Overclock.net › Forums › AMD › AMD Motherboards › ROG Crosshair VI overclocking thread
New Posts  All Forums:Forum Nav:

ROG Crosshair VI overclocking thread - Page 1185

post #11841 of 16852
Ouch
post #11842 of 16852
Just resign to the timings of 18-16-16-38. May update is just around the corner. We shall see if that aids our lesser kits in reaching the rated timings.
post #11843 of 16852
I'll give it a shot
post #11844 of 16852
Quote:
Originally Posted by kaseki View Post




There are two issues here related to liquid cooling. The first is the damage that can occur if it leaks, which depends on the user's case location. This is sufficiently obvious that it need not be addressed in detail.

The second issue is that thermodynamics limits what non-refrigerated coolant can do. In steady state for a given CPU power level, the heat being removed from the CPU is the same with air and with coolant. In order for a liquid-cooled CPU to be slightly cooler, the heat exchanger and fans have to be more efficient transferring heat to air than the air system at the CPU is. To be more efficient requires the liquid-to-air thermal resistance be significantly lower than for the heat pipe vapor to air thermal resistance at the air cooler over the CPU. This generally requires the liquid cooler to have more fin area and more air flow velocity at the heat exchanger; something easier done away from the CPU.

Note that for the CPU to be cooler, the liquid has to be cooler, and the heat transfer to the fins at the heat exchanger will be thereby reduced, everything else being equal. Fortunately for the successful comparison of the liquid system to the air system, the heat pipe schemes in air coolers are less effective at transferring heat to the fins than radiator-style heat exchangers are in liquid-cooled systems. Thermodynamics is thus the reason for the very modest increase in temperatures shown by the large Noctua units in the chart.

Laws of thermodynamics, simplified: You can't win; you can't break even; you can't get out of the game.

I don't believe in a no win scenario. wink.gif
Destroyer
(13 items)
 
  
Reply
Destroyer
(13 items)
 
  
Reply
post #11845 of 16852
Quote:
Originally Posted by Reikoji View Post

Have you tried going back to using a setup P0 in bios and using Zenstates along with?

I don't know if Zenstates is doing a good job (or designed to do) of activating selected Pstates when Pstates aren't already activated and you weren't using them before using zenstates. That would be an Elmor question.

Still no luck, unfortunately. I took it all the way back to optimized defaults and went one step at a time in the bios just to get my Pstates set up, but my Vcore still refuses to drop, with or without ZenStates. Not that 1.387v is necessarily too much, but I'd love to see it at .9v when idling.
post #11846 of 16852
Quote:
Originally Posted by Inkey View Post

Still no luck, unfortunately. I took it all the way back to optimized defaults and went one step at a time in the bios just to get my Pstates set up, but my Vcore still refuses to drop, with or without ZenStates. Not that 1.387v is necessarily too much, but I'd love to see it at .9v when idling.

It's easy to miss something. You could try posting your EUFI screenshots, these guys are good at spotting things.
post #11847 of 16852
Quote:
Originally Posted by Reikoji View Post

Just resign to the timings of 18-16-16-38. May update is just around the corner. We shall see if that aids our lesser kits in reaching the rated timings.

3600 here I come thumb.gif
post #11848 of 16852
Good luck
post #11849 of 16852
I'm so flipping happy I could finally hit at least 3200mhz with good timings, here's hoping I can get 3600mhz to work with the next bios update though. thumb.gif

Thanks to all for their advice and help. thumb.gif
post #11850 of 16852
Posting my results:

First the hardware:

  • Ryzen 1800X
  • CH6 running the 1002 Bios
  • Noctua NH-U12S SE-AM4 cooler
  • 4x8 G.Skill Flare X 3200 memory, 32 GB
  • Seasonic 650W Prime Platinum power supply
  • Samsung 960 Pro m.2 1TB SSD
  • Sapphire Nitro RX 580 (waiting on Vega...)



This is around my 15th computer, easiest build ever. Most of my problems are to the CH6's BIOS configuration being a little less than friendly. (multiplier and divider math for clock speed really?, no way to pull load an SPD profile into settings so you are left to key it all in manually etc.)

I am currently stuck at 4Ghz. 4.2 boots and 4.1 is stable until loaded with something like Intel Burn Test or Prime95, so I still have some faith 4.1ish is possible with some more time to tweak. I am not a fan of touching the BCLK so did everything but mess with that, or delve into the 'Tweakers Paradise' settings. The motherboard left to do things the 'auto' way seems to kick up the voltage of everything way too much. Get the major voltage settings set to manual ASAP, as the board will easily automatically kick the voltages of everything to rather high levels with even moderate overclocking.

  • Setting the DRAM voltage and boot voltage to 1.3 yields a 1.35 voltage in practice
  • The RAM worked at 2666 with the SPD's timings 14-14-14-34
  • It took a while to discover this, but the RAM works at 2933 and 3200 but timings must be relaxed to 18-18-18-38.
  • With my settings, voltages displayed in windows when the system is under load are: CPU 1.373v, SOC 1.113v, DRAM 1.351v, VDDP 0.959v, 1.8 PPL 1.940v
  • CPU temp shows as 81C under sustained load, should be off by +20C due to being an X model and the wonky temp reporting

My settings deviating from the 1002 defaults:
  • AI Overclock Tuner: Manual
  • FID: 200
  • DID: 10
  • Performance Bias: None
  • Memory Frequency: DDR4-3200 MHz
  • Core Performance Boost: Disabled
  • CPU Core Voltage: Manual, 1.375
  • CPU SOC Voltage: Manual, 1.1
  • DRAM Voltage: Manual, 1.3
  • DRAM Timing Control -> DRAM CAS# Latency : 18
  • DRAM Timing Control -> DRAM RAS# to CAS# Read Delay : 18
  • DRAM Timing Control -> DRAM RAS# to CAS# Write Delay : 18
  • DRAM Timing Control -> DRAM RAS# PRE Time : 18
  • DRAM Timing Control -> DRAM RAS# ACT Time : 38
  • External Digi+ Power Control -> CPU Load-line Calibration : Level 2
  • External Digi+ Power Control -> VRM Switching Frequency : Manual, 500
  • External Digi+ Power Control -> CPU Power Phase Control: Extreme
  • External Digi+ Power Control -> DRAM Power Phase Control: Extreme
  • External Digi+ Power Control -> DRAM VBoot Voltage: 1.3
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD Motherboards
Overclock.net › Forums › AMD › AMD Motherboards › ROG Crosshair VI overclocking thread