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Fan & Air Flow advice on New Build

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Posted · Original PosterOP

Just built a new system and had some questions specific to Fans and Cooling. I have 3 Chassis Fan Headers, 1 CPU Fan Header and 1 CPU OPT Fan Header.


First question: What is CPU OPT used for? I've not seen it before.


Second question: I currently have a Rear Mounted Fan and a Top Mounted Fan, and 2 more fans for the front on order. I have the Rear Mounted fan plugged into the Chassis Header 1. Not sure where to put the Top Mounted so it's currently on Chassis Header 3. With the 2 fans I have coming should I just use a splitter and run them off Chassis Header 2, or run 1 off molex?


Final Question: This is a Gaming rig. (I'm only using fans no water cooling) Is optimal airflow still 2 intake in the front and 2 exhaust in the rear/top? Or is there a more efficient option?


Thank you.

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1. an extra fan header that is in sync with the main CPU fan header in terms of fan speed.

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: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally 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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1. CPU and CPU OPT header are tied together so "they will always run at the same speed"* (I have herd of some mother boards allowing de coupling of the headers, but not on any of the main stream boards I have worked on.) , generally made for Open loop water cooling using CPU temp as control.

2. It is complicated, it really depends on the case you are using, therefore if you are able to provide the Case model it may be easier for us to help you with fan placement planning.

3. Is tied to Question 2, really depends on your case and what you plan to have in the system, gaming or not a pc is a pc, the whole gaming thing is just a marketing thing.

P.S. if you are able to provide the parts list it could make recommendation easier


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CPU OPT can be used for a second fan that reacts to cpu temp. The fan does not have to be directly involved in the cpu cooling solution.


General practice is bottom and front intake, too and rear exhaust. At least one intake and one exhaust. Total number of fans does not usually make a great deal of difference as long as there is one in and one out.


Check your motherboard fan control software. Fan headers may be linked to particular motherboard temperature sensors. In which case the sensor location may suggest which fan(s) to put on which header. 


You can use a fan splitter or CPU OPT. The later may offer finer control. The former simpler configuration. It won't really make that much difference.


Use the motherboard fan headers and fan control software. This will allow you to configure the system for quieter and more efficient operation.


80+ ratings certify electrical efficiency. Not quality.


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Posted · Original PosterOP

The case is a NZXT H510. The motherboard is a Asus TUF Gaming X570-Plus (Wi-Fi). 


I tried out the CPU Opt first and while the fan started up at Boot it would shut off and never run after that. 

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Use the Asus Fan Xpert 4 utility to enable and set fan profiles for each header.

80+ ratings certify electrical efficiency. Not quality.


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