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ROG Crosshair VI overclocking thread - Page 849

post #8481 of 17593
Quote:
Originally Posted by SpecChum View Post

Well, guess who's just swapped his 1700 out for another and can now boot (and reboot) first time at 3200 14-14-14-34 now smile.gif

Wow lol. I got my 1800x for 300 bucks after some slickdealing and I paid the full price for the other. Hate to have to get another for 3200 lol wink.gif
post #8482 of 17593
@specchum

At stock, when you load CPU with x264 stability test what is VCORE on ProbeIt? wink.gif .

Just wanna know difference between mine (~1.119V), I need +162mV for 3.8GHz. What's ya SOC? mine default is ~0.893V on DMM ProbeIt, I use 0.962V in UEFI for 3.8GHz/3200MHz C14 1T.

Without CB performance bias and no change to priority, etc of CB I get 1701 on UEFI 0079 Win 7 Pro x64.





The 1744 result is UEFI 1002 with CB PB, but view how AIDA64 differs on RAM for me on 0079.

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post #8483 of 17593
Quote:
Originally Posted by Raja@ASUS View Post

No, havent taken any more - didn't see much reason to. Perhaps tomorrow if I feel up to it...heh

That's the res of the captures, less whatever compression the forum imposes at max size - they are more than legible if you can read the forum text. biggrin.gif

I think looking at the peaks of a LLC5 when the load goes down might scare people away from using it. Was planning on taking a look myself, but hooking my oscilloscope to the back of the socket is going to be messy...
    
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post #8484 of 17593
Quote:
Originally Posted by nycgtr View Post

Wow lol. I got my 1800x for 300 bucks after some slickdealing and I paid the full price for the other. Hate to have to get another for 3200 lol wink.gif

I've actually got 3 1700's here biggrin.gif
post #8485 of 17593
Quote:
Originally Posted by gupsterg View Post

@specchum

At stock, when you load CPU with x264 stability test what is VCORE on ProbeIt? wink.gif .

Just wanna know difference between mine (~1.119V), I need +162mV for 3.8GHz. What's ya SOC? mine default is ~0.893V on DMM ProbeIt, I use 0.962V in UEFI for 3.8GHz/3200MHz C14 1T.

Without CB performance bias and no change to priority, etc of CB I get 1701 on UEFI 0079 Win 7 Pro x64.





The 1744 result is UEFI 1002 with CB PB, but view how AIDA64 differs on RAM for me on 0079.


I have no idea where my DMM is frown.gif
post #8486 of 17593
Quote:
Originally Posted by geoxile View Post

So basically RAM is one big crap shoot... Great.

On another note, anyone else notice really high voltage in BIOS? I get 1.35V when just looking through BIOS, and if I set an offset it goes even higher. I tried resetting to optimal default settings, but should I try clearing the CMOS battery?

Not really a board limitation from what I have observed. So I guess this is a good time to introduce my theory about memory clocks. I have two CH6's, two 1800x, and one 1700 that belong to a buddy of mine. We have 4 ram kits, all G.skill, 1ea 2x8 3200 Cas 14, 2ea 2x8 3600 Cas 16, and 1ea 2x8 4266 C19.


Here is my initial observation:

On both boards all 4 memory kits will run 3200 CL14 without any issues on both 1800x. On both boards, and all 4 memory kits, the 1700 struggles to hit over 2933 without some serious SOC and DRAM voltage increases.. So 4 memory kits, 2 motherboards, the memory results are the same for each CPU no matter how you mix and match them.

So from our testing it appears the CPU is the deciding factor. Which after some thinking and reviewing of AMD's materials, started to make ALOT of sense to me. I am in the opinion that what we are seeing is limitations in the data fabric (or Infinity Fabric depending on who you ask). In talking to a few people I have also began to notice a correlation between max stable OC and memory speeds. It appears the CPU's that can hit 4.0ghz on lower Vcores also seem to be the CPU's that are able to hit higher memory speeds.

I think a big part of this architecture that no one has been talking about is that the data fabric runs at
DRAM clock (half DDR). This fabric is a series of interconnects traced onto the CPU die, and just like all traces on a die, some are cleaner than others. Contaminants, thickness, slight narrowing of the trace, etc. all impact how well electrons move down the trace, and as a result effect what the maximum frequency it can sustain.

Just like with CPU overclocking ability, this is a lottery. On cleaner CPU's we are seeing higher clock speeds, and on those cleaner dies the fabric is cleaner and is able to run at higher frequencies; where on the lower binned CPU's, those that are a little dirtier, the clocks are lower, and the fabric is unable to support higher memory clocks.

So I believe the lottery on Ryzen is not only for CPU clock, but for memory clock as well. We know (or at least strongly suspect) that the higher end CPU's get the better bins, which is why a much greater percentage of 1800x CPU's can hit 4.0Ghz at lower voltages than the 1700x or 1700's. If my theory is correct, it might also suggest that the lower end CPU's are going to struggle to hit the higher DRAM clocks as well.

I would love some feedback on what you guys think.
Edited by Gadfly - 4/11/17 at 12:42pm
post #8487 of 17593
Quote:
Originally Posted by MNMadman View Post




To go into more detail, it only happens when the system is fully loaded by a stress test, but is not limited to high RAM usage.

IBT causes the pauses on all settings. It happened even on the first pass on Standard.

IBT AVX Standard doesn't cause the pauses, probably because it's finishing too quickly.
IBT AVX High does cause the pauses.
IBT AVX Maximum does cause the pauses.
Haven't tried IBT AVX Very High but I assume it does cause the pauses.

RealBench Benchmark doesn't cause the pauses.
RealBench Stress Test does cause the pauses even on the 4GB setting. It usually happens within a minute or two.

AIDA64 causes the pauses with CPU/FPU/Cache/SystemMemory checked.
AIDA64 does not cause the pauses with just CPU/FPU/Cache checked.

The pauses don't happen in benchmarks or regular usage -- only on stress tests. The pauses don't cause the stress tests to fail.

Hopefully it is something simple like a driver.

i installed RS2 clean
but RealBench Stress Test does cause the pauses too
how can i fix this?
on RS1 it didn't happen
post #8488 of 17593
ProbeIt is useless on load.
post #8489 of 17593
Quote:
Originally Posted by SpecChum View Post

I have no idea where my DMM is frown.gif

OK, HWiNFO screenie @ CPU stock with x264 loading CPU?
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XPS - i5 4690K
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XPS - Q6600
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CPUMotherboardGraphicsRAM
Intel Q6600 G0 Asus P5K Premium Black Pearl Sapphire Toxic HD5850 Corsair Dominator 4GB 
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XPS - R7 1700
(14 items)
 
XPS - i5 4690K
(12 items)
 
XPS - Q6600
(8 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 Asus Crosshair VI Hero Sapphire Fury X@1145/545 G.Skill Trident Z 2x 8GB 3200MHz C14 
Hard DriveCoolingCoolingCooling
Samsung Evo 840 ThermalRight Archon IB-E X2 + 2x TY143 ThermalRight TY-143 2x front case intake Arctic Cooling F12 + 2x F9 as rear case exhaust 
OSMonitorKeyboardPower
Win 7 Pro x64 / Win 10 Pro x64 Asus MG279Q Cherry MX-Board 3.0 Cooler Master V850 
CaseMouse
SilverStone TJ06 Logitech G700S 
CPUMotherboardGraphicsRAM
i5 4690K@4.9GHz 1.255V Asus Maximus VII Ranger Sapphire Fury X@1145/545 HyperX Savage 2x8GB 2400MHz C11 
Hard DriveCoolingOSMonitor
Samsung Evo 840 TR Archon SB-E X2 Win 7 Pro x64 / Win 10 x64 Asus MG279Q 
KeyboardPowerCaseMouse
Cherry MX-Board 3.0 Cooler Master V850 SilverStone TJ06 Logitech G700S 
CPUMotherboardGraphicsRAM
Intel Q6600 G0 Asus P5K Premium Black Pearl Sapphire Toxic HD5850 Corsair Dominator 4GB 
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post #8490 of 17593
Quote:
Originally Posted by madweazl View Post

Not really an issue with the load of the CPU in BIOS.

Isn't it still bad to feed 1.6V to the CPU? Regardless of the load. The base voltage in BIOS is 1.3 to 1.35 but when running benchs I see 1.044V, so I need the offset to be +0.3V
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