Firepac
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Just recently purchased the Z370 Classified K with 4x 16GB of Corsair DDR4 RAM (CMK32GX4M2A2400C14). The RAM is listed as compatible but my PC will not POST with 4 sticks of RAM in it. I have tested each individual RAM stick and it works fine. I have also tested each individual DIMM slots and it works fine as well. I have even tested the motherboard with 3 RAM sticks in every configuration and it boots just fine. But as soon as the 4th stick goes in it will not POST and I get a motherboard error code C. I even updated the BIOS to the latest version (1.07) and nothing seems to work. Am I missing something here?
My CPU is a 8700K. Please help!
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Sajin
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 17:49:52
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Firepac
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 18:12:39
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Sajin
Try reseating the cpu.
Already tried that and didn't work. There are no bent pins or anything. I have already exchanged the motherboard, the CPU, as well as the RAM on amazon btw. Still the same problem. All I have is the motherboard, the CPU and the RAM sticks installed btw and nothing else.
post edited by Firepac - 2018/06/20 18:23:35
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DamonLynch
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 18:26:11
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I'm running 4x16 GB Crucial in an Z370 FTW and it works fine. Don't know what to suggest.
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Firepac
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 18:32:29
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DamonLynch
I'm running 4x16 GB Crucial in an Z370 FTW and it works fine. Don't know what to suggest.
That's technically a different motherboard.
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Sajin
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 18:44:19
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So you're essentially running two kits of CMK32GX4M2A2400C14? If yes, that is most likely your issue. Memory sticks that are sold together in a kit have been tested by the manufacturer, and are guaranteed to work together, but there's no such guarantee with two kits purchased separately.
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Firepac
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 19:11:16
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Sajin
So you're essentially running two kits of CMK32GX4M2A2400C14? If yes, that is most likely your issue. Memory sticks that are sold together in a kit have been tested by the manufacturer, and are guaranteed to work together, but there's no such guarantee with two kits purchased separately.
They are 2 of the same kit and is shown to be compatible with this motherboard in 64GB configuration.
post edited by Firepac - 2018/06/20 19:13:19
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Firepac
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 20:12:21
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DamonLynch
I'm running 4x16 GB Crucial in an Z370 FTW and it works fine. Don't know what to suggest.
Are you running one 64GB kit or two 32GB kits?
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Sajin
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 20:40:14
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Firepac
Sajin
So you're essentially running two kits of CMK32GX4M2A2400C14? If yes, that is most likely your issue. Memory sticks that are sold together in a kit have been tested by the manufacturer, and are guaranteed to work together, but there's no such guarantee with two kits purchased separately.
They are 2 of the same kit and is shown to be compatible with this motherboard in 64GB configuration.
Yes, I know, and the kits are guaranteed to work as separate kits, but aren't guaranteed to work together like you're trying to do.
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DamonLynch
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/20 20:41:25
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Firepac
DamonLynch
I'm running 4x16 GB Crucial in an Z370 FTW and it works fine. Don't know what to suggest.
Are you running one 64GB kit or two 32GB kits?
Two 32 GB kits brought on different months from different retailers, back in 2016 when you could pick up a 32 GB kit for $135.
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Cordorb
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/21 17:33:28
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I am using 32 GB with 4 CMD16GX4M2B3000C15 same MB 2 kits
Sajin may have ideas on clocking if you can't get new memory to try at this time.
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Firepac
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/21 21:00:40
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Cordorb
I am using 32 GB with 4 CMD16GX4M2B3000C15 same MB 2 kits
Sajin may have ideas on clocking if you can't get new memory to try at this time.
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Are you running them at 3Ghz? If not what frequencies are you using? I would like to know what frequencies to try. I have my doubts that it's because I'm using 2 kits. I already ordered a 64GB kit just in case.
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Tech_JoseC
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/22 20:40:17
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Hello Firepac, Bummer to hear that you are experiencing troubles with your memory kits. If they are working as individual kits, I would first install the first kit, set your DIMM voltage to 1.350V, save your BIOS settings and shut down your PC. Install your second kit of memory and attempt to go back into BIOS. If you are able to do so, enable XMP profile 2. If enabling XMP causes issues, you are going to need to manually set your timings. Good luck!  -Jose C.
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Firepac
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/23 14:59:25
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Sajin
So you're essentially running two kits of CMK32GX4M2A2400C14? If yes, that is most likely your issue. Memory sticks that are sold together in a kit have been tested by the manufacturer, and are guaranteed to work together, but there's no such guarantee with two kits purchased separately.
Okay the 64GB kit works and everything boots up perfectly now. Thank god you were right. I was about to pull my hair out in frustration.
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Sajin
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/23 16:23:47
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KenMcC
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/06/25 08:51:24
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Sajin got the info and knowledge down pat. Always buy your memory as complete kits. Sometimes you can luck with purchasing memory at different times.. luck of the draw. 
KenMcC Z170 Classy K; i7-6700 CPU, Corsair CMK16GX4M2A2400C14 Seasonic SSR-360GP 360W; Samsung 950 Pro M.2 256 GB Samsung 850 Evo 500 GB SATA Samsung 850 Evo 256 GB SATA Samsung SSD 840 Series 250 GB SATA Samsung 860 EVO 1 TB SATA Windows 10 x64 Prof.
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51synister
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/08/05 10:23:26
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I'm having the SAME problem. I bought 2 32GB kits of the same memory, but only two sticks work at a time.
Oddly enough, when I first built this PC I had all four sticks installed and everything ran perfectly until a few weeks ago when I started getting this weird 4C error.
The only fix I have found so far is to only run 32GB (2 sticks) at a time instead of 64GB (four sticks). I've played with voltages, timings and everything but haven't been able to get all four sticks to work together again. I even replaced my RAM, CPU and motherboard ... still getting same results.
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Sajin
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/08/05 11:39:31
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51synister
I'm having the SAME problem. I bought 2 32GB kits of the same memory, but only two sticks work at a time.
Oddly enough, when I first built this PC I had all four sticks installed and everything ran perfectly until a few weeks ago when I started getting this weird 4C error.
The only fix I have found so far is to only run 32GB (2 sticks) at a time instead of 64GB (four sticks). I've played with voltages, timings and everything but haven't been able to get all four sticks to work together again. I even replaced my RAM, CPU and motherboard ... still getting same results.
Time to try a completely different kit other than the ones you have now.
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Whitherward
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Re: EVGA Z370 Classified K won't POST with 4 sticks of RAM.
2018/08/09 11:30:31
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Had a similar issue with Z370 Classified K + 4x8GB Corsair C15 3000MHz Sticks
Installed 1 pair -> BIOS -> XMP profile -> 3000MHz + 1.35V
Installed OS / drivers / etc -> Rebooted
Now added second pair -> BIOS without booting -> Automatically detected 32GB and XMP -> Rebooted
Works!
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