Ryzen 9 5950x in MPG X570S Carbon Max WIFI

jkalte159d02e1

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I have placed a Ryzen 9 5950x in MPG X570S Carbon Max WIFI, but it doesn't show anything on the screen and the "CPU is not detected or fail" light is on. Does this motherboard need an update or is the CPU broken?
 

citay

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Déjà vu... same CPU, same board, same problem. Try updating to the latest BIOS using the Flash BIOS Button. Also, list all your hardware please.
 

jkalte159d02e1

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I didn't connect cpu_pwr1 and cpu_pwr2. If I connect both or only cpu_pwr1 (4*2) nothing works: no fan or lights. If I connect only cpu_pwr2 it boots into bios settings. My M.2 SSD is detected, but my Samsung 840EVO SSD is not. Too old? For what do you need these 8 SATA connections than old drives?
 

Alan J T

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I didn't connect cpu_pwr1 and cpu_pwr2. If I connect both or only cpu_pwr1 (4*2) nothing works: no fan or lights. If I connect only cpu_pwr2 it boots into bios settings. My M.2 SSD is detected, but my Samsung 840EVO SSD is not. Too old? For what do you need these 8 SATA connections than old drives?
Can you list full build and part used make and model of PSU as well
 

Alan J T

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For what do you need these 8 SATA connections than old drives?
I have 6 SATA III SSD in my system used for storage, so they are of use as you may need the extra storage, With most Motherboards only having one or two M,2 Drives having the sata allows one to add extra drives as needed
 

jkalte159d02e1

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I just had to make some changes in the system settings (CSM) and change the SATA slot used, thereafter I could boot from that old SATA SSD.
On my previous computer I used a 4.0 PCIE adapter card placed in my motherboard to use an M.2 drive. You had to boot from another drive.
I still haven't CPU_PWR1 connected; maybe it is only needed for updates. Not very practical because it is very difficult to reach and see.

Power supply: Enermax Maxpro II atx 400Watt
Corsair Vengeance LPX 32GB (2 x 16GB) DDR4 3600 (PC4-28800) C18 1.35V
Cooler: Noctua NH-U12S Redux
Graphic card: MSI N730K-2GD3H/LPV1 NVIDIA GeForce GT 730
 
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citay

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I see now what your problem is.

Power supply: Enermax Maxpro II atx 400Watt
Maxpro II is classed as "Tier E • Avoid" on the PSU tier list. This is the second-lowest rating, just above "Replace immediately", and very clear sign of a bad PSU model.
It's only certified for 80PLUS White EU (230V), which is always a bad sign. It points to an outdated technical design, most likely with low-quality components.

Furthermore, the quality, efficiency and general capabilities of the PSU are woefully inadequate for a 5950X, a beast of a high-end CPU.
I would get rid of this PSU at the earliest opportunity and get a higher-quality one. Like, i would not run this another day if i could help it. I wrote a Guide: How to find a good PSU.

Then you will most likely see that you can connect both EPS 8-pin CPU power plugs to the board, or just to PSU_PWR1, and it will work.

Also, your Enermax MAXPRO II 400W doesn't even have two EPS plugs for the CPU, it only has one. So what you tried to connect there was most likely one of the PCIe power plugs.
 

Alan J T

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I just had to make some changes in the system settings (CSM) and change the SATA slot used, thereafter I could boot from that old SATA SSD.
On my previous computer I used a 4.0 PCIE adapter card placed in my motherboard to use an M.2 drive. You had to boot from another drive.
I still haven't CPU_PWR1 connected; maybe it is only needed for updates. Not very practical because it is very difficult to reach and see.

Power supply: Enermax Maxpro II atx 400Watt
Corsair Vengeance LPX 32GB (2 x 16GB) DDR4 3600 (PC4-28800) C18 1.35V
Cooler: Noctua NH-U12S Redux
Graphic card: MSI N730K-2GD3H/LPV1 NVIDIA GeForce GT 730
400 watt PSU on a CPU that can pull over 220 watts ya that will be a problem pleas look for 650 watt or better if you plan to upgrade the GPU to high end you will need 750 to 850
 

jkalte159d02e1

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400 watt PSU on a CPU that can pull over 220 watts ya that will be a problem pleas look for 650 watt or better if you plan to upgrade the GPU to high end you will need 750 to 850
I determined these 400 Watt using a calculator (https://netzteil-rechner.net/r/ba8rS) where I specified all the components of the computer.
It does work with only the cpu_pwr2 (4 pin CPU power) connected. So then these 400 Watts are enough. Why should connecting also the cpu_pwr1 (8 pin CPU power) connector increase the power usage so much that nothing works anymore? Because now overclocking is turned on?
More likely it shouldn't be connected for normal usage or it is wrongly connected.
Before I buy another power supply I should be certain that it will make a difference.
 

citay

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Did you not see my post, by any chance? This is a very low-end, budget PSU, which is no way equipped to deal with the transient load a 5950X can put on a PSU. It's most likely a group-regulated design with double-forward topology, using too cheap and too undersized components. Furthermore, on the well-respected PSU Tier List, it's marked as "Avoid". I wouldn't even use this for a 5600X, let alone a much more powerful 5950X.

It's not about the board turning on with the 5950X inside. When it turns on, it draws under 50W most likely. But once you really create some load for this 16C/32T CPU, and have some short transient loads going, the minor rails can drop severely in voltage with this group-regulated PSU, and the voltage ripple can go through the roof.

Also, the efficiency of this PSU is very bad for modern standards, so the heat losses inside the PSU under maximum CPU load will be significant, seriously increasing the internal PSU temperatures,
which either the fan will have to counteract, or the cheap capacitors inside will age in record time. I could go on and on about what's wrong with using such a PSU for such a system.

It's not even primarily about the wattage. You can perhaps get away with using a high-quality 450W PSU for this PC, yes. But you haven't bought a high-quality unit, you have bought a model that's rated as "Avoid", two full tiers below "Low-end". This very fact alone should make it very clear why i would replace this PSU as soon as possible. There are so many factors going into a Tier rating, so there would have been lots of red flags for this model to be rated so poorly on there. It's a failure waiting to happen. Heck, i think your initial problem was surely because of it already.

As i've mentioned, your PSU doesn't have two 8-pin EPS12V plugs or even an 8-pin EPS12V and a 4-pin ATX12V:

ener.png



Also, you should become acutely aware that just because something is listed as compatible somewhere, it's not always a good idea to pair certain hardware with each other.
The hardware has to match. You can't put a high-end CPU into a low-end board or the VRM section will fry and lead to throttling, for example.

5950x.png


Similarly, you shouldn't pair a high-end CPU with a poorly rated, bad-quality, low-end PSU. This will not go well for long.

Finally, i will refer to my Guide: How to find a good PSU again, in hopes that this explains some more things about what differentiates a good PSU from a bad one.
 
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jkalte159d02e1

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As i've mentioned, your PSU doesn't have two 8-pin EPS12V plugs or even an 8-pin EPS12V and a 4-pin ATX12V:

View attachment 162432
Now I understand the problem. I used the PCI-E 6+2 Pin for the 8 pins CPU power. When I put the other CPU 4 pins there, it still works. They are somehow different. That is at least something I can use to select another power supply.
 

Alan J T

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Yes very different and im surprised it fitted in the socket with out using force
1659886531245.png
 

jkalte159d02e1

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Yes very different and im surprised it fitted in the socket with out using force
View attachment 162436
They look the same. The only difference is were exactly square shaped pins are located. To put5 the 6+2P PCI express connector into the CPU-8 socket you have to put some thinner pins into square shaped holes. It is not more difficult than using the 4+4P CPU connector.
I first put the 4+4P CPU connector in the CPU-8 socket and later removed it because the other 8 pin connector was split in 6 and 2, so couldn't be used for the CPU-4 socket.
The first time, when I did it the right way, I had the most difficulty. Later it was easier.
 
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Alan J T

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Plugs are keyed but as you notice they can be forced to fit with a bit of extra pressure.
 
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