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Stupid MOBO CPU power question.

DonBaldy
By DonBaldy
in CPUs, Motherboards, and Memory
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Go to solution Solved by Jurrunio,

Dont need the 4pin if you have the 8, this is true.

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Building a new system using the GIGABYTE X570 AORUS ELITE WIFI mobo. For CPU power it has an 8+4 connections. This is the first mobo I've used with anything more than an 8 pin. I've seen many, many you tube videos where it was stated that unless doing extreme OC'ing that it isn't necessary to plug in the extra 4 pin. IS this accurate?

 

Second question is I'm using the NZXT c750 PSU and it only has one connection labeled CPU. If the 4 pin is necessary where would it plug into on the PSU? The PSU did come with two cables labeled CPU. Would it plug into an PCI-e slot on PSU?

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Dont need the 4pin if you have the 8, this is true.

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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5 minutes ago, DonBaldy said:

Would it plug into an PCI-e slot on PSU?

No, dont do that. Looked up your PSU, you should have 8pin and 4 pin (or 2x 8pin) for the CPU. If you dont, you are fine with 8 pin alone.

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10 minutes ago, Jurrunio said:

Dont need the 4pin if you have the 8, this is true.

 

9 minutes ago, Levent said:

No, dont do that. Looked up your PSU, you should have 8pin and 4 pin (or 2x 8pin) for the CPU. If you dont, you are fine with 8 pin alone.

Thank you both. I should add that the CPU is Ryzen 5 5600x

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That CPU consumes up to 100-120 watts.  Technically, it would run just fine even with just a single  4 pin connector and cable, and with the 8 pin connector it will be very happy. 

The extra 4 pin cable would be pointless. 

 

The single 4 wire cable can give around 200 watts to the CPU, and the 8 wire cable is rated for around 330-350 watts (not quite double the 4  wire cable for safety reasons, they intentionally rate it a bit less even though physically the wires and pins in connector are same) 

So the 8 wire cable alone is at least 3 times better than what the CPU needs, so adding more wires won't make a difference.

 

 

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2 minutes ago, mariushm said:

That CPU consumes up to 100-120 watts.  Technically, it would run just fine even with just a single  4 pin connector and cable, and with the 8 pin connector it will be very happy. 

The extra 4 pin cable would be pointless. 

 

The single 4 wire cable can give around 200 watts to the CPU, and the 8 wire cable is rated for around 330-350 watts (not quite double the 4  wire cable for safety reasons, they intentionally rate it a bit less even though physically the wires and pins in connector are same) 

So the 8 wire cable alone is at least 3 times better than what the CPU needs, so adding more wires won't make a difference.

 

 

Thank you very much for the detailed answer.

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Thank you all for your help. I'm adding this post to say I'm a dumb azz!. The mobo only has the 8pin not 8+4 as I'd thought but I'm grateful to learn something.

 

I guess I've been looking at so much hardware I got confused. Board won't physically be in my hands until tomorrow

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