DDR4 Memory issue with 5820k
DDR4 Memory issue with 5820k
Hello,
I've installed my i7 5820k on an Asus X99 Deluxe board at 4.3ghz and it's working well and stable.
Currently, my RAM (Corsair LPX 2800mhz) is running at 2133mhz, but when I enable the XMP profile and set it to 2800mhz, the system crashes in Aida within minutes.
Voltages and timings look correct.
I understand the XMP profile adjusts the CPU strap and BCLK frequency, so I've kept the RAM at stock speed to confirm stability.
However, if I slightly increase the memory speed above 2133mhz, the system becomes unstable.
Any suggestions or insights would be appreciated.
Thanks.
Hi,
I managed to reach 4.65 GHz on 2 cores and 4.5 GHz across all cores. My setup includes an ASUS x99 deluxe motherboard, a Corsair Vengeance LPX 3000 MHz with 15GB RAM (4x8GB), and a NZXT Kraken X61. I kept the RAM in XMP Auto mode, which adjusted the CPU strap to 125 MHz instead of 100 MHz, and fine-tuned the base clock slightly to optimize performance under load, aiming for a max temperature of 70°C. 2800 MHz felt somewhat unstable, but 2666 and 3000 MHz showed better stability (based on some research before the build). Consider using another XMP profile and reducing the CPU multiplier a bit to test AIDA64 again. It should work.
This is the manual I've been following.
Ram is operating at 2500mhz and appears to be stable.
I'm not sure what else to attempt...
Have you considered starting with your CPU at stock speed before activating XMP? I recommend accessing your BIOS, selecting the optimized default settings, enabling XMP at 2800Mhz, and checking for stability. It seems your CPU overclock at 4.3 might exceed the MCH capabilities, especially with the DRAM frequency already at 2800Mhz.
Just a reminder, the standard speed for all DDR4 chips, even with XMP settings, is 2133MHz. Going beyond that could make achieving a stable system more difficult.
CorsairJoseph asked about trying the CPU stock setting before enabling XMP. He suggests checking system stability by loading optimized defaults in BIOS, then activating XMP at 2800Mhz. He notes the CPU overclock at 4.3 might be too high for the MCH and DRAM speeds. He also mentions standard DDR4 speed is 2133MHz and anything above could be unstable.
Well if the system is already running smoothly at 4.3 Ghz with DRAM at 2500Mhz, I believe that would be a reasonable choice. It's a fairly stable configuration, and you probably won't see a big difference between 2800Mhz and 2500Mhz in practical use.
Additionally, it might be the CPU's preference for the "straps" that's the issue. For my 5820K model, I struggle to achieve stable POSTs during Cold Boot after applying OC and using 2800 or 3000 profiles. I can successfully run 3000 XMP at stock settings without any Overclocking. I haven't performed stress tests on standard CPU configurations, but I've found that 2666 with 100 straps and adjusted timings works best. My benchmark and bandwidth results are stronger at 2666 with manual tweaks compared to the 3000 XMP profile with regular settings.
CorsairJoseph shared his experience. He mentioned that with a stable system at 4.3 Ghz and DRAM at 2500Mhz, he feels confident about the settings. He also noted that a significant difference between 2800Mhz and 2500Mhz won't be noticeable in real-world use. Despite running Aida for seven hours without issues, he encountered a freezing problem in Windows after a restart, which displayed an "Overclocking failed" message.