PSU for GTX 970 FTW+ & i5-4690k

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alvisdimpers

Commendable
Jan 14, 2017
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I have a basic rig that works fine but sometimes there are power cuts when I play demanding games.

I've got a ATX 750W PSU but the problem is it doesn't have the right cables to fully power the GPU and CPU. I've connected the GPU fine but my CPU requires an 8pin I don't have. I had to improvise a little with my current PSU. It work's, but is very sketchy and thus the power cuts. I also can't overclock the CPU because of how ghettoey it is hooked, it tells me there is not enough power.

GTX 970 FTW+ requires 1 PCIe 6pin and 1 PCIe 8pin cable, my motherboard also needs 1 PCIe 8pin cable. Can I get some good recommendations for a PSU with those cables?

TLDR: Need a PSU with 2x PCIe 8pins and 1x PCIe 6pin connector, 750W+
 
Solution
A
I know that setup very well.
image.png
. Is what I had in my PC before I upgraded.

https://www.newegg.com/Product/Product.aspx?Item=N82E16817151094 will handle the 970 with ease. It will also easily handle any GTX 1080(very nice upgrade:D) out there. I always have to look ahead to make sure I'm not putting up a roadblock for future upgrades. It's a quality PSU that I recommend for your rig.

I then moved over to a 650W 80+ Gold PSU and a new card.
2018_PC.png


750W is overkill imo. Over-provisioning is good, to point.
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bignastyid

bignastyid

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Jun 19, 2011
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volkgren

volkgren

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Aug 13, 2017
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OP is mistaken in that he only needs 1x8-pin and 1x6-pin for his GPU, and then he needs 1x8-pin CPU connector, not PCIe connector for his motherboard.

So, the 520W or 550W would be plenty.
 
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need4speeds

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Jan 6, 2009
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You can get a 6 pin pcie to 8 pin adapter cable so the correct power supply rails go to the card. I have one with my MSI GTX970, many shipped with one, maybe check in your video card box or ask a friend if they have one. At a store this adapter should be fairly cheap.

Most boards that use a 8 pin cpus plug will still work with 4 if the extra 4 are there a the larger atx power plug spot.(the atx plug has a extra 4 pins at one end, so some leave these blank while other atx plugs have the extra 4 pins, if your atx plug is filled then you can leave 4 of the 8 pins blank at the other spot)
-THE MOTHERBOARD DOES NOT USE A PCIE POWER CONNECTOR IT HAS IT'S OWN PLUG. (maybe that is what's wrong because a 750watt should not trip off that easily.)
-It's usually called a P4 plug and was made for the Pentium4 that was super high wattage and would sometimes burn out the atx pins. So they added a plug closer to the voltage regulators with 4 pins and called it the P4 plug. They then added a extra 4 pins to the atx plug and now the board's P4 plug has 8 pins. But your i5 only needs a extra 4 plugged in the rest if your power supply lacks them they can be left blank.
 
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aquielisunari

Judicious
Mar 31, 2011
6,499
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I know that setup very well.
image.png
. Is what I had in my PC before I upgraded.

https://www.newegg.com/Product/Product.aspx?Item=N82E16817151094 will handle the 970 with ease. It will also easily handle any GTX 1080(very nice upgrade:D) out there. I always have to look ahead to make sure I'm not putting up a roadblock for future upgrades. It's a quality PSU that I recommend for your rig.

I then moved over to a 650W 80+ Gold PSU and a new card.
2018_PC.png


750W is overkill imo. Over-provisioning is good, to point.
 
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Solution
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need4speeds

Distinguished
Jan 6, 2009
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Ok i know why it trips off now...

Oh the power cuts cause you have both 12volt rails connected together maybe. It's important if you have a power supply with 2 rails not to connect them together. So you have the P4 plug plugged in, and then extra wires from a molex plug, if it's from the opposite rail the two rails are shorted together. There are usually 2 strings of molex+sata power plugs, each one is on a separate rail. On most boards all the grounds and power pins on the 4 or 8 pin P4 plug are connected together meaning all the yellow wires connect to the same board trace and all the black wires also are together, this is also why you can leave 4 blank on most boards.

When you use the 6 and 8 pin pcie connectors on the video card, it is wired so the two rails do not connect together. This is important to keep in mind when using those molex to pcie adapters too.
 
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bignastyid

bignastyid

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Wow, that is just wrong. Thats not how a PSU with multiple 12v rails behaves at all. On a true multi rail PSU using 1 pci-e cable powered from 1 12v rail and one from another 12v rail is just fine, in fact in some configurations it is preferred as it will split the load between the rails so one is not overloaded.

Molex to pci-e adapters are never a good idea.

The 8-pin cpu power connector on the motherboard is called an EPC connector, P$ connectors are the 4-pon connectors that are rarely used anymore.

According to an older post by the OP they were using CX750 so it shutting down under load is not surprising as those units are fairly notorious for that issue. They also use a single 12v rail.
 
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