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G.Skill Ripjaws X F3-17000C11Q-16GBXL Timing / Voltage Question. - Page 2

post #11 of 12
Alright! I see your problem. FX CPUs only require 2X DRAM bus speed for CPU-NB. Phenom II required 3X.

"In general the CPU NB clock should be at least two times the Memory clock
(example in case of DDR3-1600: 2 x 800MHz = 1600MHz NB clock)."

Page 12 - CPU NorthBridge Performance Tuning

http://sites.amd.com/us/Documents/AMD_FX_Performance_Tuning_Guide.pdf

So that explains why your CPU-NB Voltage was already so high... 2000MHz (default) or 2200MHz would be more than sufficient. This was a main improvement with the FX series CPUs, which is why they are able to handle higher DRAM frequency than the Phenom II series CPUs.

xxpenguinxx is using Phenom II 1090T, so his ideal CPU-NB Frequency is 2800MHz.

DDR3-1866: 3 x 933MHz = 2800MHz CPU-NB Frequency

For DDR3-2133, then you set to 2200MHz for CPU-NB Frequency.

Hope that solves your issues!

Happy Overclocking!

Cheers!
post #12 of 12
Thread Starter 
Quote:
Originally Posted by timisyourfriend View Post

Alright! I see your problem. FX CPUs only require 2X DRAM bus speed for CPU-NB. Phenom II required 3X.

"In general the CPU NB clock should be at least two times the Memory clock
(example in case of DDR3-1600: 2 x 800MHz = 1600MHz NB clock)."

Page 12 - CPU NorthBridge Performance Tuning

http://sites.amd.com/us/Documents/AMD_FX_Performance_Tuning_Guide.pdf

So that explains why your CPU-NB Voltage was already so high... 2000MHz (default) or 2200MHz would be more than sufficient. This was a main improvement with the FX series CPUs, which is why they are able to handle higher DRAM frequency than the Phenom II series CPUs.

xxpenguinxx is using Phenom II 1090T, so his ideal CPU-NB Frequency is 2800MHz.

DDR3-1866: 3 x 933MHz = 2800MHz CPU-NB Frequency

For DDR3-2133, then you set to 2200MHz for CPU-NB Frequency.

Hope that solves your issues!

Happy Overclocking!

Cheers!

This is exactly what I was looking for as a response to my earlier post:
Quote:
Originally Posted by ThisMaySting View Post

Sorry to double post, but I have discovered some things since my last post. Dropping my CPU-NB frequency from 2800 to 2400 dropped the CPU-NB Voltage (on Auto) significantly, down to about 1.2v.

Is there really an advantage to having the CPU-NB frequency THAT much higher (2800) than what one is looking to overclock their RAM to (1866 or 2133MHz)? If the IMC is drawing that much power because its frequency is at 2800, yet my RAM is only utilizing 1866/2133 MHz, isn't going anything higher than a 2200 or 2400 MHz CPU-NB Frequency just a waste and unnecessary over voltage?

I knew there was something funky in the chicken when the Auto Voltage of the CPU-NB was at 1.45v at the Frequency of 2800. Since Then I have reinstalled the 16 GB (4x4) of Ripjaws, upped the RAM voltage to 1.66, manually set the CPU-NB voltage to 1.33v and lowered the frequency to 2050 MHz. Performs like a dream!

Thank you once again to everyone for all the help, assistance in self research, and replies!

Many cheers!
Abacus
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EK-AF Ball Valve (10mm) G1/4 - Matte Black (x2) PrimoFlex Advanced LRT Tubing - 7/16in. ID X 5/... Monsoon Free Center Compression Fittings, 7/16"... Corsair Air Series SP120 Performance Edition Hi... 
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EK-FC970 GTX ACX Backplate - Black (x2) Windows 7 Ultimate Sanyo 40" 1080P TV G.Skill RIPJAWS KM780 MX RGB 
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Yamaha RX-V1800 7.1 Receiver Klipsch KG-4 Floor Standing (front) Klipsch KV-3 Center Channel Klipsch KSF 10.5 Floor Standing (rear) 
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Abacus
(29 items)
 
  
CPUMotherboardGraphicsRAM
Intel I7-5820K Gigabyte X99P SLI EVGA GeForce GTX 970 FTW GAMING ACX 2.0 G.SKILL Ripjaws 4 Series 
Hard DriveCoolingCoolingCooling
OCZ Vertex 4 256 EKWB Supremacy Evo CPU Block Bitspower G1/4 Matte Black Dual Rotary 60-Degre... Bitspower G1/4 Matte Black Dual Rotary 45-Degre... 
CoolingCoolingCoolingCooling
EK-AF Ball Valve (10mm) G1/4 - Matte Black (x2) PrimoFlex Advanced LRT Tubing - 7/16in. ID X 5/... Monsoon Free Center Compression Fittings, 7/16"... Corsair Air Series SP120 Performance Edition Hi... 
CoolingCoolingCoolingCooling
Aquacomputer Aqualis D5 150ml Reservoir Alphacool Nexxxos Monsta 240mm Radiator (x2) Alphacool Nexxxos Monsta 480mm Radiator EK-FC970 GTX ACX - Acetal+Nickel (x2) 
CoolingOSMonitorKeyboard
EK-FC970 GTX ACX Backplate - Black (x2) Windows 7 Ultimate Sanyo 40" 1080P TV G.Skill RIPJAWS KM780 MX RGB 
PowerCaseMouseMouse Pad
EVGA SuperNOVA 1000 PS (Platinum) Cooler Master CM Storm Trooper Razer Naga Chroma Razer Goliathus Control Large 
AudioAudioAudioAudio
Yamaha RX-V1800 7.1 Receiver Klipsch KG-4 Floor Standing (front) Klipsch KV-3 Center Channel Klipsch KSF 10.5 Floor Standing (rear) 
Other
Logisys True-Color CCFL Light Bar - 12" - White... 
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Overclock.net › Forums › Components › Memory › G.Skill Ripjaws X F3-17000C11Q-16GBXL Timing / Voltage Question.