Causes
- DDR5 memory training runs on every cold boot unlike DDR4, a DDR5 board negotiates the timing table and reference voltages with the modules at power-on. With the 6000 CL36 EXPO profile active, that negotiation on the FURY Beast kit takes 30 to 90 seconds on AM5 boards that do not cache a training result. Warm reboots skip it, which is why the first boot of the day feels broken and a restart two minutes later is instant.
- Memory Context Restore is disabled or was reset Memory Context Restore (MCR) saves the successful training result and reuses it, cutting POST to a few seconds. A CMOS clear, a BIOS flash, a DIMM reseat or a failed boot wipes that saved state, so the board falls back to full training. Some vendors also ship MCR disabled by default because caching a bad result can lock a machine into an unstable profile.
- The 6000 MT/s profile fails, so the board retries before falling back when EXPO cannot train at 6000, most boards attempt it two or three times, each attempt adding a full training cycle to the boot, and then come up at 4800 MT/s. A Tom's Hardware report of this exact FURY Beast 2 x 16 GB CL36 kit describes three restarts and a final boot at 4800 MHz when EXPO 6000 was set at 1.35 V, while the same kit booted immediately at 5600 MHz and 1.25 V.
- Modules sit in the wrong slot pair a 2 x 16 GB kit belongs in A2 and B2, the second and fourth slots from the CPU socket, which is the pair the board's trace layout is tuned for. Sticks in A1 and B1, or one stick in a three-DIMM layout, make training harder and slower, and often force a fallback to a lower speed after one or two retries.
- An old BIOS trains the kit slowly, or does not know it early AM5 firmware had conservative DDR5 training routines and long POST times that later AGESA releases cut down. A kit that is not on the board's memory QVL for the installed BIOS version can also train at a low speed and then retry on later boots, since the board keeps no valid saved result.
- Windows Fast Startup hides how slow the real POST is with Fast Startup enabled, "shutting down" actually hibernates, so the DDR5 training happens before Windows logs the boot and the delay shows up as a hang on the vendor logo rather than a slow Windows start. A cold boot after a full shutdown is the only reliable measurement.
How to Fix
- Check where the boot actually stops. Watch the board's debug LEDs during POST. DRAM lit with no display means the board is training or failing training, CPU lit means it never reached memory init, and VGA lit means memory passed and the display output is the problem. On boards without LEDs, the DRAM status LED near the DIMM slots does the same job. Time each state with a phone stopwatch so you know what you are fixing.
- Let the first boot after a CMOS clear finish. After a clear CMOS or BIOS flash, cold POST on this kit can take 60 to 120 seconds with the DRAM LED lit the whole time. Do not cut power or press reset during that window. Once it reaches Windows, shut down fully and time the next cold boot; a much shorter second boot proves training was the delay.
- Move the sticks to slots A2 and B2. Power down, unplug the PSU, and seat both modules in the second and fourth slots counting from the CPU. Push until both latches click; a half-seated DDR5 DIMM trains intermittently and adds retries. If you are running four DIMMs or a second kit, remove the extra pair and test with two modules only.
- Enable Memory Context Restore and Power Down Enable. In the BIOS memory or DRAM timing menu, set Memory Context Restore to Enabled and Power Down Enable to Enabled, then save and boot twice. The second boot should skip training and POST in a few seconds. If the machine then shows random bugchecks or drops from 6000 to 4800 MT/s, the cached result is bad: turn Memory Context Restore back off and fix stability first.
- Verify the speed did not silently drop. Open Task Manager > Performance > Memory or CPU-Z > Memory. A healthy 6000 MT/s kit shows DRAM Frequency near 3000 MHz. If it reads 2400 MHz, the board fell back to 4800 during training and your "long boot" is actually a slow failure. In that case work through the EXPO stability steps rather than the boot-time steps.
- Update the BIOS and check the memory QVL. Flash the latest stable BIOS with the vendor tool, then clear CMOS and load EXPO Profile 1 again. Confirm the kit's part number appears in the board's QVL list for that BIOS version. Kingston validates the FURY Beast 6000 CL36 kit on specific boards, and a board that is not validated often needs manual SoC voltage work before it trains cleanly.
- Disable Windows Fast Startup so you see the real cold boot. In Windows open Control Panel > Power Options > Choose what the power buttons do > Change settings that are currently unavailable and clear Turn on fast startup. Shut down completely and time the boot again. This separates a genuine POST delay from a hibernation resume problem.
- If the DRAM LED never clears, test one module. Power off, remove the stick in B2, and boot with a single module in A2. If it POSTs, swap in the other module alone. A stick that hangs the board at the DRAM stage in every slot is faulty and should go back to Kingston under the lifetime warranty. If both sticks boot alone but the pair hangs, the problem is the slot pair or the memory controller, so try the other channel pair and a lower speed before RMA.