility with other parts.

 

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The NIC should pull from the chipset lanes and not the CPU lanes, depending on which slot you plug it into. If you use the bottom slot then it will definitely pull from the chipset and not impact your GPU lanes. If I'm looking at it correctly only the top two x16 lanes will pull from the CPU directly.

Current Network Layout:

Current Build Log/PC:

Prior Build Log/PC:

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Posted

Hello GenDufour,

 

Don't worry, you'll use the full bandwidth of your GPU if you insert it in the first PCIe x16 slot. Then you can put your 10Gb NIC in any of the other PCIe slots (I would use the x1 slot if possible). 

 

 

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1 hour ago, GenDufour said:

I am not able to have my GPU in PCI-E x16_1 running at maximum bandwith

Dont put it in the second PCIe slot then. 10Gb LAN only needs PCIe 3.0 x2 to reach its full bandwidth, even chipset lanes will do.

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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20 minutes ago, Jurrunio said:

even chipset lanes will do.

Oh damn, I feel so silly for asking this question now that I went through the manual once again and found the expansion slot section.

 

Thanks anyway to all of you with your answers and my apologies for asking that. 

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  • 4 months later...
Posted
On 9/23/2019 at 4:01 AM, Lurick said:

The NIC should pull from the chipset lanes and not the CPU lanes, depending on which slot you plug it into. If you use the bottom slot then it will definitely pull from the chipset and not impact your GPU lanes. If I'm looking at it correctly only the top two x16 lanes will pull from the CPU directly.

Lurick... So the ROG Crosshair VIII Hero is designed for the top PCI slot to hold the GPU Card even though that means the fan on the HERO board will be covered by the video card... where as the next slot down would actually work better as a GPU Card slot as far as the design of the motherboard is concerned..? Odd, I figured I could use the lower or second large PCI slot for my video card ?

 

pardon my noob status and the necro-post

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11 hours ago, Quazar-Kid said:

Lurick... So the ROG Crosshair VIII Hero is designed for the top PCI slot to hold the GPU Card even though that means the fan on the HERO board will be covered by the video card... where as the next slot down would actually work better as a GPU Card slot as far as the design of the motherboard is concerned..? Odd, I figured I could use the lower or second large PCI slot for my video card ?

 

pardon my noob status and the necro-post

You could but it wouldn't impact temperatures in any meaningful way even if you used the top slot and covered the fan somewhat.

Current Network Layout:

Current Build Log/PC:

Prior Build Log/PC:

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