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Question - 9900K + XI GENE @ 5G vcore

lowdog
Level 7
HI,

So I set up my 9900K as follows;

BIOS
XMP II = 3600MHz (2x16GB G-skill)
Asus Multicore Enhancement = Auto
CPU sync all cores = 50
SVID Behavior = Best case scenario
All power limits set to max
AVX Offset - 2
Cache Ratio = Auto
IA AC and IA DC = .01
LLC = 5
CPU Core/Cache Voltage = Adaptive Mode
Additional Turbo Mode voltage = 1.290
Offset + Offset Voltage = .01
Dram Volts = 1.35
VCCIO = 1.05v
VCCSA = 1.075

Now this has all been stable under Asus real Bench, Intel Extreme Tuning Utility and Prime95 26.6 custom 12/12 and here is the question???

In HWiNFO64 VID is reading 1.295 and vcore is reading 1.279v idle with windows power plan set to performance....now when I load up Prime 26.6 with custom 12/12 the vcore is reading 1.163v and cpu-z is reading the same 1.163v under load....HOW IS THIS POSSIBLE????? Am I missing something here????? Surely the vcore can't be that low under load.

Also when testing with Prime I initially had VRM heatsink passive and temps hit 75C so I wacked a small fan on the vrm area and temps dropped to 58C so pays when stress testing to have that fan on the VRM.

VRM passive when gaming never go over 45/50C so passive is fine for gaming.


78180
2,314 Views
4 REPLIES 4

lowdog
Level 7
No one has any insight into why the vcore is reporting so low! Really? Or is it in actual fact the real vcore that is being reported when under load? 🙂

x-rated
Level 8
low vcore is because of LLC 5 (vdroop) and your big avx offset (cpu doesnt need to much voltage at 4,8 GHz) 🙂
with old prime95 you test without avx so you have low temperatures and you need much less voltage

Falkentyne
Level 12
lowdog wrote:
HI,

So I set up my 9900K as follows;

BIOS
XMP II = 3600MHz (2x16GB G-skill)
Asus Multicore Enhancement = Auto
CPU sync all cores = 50
SVID Behavior = Best case scenario
All power limits set to max
AVX Offset - 2
Cache Ratio = Auto
IA AC and IA DC = .01
LLC = 5
CPU Core/Cache Voltage = Adaptive Mode
Additional Turbo Mode voltage = 1.290
Offset + Offset Voltage = .01
Dram Volts = 1.35
VCCIO = 1.05v
VCCSA = 1.075

Now this has all been stable under Asus real Bench, Intel Extreme Tuning Utility and Prime95 26.6 custom 12/12 and here is the question???

In HWiNFO64 VID is reading 1.295 and vcore is reading 1.279v idle with windows power plan set to performance....now when I load up Prime 26.6 with custom 12/12 the vcore is reading 1.163v and cpu-z is reading the same 1.163v under load....HOW IS THIS POSSIBLE????? Am I missing something here????? Surely the vcore can't be that low under load.

Also when testing with Prime I initially had VRM heatsink passive and temps hit 75C so I wacked a small fan on the vrm area and temps dropped to 58C so pays when stress testing to have that fan on the VRM.

VRM passive when gaming never go over 45/50C so passive is fine for gaming.


78180


Perfectly normal and expected. If you don't believe me, try LLC8.

Once you see a flat 1.279v idle and load, then try LLC7 and 6. Pick the one that is best, although LLC8 is not recommended because some vdroop is good. You can try 7 after testing.

Phillyflyer
Level 10
lowdog wrote:
HI,

So I set up my 9900K as follows;

BIOS
XMP II = 3600MHz (2x16GB G-skill)
Asus Multicore Enhancement = Auto
CPU sync all cores = 50
SVID Behavior = Best case scenario
All power limits set to max
AVX Offset - 2
Cache Ratio = Auto
IA AC and IA DC = .01
LLC = 5
CPU Core/Cache Voltage = Adaptive Mode
Additional Turbo Mode voltage = 1.290
Offset + Offset Voltage = .01
Dram Volts = 1.35
VCCIO = 1.05v
VCCSA = 1.075

Now this has all been stable under Asus real Bench, Intel Extreme Tuning Utility and Prime95 26.6 custom 12/12 and here is the question???

In HWiNFO64 VID is reading 1.295 and vcore is reading 1.279v idle with windows power plan set to performance....now when I load up Prime 26.6 with custom 12/12 the vcore is reading 1.163v and cpu-z is reading the same 1.163v under load....HOW IS THIS POSSIBLE????? Am I missing something here????? Surely the vcore can't be that low under load.

Also when testing with Prime I initially had VRM heatsink passive and temps hit 75C so I wacked a small fan on the vrm area and temps dropped to 58C so pays when stress testing to have that fan on the VRM.

VRM passive when gaming never go over 45/50C so passive is fine for gaming.


78180

Replicated your settings with a few minor changes:
Asus ROG Maximus XI Extreme
BIOS 802 (Beta)
Ambient Temp 21C
XMP II = 3866 MHz (4x8GB G-skill Trident Z RGB)
Asus Multicore Enhancement = Disabled
CPU sync all cores = 50
SVID Behavior = Best case scenario
All power limits set to max
AVX Offset = 0
Cache Ratio = Auto
IA AC and IA DC = .01
LLC = 5
CPU Core/Cache Voltage = Adaptive Mode
Additional Turbo Mode voltage = 1.25
Offset + Offset Voltage = 0
Dram Volts = 1.35
VCCIO = 1.05v
VCCSA = 1.075v

Prime 95 Version 26.6 (No AVX 3-5 Hrs)
No fan cooling VRM
Results in screenshot:
Asus ROG Maximus XI EXTREME
Intel i7 9900K OC'D @ 5.2 GHZ @ 1.345V (1.296V LOAD) LLC 6 PRIME 95 STABLE 8 HRS
XSPC RX360 Rad (6)Scythe Gentle Typhoon 1850 RPM Fans In Push/Pull @ 1500 RPMS
Swiftech Drive II / Swiftech MCP35X Pump
Enermax Platimax 1200 Watt Power Supply
32GB G.Skill F4-3866C18Q-32GTZR 3866 MHZ CL18 1.35V (OC 4266MHZ 17-18-18-41-2T @1.45V)
MSI GTX 1070 SEA HAWK EK X SLI WITH ASUS HB RGB
(5)Samsung 840 Pro 128 GB In Raid 0
(2) WD 1TB Black Edition
Corsair 900 D