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when do I "need" to buy a motherboard that has an 8pin cpu pwer

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The 8400 should work with a single 4-pin but you shouldn't build a PC with those parts now.

What's your budget for the parts?

Desktop: Intel Core i9-9900K | ASUS Strix Z390-F | G.Skill Trident Z Neo 2x16GB 3200MHz CL14 | EVGA GeForce RTX 2070 SUPER XC Ultra | Corsair RM650x | Fractal Design Define R6

Laptop: 2018 Apple MacBook Pro 13"  --  i5-8259U | 8GB LPDDR3 | 512GB NVMe

Peripherals: Leopold FC660C w/ Topre Silent 45g | Logitech MX Master 3 & Razer Basilisk X HyperSpeed | HIFIMAN HE400se & iFi ZEN DAC | Audio-Technica AT2020USB+

Display: Gigabyte G34WQC

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@Mateyyy around 600-700CAD.(but im targeting for 600)
 

6 minutes ago, Mateyyy said:

The 8400 should work with a single 4-pin but you shouldn't build a PC with those parts now.

What's your budget for the parts?

its the only ones that fit in my budget.

also back to topic.
when do I NEED to worry about the 4pin vs 8pin thing?

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20 minutes ago, poor_man said:

@Mateyyy around 600-700CAD.(but im targeting for 600)
 

its the only ones that fit in my budget.

also back to topic.
when do I NEED to worry about the 4pin vs 8pin thing?

You'd be better off by going with a 3300X and a decent B450 board like an MSI B450M-PRO VDH MAX, and ditching the 1650 in favour of an RX 570, which you can find for pretty cheap especially used.

But back to topic, you NEED to worry about the lack of an 8-pin with anything above that i5-8400. Not necessarily that you'd need more than 150W for even a locked 9700, but because the VRMs on that board are trash and Intel Coffee Lake CPUs are far from being efficient. In fact, I personally wouldn't put even that i5 in an H310 board as they're all junk, but it should work.

Desktop: Intel Core i9-9900K | ASUS Strix Z390-F | G.Skill Trident Z Neo 2x16GB 3200MHz CL14 | EVGA GeForce RTX 2070 SUPER XC Ultra | Corsair RM650x | Fractal Design Define R6

Laptop: 2018 Apple MacBook Pro 13"  --  i5-8259U | 8GB LPDDR3 | 512GB NVMe

Peripherals: Leopold FC660C w/ Topre Silent 45g | Logitech MX Master 3 & Razer Basilisk X HyperSpeed | HIFIMAN HE400se & iFi ZEN DAC | Audio-Technica AT2020USB+

Display: Gigabyte G34WQC

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8 minutes ago, Mateyyy said:

You'd be better off by going with a 3300X and a decent B450 board like an MSI B450M-PRO VDH MAX, and ditching the 1650 in favour of an RX 570, which you can find for pretty cheap especially used.

But back to topic, you NEED to worry about the lack of an 8-pin with anything above that i5-8400. Not necessarily that you'd need more than 150W for even a locked 9700, but because the VRMs on that board are trash and Intel Coffee Lake CPUs are far from being efficient. In fact, I personally wouldn't put even that i5 in an H310 board as they're all junk, but it should work.

this is base on tdp, correct?

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5 minutes ago, poor_man said:

this is base on tdp, correct?

Well the TDP doesn't really reflect how much power the CPU will actually pull. My 9900K can draw around 150W of power at full load at the stock 4.7GHz boost speed, despite its mere 95W rated TDP.

The 8400 could probably pull upwards of 90W, maybe even more, under a 100% AVX load. During gaming though, it should probably be more in the 60-70W range I'd expect, depending on how CPU intensive the game you're playing is.

Desktop: Intel Core i9-9900K | ASUS Strix Z390-F | G.Skill Trident Z Neo 2x16GB 3200MHz CL14 | EVGA GeForce RTX 2070 SUPER XC Ultra | Corsair RM650x | Fractal Design Define R6

Laptop: 2018 Apple MacBook Pro 13"  --  i5-8259U | 8GB LPDDR3 | 512GB NVMe

Peripherals: Leopold FC660C w/ Topre Silent 45g | Logitech MX Master 3 & Razer Basilisk X HyperSpeed | HIFIMAN HE400se & iFi ZEN DAC | Audio-Technica AT2020USB+

Display: Gigabyte G34WQC

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