Question Not enough 8 pin CPU cables

[Old and Clueless]

I’m working on a PC Build with my son for his first computer. I have a Corsair 1000HX PSU that a friend gave me and the problem I have is the PSU only has 1-8 pin CPU cable and the Gigabyte Aorus Z690 MB we purchased has 2-8 pin CPU jacks. We will be using this with an i7-12700KF CPU.
From everything I can find, the second 8 pin is only really necessary if he wants to get into OC.
So to the question, should I just forgo the second 8 pin connector and tell him not to OC unless he gets a new PS or is there a cable that we can purchase to use the 12V and Gnd pins from two of the modular PCIe ports that are not being used on the PSU?

 

[Satan-IR]

Welcome to the forums!

Which exact Auros Z690 board is this? There are several models. On a side note, how old is the HX1000 your friend gave you? How long has it been working?

What does the motherboard manual say about the second 8-pin EPS/12V? If the manual explicitly states that the second one (both 8-pins) as necessary the board would probably not boot with just one 8-pin conencted.

If it's not mentioned as necessary board would probably boot with just the one 8-pin connected to ATX-12V-1 or whatever it might be called which is also printed in manual and on the board. The second one as you said is usually needed when you intend heavy overclocking on higher end CPUs with higher power draws. To distribute and balance the electrical load on cables, to prevent overheating, failure and possible ensuing fire etc.

You should be able to find PCIE->EPS/12V adapters for the specific PSU, from trusted vendors. Mabe even Coesair customer support in that regard.

Note: pinout mappings are not necessarily the same between dfferent PSUs, even within a brand series, namely HX here. Therefore, pinouts for PCIE output header on PSU might be different between Corsair HX1000 and Corsair HX1200. Even between different revisions of say HX1000 (if there are any). The pinouts can change too. There is no universal standard/regulation when it come to PSU pinouts.

So, If you search for adapters from PSU PCIE output to CPU 8-pin EPS/12V make sure you see it is explicitly mentioned that it's designed for the HX1000 (revision numbers included if applicable).

Or better yet, see if system boots with just the one 8-pin EPS/12V connected and is stable for now. Don't do any overclocking now or any other heavy load such as stress testing the CPU and so on, and later purchase a good quality PSU with two 8-pin EPS/12V headers/cables.

 

[geofelt]

The aux eps connectors deliver added power for the pcie slots as well as for higher cpu demands from overclocking,
Most gamers, these days do not overclock, but rely on the motherboard default turbo mechanism to boost the clock rates for one or two cores past what an all core overclock can do. Some motherboards are very aggressive about this by default.

Give it a try and see how you can do.
Using molex or sata adapters is not a good thing. If needed, contact corsair or a legitimate cable supplier and use only cables explicitly designed for your psu.

If you can, avoid the F suffix processors. The integrated graphics adapter can save you from diagnosing gpu issues. Not worth the $25 savings IMHO.

 

[Old and Clueless]

Welcome to the forums!

Which exact Auros Z690 board is this? There are several models. On a side note, how old is the HX1000 your friend gave you? How long has it been working?

What does the motherboard manual say about the second 8-pin EPS/12V? If the manual explicitly states that the second one (both 8-pins) as necessary the board would probably not boot with just one 8-pin conencted.

If it's not mentioned as necessary board would probably boot with just the one 8-pin connected to ATX-12V-1 or whatever it might be called which is also printed in manual and on the board. The second one as you said is usually needed when you intend heavy overclocking on higher end CPUs with higher power draws. To distribute and balance the electrical load on cables, to prevent overheating, failure and possible ensuing fire etc.

You should be able to find PCIE->EPS/12V adapters for the specific PSU, from trusted vendors. Mabe even Coesair customer support in that regard.

Note: pinout mappings are not necessarily the same between dfferent PSUs, even within a brand series, namely HX here. Therefore, pinouts for PCIE output header on PSU might be different between Corsair HX1000 and Corsair HX1200. Even between different revisions of say HX1000 (if there are any). The pinouts can change too. There is no universal standard/regulation when it come to PSU pinouts.

So, If you search for adapters from PSU PCIE output to CPU 8-pin EPS/12V make sure you see it is explicitly mentioned that it's designed for the HX1000 (revision numbers included if applicable).

Or better yet, see if system boots with just the one 8-pin EPS/12V connected and is stable for now. Don't do any overclocking now or any other heavy load such as stress testing the CPU and so on, and later purchase a good quality PSU with two 8-pin EPS/12V headers/cables.

It is the Gigabyte Z690 Aorus Elite AX Rev1.4. I was trying to balance price and performance and hope it is a decent choice.
My friend said it is probably 4-5 years old. It has not been used for the last 3 if that matters.

The manual is a bit vague and just talks about them being needed for stability. Other threads that I read said that it will boot as long as you have one connected. I’ll try booting on one and if that works. Then look for cables from Corsair or just upgrade the PSU.

Thank you for your help.

 

[Old and Clueless]

The aux eps connectors deliver added power for the pcie slots as well as for higher cpu demands from overclocking,
Most gamers, these days do not overclock, but rely on the motherboard default turbo mechanism to boost the clock rates for one or two cores past what an all core overclock can do. Some motherboards are very aggressive about this by default.

Give it a try and see how you can do.
Using molex or sata adapters is not a good thing. If needed, contact corsair or a legitimate cable supplier and use only cables explicitly designed for your psu.

If you can, avoid the F suffix processors. The integrated graphics adapter can save you from diagnosing gpu issues. Not worth the $25 savings IMHO.

Thanks for the insight. I’ll see how it goes with just one connected and go from there. It might be too late on the processor but I will check with Newegg. I went with the KF since I thought it would generate less heat since I have the GPU.
I appreciate the help!

 

[SkyNetRising]

I went with the KF since I thought it would generate less heat since I have the GPU.

What GPU are you using?
Does it really need 1000W PSU ?

 

[Old and Clueless]

What GPU are you using?
Does it really need 1000W PSU ?

GeForce RTX 3060 w/12GB. No, probably not but the price was right.

 

[SkyNetRising]

No, probably not but the price was right.

Price was right only because of bunch of needed cables missing.
Here - compatible CorsairHX 1000 (Type 4) cable kit.
Corsair Type 4 cables

For RTX 3060 - 600W PSU would be perfectly fine. No need for 1000W.

 

[Old and Clueless]

Price was right only because of bunch of needed cables missing.
Here - compatible CorsairHX 1000 (Type 4) cable kit.
Corsair Type 4 cables

For RTX 3060 - 600W PSU would be perfectly fine. No need for 1000W.

I should have been a little more clear. It was free. A friend gave it to me.
I’m going to see how it works with just the one supply and go from there. If my son really gets into it, I’ll look at upgrading.

 

[Satan-IR]

It is the Gigabyte Z690 Aorus Elite AX Rev1.4. I was trying to balance price and performance and hope it is a decent choice.
My friend said it is probably 4-5 years old. It has not been used for the last 3 if that matters.

The manual is a bit vague and just talks about them being needed for stability. Other threads that I read said that it will boot as long as you have one connected. I’ll try booting on one and if that works. Then look for cables from Corsair or just upgrade the PSU.

Thank you for your help.

No problem, glad to help. Not a bad choice it is a good board with a lot of features and capabilities. I asked for the exact model so we can check manuals and see what the manufacturer says about the second 8-pins being a must or not foor booting. Although it's a bit overkill if user doesn't plan on heavy overclocking on a high end CPU. Compared to mid-range boards it has more phases re voltage regulation and delivery (for demanding CPUs when overclocked) therefore the extra 8-pin 12volts header/connector.

If you plan to use the PSU for the time being you're best choice would be to get Corsair cables. And use the 8-pin from PSU to MOBO as it is intended and not use an adapter. I think I should have made that more clear in my previous post. Personally I'd get a new good quality PSU (based on the total system power requirement plus a little overhead) or if I wanted to use the free PSU for now I'd get a set of Corsair cables.

I’ll try booting on one and if that works. Then look for cables from Corsair or just upgrade the PSU.

Make sure you plug the one 8-pin in the one the manual specifies (if it does). More likely it should go in header/conncetor 1 (ATX-12V-1 or whatever it might be called in manual and on MOBO).

I think a good quality 650W PSU is the unit you need should you decide you want to buy one. Just make sure it has two 8-pin connectors and cables. You never know. You might want to overclock the CPU a bit later. Provided you have the cooler to keep temps in check.