Boot failure from CPU deadlock at 4.5GHz 5820K
Boot failure from CPU deadlock at 4.5GHz 5820K
maxwellmelon :
what bclk are you using? are you above 100? sometimes different bclk/cpu multipliers can affect overclock stability.
my bclk is 125. changing it to 100 isn't possible because the ram would drop to 2400mhz. my choices are xmp 2.0 which requires 125 bclk or auto which still keeps it at 125. manually setting it to 100 would force 2400mhz but for video purposes, higher ram speed is better than lower ram speed plus higher clock, so i keep it at 3000mhz with 125 bclk.
the multiplier is 35 =4.5 at 3000mhz with 125 bclk.
i've tried everything under 100 except changing voltages other than ram and vcore.
i'm quite skilled at overclocking, but this one is giving me trouble. the temps are great and the channel combinations i've experimented with from 4.375 to 4.5ghz definitely fall into advanced overclock territory, so i'm hesitant to go higher in voltage.
i use hwmonitor 1.31 and temperatures are stable. i have 7 fans total with liquid cooling, so i expect similar stability. i'm sure this is under-vented but going below 1.3v isn't ideal and seems risky. i've read that even stable overclocks at 1.3v vcore can still damage a cpu if everything checks out.
i want this to last more than 4 years.
what are you doing with cache/ring? leaving stock x30? set to auto. i can reach 4.5GHz OC (45/all core) with 3000MHz ram if i adjust bclk to 150 and ratio to 20. it just won't allow me to do this manually!!!! so stupid!!!!!!
CmdrJeffSinclair asks what is being done with cache/ring while leaving stock at 30%. It mentions setting to auto and achieving 4.5GHz OC with 3000MHz RAM by adjusting BCLK and ratio. The user expresses frustration about manual limitations and suggests higher multipliers for CPU and lower ring/cache settings for better performance.
CmdrJeffSinclair:
what are you doing with cache/ring? leaving stock x30? setting it to auto. I can reach 4.5GHz OC (45/All Core) with 3000MHz RAM if I set the BCLK to 150 and ratio to 20. It just won't allow me to do this manually!!!! So STUPID!!!!!!!!!
As an experiment, I set it to X30. The AUTO settings might be suggesting a high ring setting when I OC to X45, which then becomes the limit.
I've observed many tests (but none with 5820K) that indicate a higher CPU multiplier and a much lower ring/cache multiplier actually improve performance.
I tried everything already. I even kept the Cache at stock 3000MHz where the CPU multiplier was 35 and the Cache multiplier was 24, but I couldn't even post. That's when I began adjusting voltages, which only added more confusion since nothing worked.
However, with auto enabled, the ring is already at stock, so based on your notes, I think I'm already in optimal settings for CPU and cache. I believe my hesitation to change RAM from 3000MHz to 2444MHz was the key issue—since I've read that Haswell-E with the 5820K can have problems with heavy OC while RAM exceeds 2444/2666, my BIOS probably prevents manual BCLK changes without automatically lowering RAM speeds.
Since I started this to close the big speed gap between CPU and CPU ratio (4375/3000), I guess I'm still fine. Most recommend keeping ring within 300-500MHz of CPU ratio, but I can't do it. I still notice improvements. My memory speeds haven't dropped as shown in AIDA64 benchmarks, so maybe the trade-off isn't as important for my system.
What are your thoughts?
Most people suggest aiming for the ring within 300-500MHz of the CPU ratio. Check benchmark data to confirm this advice. This aligns with what I see in performance guides for OC'ing rings and cache, noting that overclocking the ring usually doesn't significantly impact stable clock speeds, and the effect is often minor.
Most people suggest getting the ring within 300-500MHz of the CPU ratio... Check the benchmark results that match this advice. This aligns with what I see for OC'ing ring/cache performance—they advise not to overdo it until you reach a stable CP clock, and even then the improvement is minimal: http://www.overclock.net/t/1411077/haswe...statistics Did I follow the steps in the wrong order and end up with a decent overclock? I shared my scores in AIDA64—Stock, OK, Good, or Great?
AIDA64 5820K @4375MHz
Dual DDR4-3000 16GB 14-16-16-34 CR2
Memory Read Speed: 42566 MB/s
Memory Write Speed: 23962 MB/s
Memory Copy Speed: 35463 MB/s
Memory Latency: 62.4ns
CPU Performance: 76916
CPU AES: 29792 MB/s
CPU Hash: 6712 MB/s
CPU ZLIB: 561.8 MB/s
CPU PHOTOWORXX: 18807 MPixel/s
I finally understood a few things.
I was able to reach my CPU Cache at 3500MHz and pass stress tests.
I discovered that my RAM at 3000MHz with a 5820K cannot adjust BCLK beyond 125, which is just a limitation that applies to all RAM and MOBOS models. Everyone I've met with a 5820K + 3000MHz RAM had to reduce it to either 2666 or 2444MHz to allow manual BCLK tuning for better CPU performance.
That's the situation.
I'm stable with:
CPU at 4375GHz @1.270v, vcore multiplier 35x, 125BCLK
CPU Cache at 3500MHz, voltages remain on auto
LLC set to lv3, but I might be fine at lv5 or lv1
RAM at 3000MHz with voltages 14-15-15-34, 2T @1.35v
I just wish my memory read/write/copy was more consistent compared to other overclockers.
AIDA64 shows me READ 44GB/s, WRITE 24GB/s, COPY 36GB/s, LATENCY 61.2ns.
This is the best I can achieve. I've lowered timings to 13-14-14-33 but failed Memtest86+ and don't want to tweak them further for a small gain in performance.
Please let me know if this is everything. I checked other 5820K benchmark results online, but they're hard to find. I'm planning to run 3DMark today to see how it performs.