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Issue with MSI MAG Intel B660M MORTAR DDR4 microATX power supply

Issue with MSI MAG Intel B660M MORTAR DDR4 microATX power supply

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ImRYON
Junior Member
9
11-29-2022, 10:47 AM
#1
I currently have an MSI MAG Intel B660M MORTAR DDR4 MicroATX and an i5 12400f processor. My power source is a Seasonic gx focus 750 watt unit. I’m thinking about switching to an RTX 4080 but need extra PCIe lanes unless I disconnect one of the cables from the motherboard. Will the board function with just one PCIe cable connected, and will the 750 watts provide enough power for everything?
I
ImRYON
11-29-2022, 10:47 AM #1

I currently have an MSI MAG Intel B660M MORTAR DDR4 MicroATX and an i5 12400f processor. My power source is a Seasonic gx focus 750 watt unit. I’m thinking about switching to an RTX 4080 but need extra PCIe lanes unless I disconnect one of the cables from the motherboard. Will the board function with just one PCIe cable connected, and will the 750 watts provide enough power for everything?

O
Oma_
Member
68
11-30-2022, 08:39 PM
#2
Your motherboard only requires a single 8-pin connector for the CPU, which works well with a 336W power supply. The additional connector is mainly for heavy overclocking. A 750W unit will suffice for an RTX 4080. I currently use a 7700X with 32GB DDR5 5600MHz and an RTX 4080 on a Corsair RM750i, and it performs flawlessly.
O
Oma_
11-30-2022, 08:39 PM #2

Your motherboard only requires a single 8-pin connector for the CPU, which works well with a 336W power supply. The additional connector is mainly for heavy overclocking. A 750W unit will suffice for an RTX 4080. I currently use a 7700X with 32GB DDR5 5600MHz and an RTX 4080 on a Corsair RM750i, and it performs flawlessly.

A
angeldust2016
Junior Member
5
12-19-2022, 08:39 PM
#3
It seems you're mixing up different types of cables—EPS for the CPU and PCIe for the graphics card. Let me clarify what each serves.
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angeldust2016
12-19-2022, 08:39 PM #3

It seems you're mixing up different types of cables—EPS for the CPU and PCIe for the graphics card. Let me clarify what each serves.

T
the5harkman
Senior Member
542
12-19-2022, 09:08 PM
#4
It's essential to remember this extra CPU power 8-pin cannot be linked to the graphics card.
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the5harkman
12-19-2022, 09:08 PM #4

It's essential to remember this extra CPU power 8-pin cannot be linked to the graphics card.

R
RemguixX
Junior Member
41
12-23-2022, 11:41 AM
#5
Your motherboard doesn't accept PCIe power cords—it requires EPS power cables. Your power source has two dual 8-pin PCIe connectors, and most RTX 4080 models come with an adapter that uses three of these to feed the GPU, which should cover your needs.
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RemguixX
12-23-2022, 11:41 AM #5

Your motherboard doesn't accept PCIe power cords—it requires EPS power cables. Your power source has two dual 8-pin PCIe connectors, and most RTX 4080 models come with an adapter that uses three of these to feed the GPU, which should cover your needs.

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bmarzano
Senior Member
449
12-23-2022, 03:02 PM
#6
That's correct. He has an 8-pin connector for the CPU on the motherboard, but the PSU doesn't have an extra PCIe slot for a GPU cable.
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bmarzano
12-23-2022, 03:02 PM #6

That's correct. He has an 8-pin connector for the CPU on the motherboard, but the PSU doesn't have an extra PCIe slot for a GPU cable.

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Fijiboys777
Member
196
12-31-2022, 12:33 AM
#7
It appears he doesn't understand the distinction between EPS and PCIe cables. The issue can be resolved by swapping out one of the EPS cables for a different PCIe cable that fits the card.
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Fijiboys777
12-31-2022, 12:33 AM #7

It appears he doesn't understand the distinction between EPS and PCIe cables. The issue can be resolved by swapping out one of the EPS cables for a different PCIe cable that fits the card.

J
JuanNWD2
Junior Member
12
12-31-2022, 01:37 AM
#8
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JuanNWD2
12-31-2022, 01:37 AM #8

D
demstur
Junior Member
35
12-31-2022, 03:52 AM
#9
Unless Seasonic's datasheet is incorrect, you don't have to remove an EPS cable since there are 5 CPU/PCI-E connectors on the PSU. Sorry about the upside-down picture - this is the layout shown in their datasheet PDF and I'm not bothering to flip it.
D
demstur
12-31-2022, 03:52 AM #9

Unless Seasonic's datasheet is incorrect, you don't have to remove an EPS cable since there are 5 CPU/PCI-E connectors on the PSU. Sorry about the upside-down picture - this is the layout shown in their datasheet PDF and I'm not bothering to flip it.

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PugCookie
Junior Member
22
12-31-2022, 04:46 AM
#10
They mistakenly believed EPS connectors were identical to PCIe Express, but actually they’re different. Swapping one EPS for a PCIe Express could help if you remove one and install the other, giving you the third connector needed for your GPU. I was curious about whether both EPS connections were necessary, especially since I can’t overclock 12th or 13th generation chips and still see instability. The photo shows the back of an 850-watt or higher unit, while a 750-watt model has only four EPS/PCIe ports.
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PugCookie
12-31-2022, 04:46 AM #10

They mistakenly believed EPS connectors were identical to PCIe Express, but actually they’re different. Swapping one EPS for a PCIe Express could help if you remove one and install the other, giving you the third connector needed for your GPU. I was curious about whether both EPS connections were necessary, especially since I can’t overclock 12th or 13th generation chips and still see instability. The photo shows the back of an 850-watt or higher unit, while a 750-watt model has only four EPS/PCIe ports.