Build Advice Z790 and psu

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lexxz

lexxz

Dec 26, 2023
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Hey there. I'm currently working on a custom build, I have done some in the past however it's been more than 10 years since. As a result I am facing some confusions as far as what has changed since.

I slap the power and the light gets stuck on cpu. After some research I found the board more than likely needs a second 8 pin 12v plugged in. (Eps 12v?) I'll admit I don't know anything about electricity and had to do some searching to learn that they are different than the pcie connectors. Luckily I didn't try that but I can see how others make that mistake.

I believe my biggest confusion around this right now is getting that second one plugged in. According to PC part checker my psu and mobo are compatible however I don't see a second 8 pin on it to use. Is this a mistake potentially on their part or am I missing something? I do see an 8pin labeled 300w which I believe is for a graphics card. (Edit turns out I can't count and the 300w is 10 pin and clearly is wrong! Any help is appreciated, the manuals to these parts honestly stink real bad.


Setup is as follows
H7 flow, Be quiet 12m 550w, Gigabyte Z790 ud ax, i7 13700kf, 32gb vengeance ddr5 at 6GT. I plan to add a gigabyte 4060 eagle with it, but hit my budget where I'm currently at and figured I could grab it in a few weeks.
 
Last edited:
lexxz said:
Hey there. I'm currently working on a custom build, I have done some in the past however it's been more than 10 years since. As a result I am facing some confusions as far as what has changed since.

I slap the power and the light gets stuck on cpu. After some research I found the board more than likely needs a second 8 pin 12v plugged in. (Eps 12v?) I'll admit I don't know anything about electricity and had to do some searching to learn that they are different than the pcie connectors. Luckily I didn't try that but I can see how others make that mistake.

I believe my biggest confusion around this right now is getting that second one plugged in. According to PC part checker my psu and mobo are compatible however I don't see a second 8 pin on it to use. Is this a mistake potentially on their part or am I missing something? I do see an 8pin labeled 300w which I believe is for a graphics card. (Edit turns out I can't count and the 300w is 10 pin and clearly is wrong! Any help is appreciated, the manuals to these parts honestly stink real bad.


Setup is as follows
H7 flow, Be quiet 12m 550w, Gigabyte Z790 ud ax, i7 13700kf, 32gb vengeance ddr5 at 6GT. I plan to add a gigabyte 4060 eagle with it, but hit my budget where I'm currently at and figured I could grab it in a few weeks.
Click to expand...
Download the manuals of the Internet, for example the PSU has a good bit of info starting at page 47 (its Multilanguage type manual) Here. It shows the back slots and cables so you can get the correct pairing, and note footnotes for other wattage models.
 
Lucky_SLS said:
I see this is the specification page: https://www.bequiet.com/en/powersupply/4070

P4+4 (CPU)1
P8 (CPU)1

Should'nt that solve the issue of 2 x 8 pin EPS for you?
Click to expand...
Looking at the manual and cables from my linked pdf, the 550W only supports one 8 pin CPU power, while the 750W supports 2. The 650W has slots for two connectors but only comes with one cable according to its specs. His motherboard spec shows 2 8 pin connectors needed, as is common in Z790 boards.
 
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Lucky_SLS , I just finished a Z790 build with a 4070Ti and i9-14900K -- they are power sucking monsters, I went with a 1000W Seasonic Titanium (yeah, a little over the top but who knows what else I'll add). 🙄
 
^ thats great and it totally makes sense!

I would never get a 350W+ gpu. my electricity bills will go over the roof! I am content to stay at sub 350W. so i guess my choice of 850W should be fine for the time being...
 
Thanks for the response. I did download manuals online but have been having issues finding certain things, so thank you for pointing to the page. I do recall coming across that, I see the second p8 has a note saying 650w+ models as you mentioned. Perhaps the PC part picker has a mistake with that as I certainly used the 550 in the build on their site. I guess I'll have to return it and get another. Yay waiting another week to make progress because I'm poor!! Glad to at least verify I'm not simply blind. Thank you again!
 
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Alright follow up. I'm clearly too stupid to pick a PSU that works with this build. I check other versions of this saying it has the extra rail but I watch a video of someone to double check and while there's a second port labeled p8 it's 10 pin while the first one is 8???

Someone please suggest something in like 130$ range if possible? I'm totally lost and not ready to risk it.
 
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