Posted August 30, 2019 I have recently upgraded to an Intel I7 9900k and Asus strix Z390-E Motherboard. Before describing the issue i must say that i also had TWO Asus strix Z390-F Motherboards with the same issue - which I returned as I assumed were defective. This is now my third motherboard in a row with the same issue. This can't be a hardware problem right?!The issue I'm having is Ram related. All 4 DIMMS are working correctly as I have tested them one by one on this new Asus strix Z390-E motherboard and on my old Strix x399 Mobo and they all work correctly (I also ran mem test with no detected issues).The Problem is I can only use 3 DIMM Mobo slots at the same time - if I use all 4 the motherboard refuses to post and just lights up a DRAM LED and turns itself off and on in a loop.I have tested all slots individually and all the slots are working correctly. I just cant use all 4 of them at the same Time! Can use a max of 3 slots.Any help would be great! I realy dont want to have to replace a third motherboard and go though all the hassle. And i dont think it would solve the problem either...Things i have tried (in no specific order): Testing each DIMM individually (All work correctly) Testing all DIMM Slots on the motherboard individually (All work correctly so long as i dont use all 4 at the same time!) Re-seating the CPU cooler 4) replacing the motherboardI had the same issue on both of my Asus strix Z390-F Mobos and on my Asus strix Z390-E (The one i currently have)5) Clearing CMOS6) (RECOMMENDEDMY ASUS SUPPORT) -> go into the BIOS > Advanced Menu > APM Configuration, from here set the ERP Ready to Enabled S4 + S5 or Enabled S5 and set the Restore AC Power Loss to Last State and test the motherboard again.7) Enabling XMP8) Updating BIOS9) Using 2 x hyper-X sticks and 2 x G.Skill sticks (Same issue)Specs:I9 9900kAsus strix Z390-E32GB DDR4 G.SKILL Trident Z (2 sets of 2 x 8GB DIMMS) - F4-2400C15D-16GTZRGTX 1080TI (x 2 )NZXT Kraken x521000W PSUSamsung 1TB 970 Evo Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/ Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 is the top right portion of the board blocked or anything? CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1 Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync Desktop benching: Cinebench R15 Single thread:168 Multi-thread: 833 SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852600 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 (edited) Author 6 minutes ago, Jurrunio said: is the top right portion of the board blocked or anything? Not sure what you mean? The motherboard is physically fine. No defective pins from looking at it. I have also replaced the board multiple times. Edited August 30, 2019 by RonanEllis Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852609 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 5 minutes ago, RonanEllis said: Not sure what you mean? The motherboard is physically fine. No defective pins from looking at it. I have also replaced the board multiple times. just make sure the top half of the board gets some airflow. It could be a memory controller problem, and that's inside the CPU. CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1 Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync Desktop benching: Cinebench R15 Single thread:168 Multi-thread: 833 SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852620 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 Author 4 minutes ago, Jurrunio said: just make sure the top half of the board gets some airflow. It could be a memory controller problem, and that's inside the CPU. Ah right, Big case, lots of fans, there's plenty of ventilation. Temperatures are good. It will boot with 3 DIMMS in but wont even post with 4 - yet all the slots work when tested individually same with ram when tested individually. Mobo just freaks out when i use all 4 slots... Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852627 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 13 minutes ago, RonanEllis said: Ah right, Big case, lots of fans, there's plenty of ventilation. Temperatures are good. It will boot with 3 DIMMS in but wont even post with 4 - yet all the slots work when tested individually same with ram when tested individually. Mobo just freaks out when i use all 4 slots... memory controller problem could arise due to memory capacity. I guess you could try 4 4GB dimms... CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1 Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync Desktop benching: Cinebench R15 Single thread:168 Multi-thread: 833 SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852649 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 I had this sort of thing happen with Sandy Bridge and Gigabyte motherboards. It happened when I upgraded to 16gbs from 8gbs dual channel. I had 3 motherboards and 2 where P67 and one was a Z77. Only the Z77 would take 4 modules. I ended up buying new ram to make 16 for the rest. Don't fight it. There is probably a flaw in the board design that shows up with your ram. Get different ram or get another make board. I would get new ram. RIG#1 CPU: AMD, R 7 5800x3D| Motherboard: X570 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 3200 | GPU: EVGA FTW3 ULTRA RTX 3090 ti | PSU: EVGA 1000 G+ | Case: Lian Li O11 Dynamic | Cooler: EK 360mm AIO | SSD#1: Corsair MP600 1TB | SSD#2: Crucial MX500 2.5" 2TB | Monitor: ASUS ROG Swift PG42UQ RIG#2 CPU: Intel i9 11900k | Motherboard: Z590 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 3600 | GPU: EVGA FTW3 ULTRA RTX 3090 ti | PSU: EVGA 1300 G+ | Case: Lian Li O11 Dynamic EVO | Cooler: Noctua NH-D15 | SSD#1: SSD#1: Corsair MP600 1TB | SSD#2: Crucial MX300 2.5" 1TB | Monitor: LG 55" 4k C1 OLED TV RIG#3 CPU: Intel i9 10900kf | Motherboard: Z490 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 4000 | GPU: MSI Gaming X Trio 3090 | PSU: EVGA 1000 G+ | Case: Lian Li O11 Dynamic | Cooler: EK 360mm AIO | SSD#1: Crucial P1 1TB | SSD#2: Crucial MX500 2.5" 1TB | Monitor: LG 55" 4k B9 OLED TV RIG#4 CPU: Intel i9 13900k | Motherboard: AORUS Z790 Master | RAM: Corsair Dominator RGB 32GB DDR5 6200 | GPU: Zotac Amp Extreme 4090 | PSU: EVGA 1000 G+ | Case: Streacom BC1.1S | Cooler: EK 360mm AIO | SSD: Corsair MP600 1TB | SSD#2: Crucial MX500 2.5" 1TB | Monitor: LG 55" 4k B9 OLED TV Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852654 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 Change that from default 100% to a higher value Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852659 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 Author 1 hour ago, WereCat said: Change that from default 100% to a higher value Just attempted this - unfortunately made no difference Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852867 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 Author 1 hour ago, jones177 said: I had this sort of thing happen with Sandy Bridge and Gigabyte motherboards. It happened when I upgraded to 16gbs from 8gbs dual channel. I had 3 motherboards and 2 where P67 and one was a Z77. Only the Z77 would take 4 modules. I ended up buying new ram to make 16 for the rest. Don't fight it. There is probably a flaw in the board design that shows up with your ram. Get different ram or get another make board. I would get new ram. Yes looks like i might have to. For me though its probably best i change the motherboard as I can still return it. Might try a Gigabyte mobo this time round. Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12852975 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted August 30, 2019 2 hours ago, RonanEllis said: Yes looks like i might have to. For me though its probably best i change the motherboard as I can still return it. Might try a Gigabyte mobo this time round. Good luck. RIG#1 CPU: AMD, R 7 5800x3D| Motherboard: X570 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 3200 | GPU: EVGA FTW3 ULTRA RTX 3090 ti | PSU: EVGA 1000 G+ | Case: Lian Li O11 Dynamic | Cooler: EK 360mm AIO | SSD#1: Corsair MP600 1TB | SSD#2: Crucial MX500 2.5" 2TB | Monitor: ASUS ROG Swift PG42UQ RIG#2 CPU: Intel i9 11900k | Motherboard: Z590 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 3600 | GPU: EVGA FTW3 ULTRA RTX 3090 ti | PSU: EVGA 1300 G+ | Case: Lian Li O11 Dynamic EVO | Cooler: Noctua NH-D15 | SSD#1: SSD#1: Corsair MP600 1TB | SSD#2: Crucial MX300 2.5" 1TB | Monitor: LG 55" 4k C1 OLED TV RIG#3 CPU: Intel i9 10900kf | Motherboard: Z490 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 4000 | GPU: MSI Gaming X Trio 3090 | PSU: EVGA 1000 G+ | Case: Lian Li O11 Dynamic | Cooler: EK 360mm AIO | SSD#1: Crucial P1 1TB | SSD#2: Crucial MX500 2.5" 1TB | Monitor: LG 55" 4k B9 OLED TV RIG#4 CPU: Intel i9 13900k | Motherboard: AORUS Z790 Master | RAM: Corsair Dominator RGB 32GB DDR5 6200 | GPU: Zotac Amp Extreme 4090 | PSU: EVGA 1000 G+ | Case: Streacom BC1.1S | Cooler: EK 360mm AIO | SSD: Corsair MP600 1TB | SSD#2: Crucial MX500 2.5" 1TB | Monitor: LG 55" 4k B9 OLED TV Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-12853421 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted January 5, 2021 I had exactly the same problem with an Asus Prime z390a. Only difference is I had Corsair Vengeance RGB. Could get 3 dimms to work but 4 would not post. Finally returned the motherboard for a Gigabyte z390 and all is well. I suspect more people will start to see this when they attempt to increase in ram. Link to comment https://linustechtips.com/topic/1099558-cant-use-all-4-mobo-dimm-slots-at-same-time-but-all-slots-work-and-all-ram-works/#findComment-14363465 Share on other sites More sharing options... Link to post Share on other sites More sharing options...
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