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OC'ing with CPU/HT Ref Clock

post #1 of 7
Thread Starter 
I have an Athlon II X3 445 with a Biostar TA880GB+ motherboard (AMD 880G, SB710 chipset).

Right now I have a stable OC with the following -

CPU/HT Ref Clock: 262
CPU: 3.93GHz (262 x 15.0) @ 1.5V [ACC unlocked to Phenom II X4 B45, extra core defective but 6MB L3 works]
CPU/NB: 2620MHz @ 1.25V
HT Link: 2358MHz @ 1.20V
Memory: 2 x 2GB Mushkin DDR3-1333 @ 262 *8/3 = 698, DDR3-1397 9-9-9-24-33-1T @ 1.55V

I was going for a little higher CPU-NB and memory bandwidth, so I tried increasing Ref Clock to 270 and stepping down the CPU multiplier to x14.5 (CPU = 3915MHz). I also increased CPU/NB voltage to 1.32V and dropped HT multiplier to x8 for 2160 HT Link.

With those settings, IntelBurnTest v2.50 showed unstable results..I tried bumping up CPU/NB V to 1.4V but it was still unstable. Then I tried increasing RAM voltage to 1.61V, but that didn't work.

The only voltage I haven't touched is the NB (motherboard chipset) voltage. Its default is 1.20V. Does a higher Ref Clock affect the NB/chipset and do I need to increase this value?
Edited by GTRX7 - 1/15/11 at 6:02am
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon II X3 445 Biostar TA880GB+ Asus EAH5850 DirectCU TOP Mushkin Enhanced 2 x 2GB DDR3-1333 
Hard DriveOptical DriveOSMonitor
Seagate Barracuda 500GB 7200RPM SATAII Lite-On 24x DVD Writer SATA Windows 7 Ultimate x64 Dell E2210H 22" 1080P 
PowerCase
hec X-Power Pro 650W Cooler Master Elite 430 
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My System
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CPUMotherboardGraphicsRAM
AMD Athlon II X3 445 Biostar TA880GB+ Asus EAH5850 DirectCU TOP Mushkin Enhanced 2 x 2GB DDR3-1333 
Hard DriveOptical DriveOSMonitor
Seagate Barracuda 500GB 7200RPM SATAII Lite-On 24x DVD Writer SATA Windows 7 Ultimate x64 Dell E2210H 22" 1080P 
PowerCase
hec X-Power Pro 650W Cooler Master Elite 430 
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post #2 of 7
Since you dropped the nb multiplier, you dont need to increase the voltage. The instability is probably due to a very high ref clock.

on second thought, try using 2t instead of 1t for the ram and try out the benchmark again.
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by leopold1985 View Post
Since you dropped the nb multiplier, you dont need to increase the voltage. The instability is probably due to a very high ref clock.

on second thought, try using 2t instead of 1t for the ram and try out the benchmark again.
I didn't drop the CPU-NB multiplier. It's still at x10 and with the ref clock of 270 it went up from 2620 to 2700.

I meant upping the voltage for the motherboard NB. The 880G chipset. Not sure if it needs higher V to support a higher ref clock.

I'll try 2T command for my RAM and see what happens.

Thanks
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon II X3 445 Biostar TA880GB+ Asus EAH5850 DirectCU TOP Mushkin Enhanced 2 x 2GB DDR3-1333 
Hard DriveOptical DriveOSMonitor
Seagate Barracuda 500GB 7200RPM SATAII Lite-On 24x DVD Writer SATA Windows 7 Ultimate x64 Dell E2210H 22" 1080P 
PowerCase
hec X-Power Pro 650W Cooler Master Elite 430 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon II X3 445 Biostar TA880GB+ Asus EAH5850 DirectCU TOP Mushkin Enhanced 2 x 2GB DDR3-1333 
Hard DriveOptical DriveOSMonitor
Seagate Barracuda 500GB 7200RPM SATAII Lite-On 24x DVD Writer SATA Windows 7 Ultimate x64 Dell E2210H 22" 1080P 
PowerCase
hec X-Power Pro 650W Cooler Master Elite 430 
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post #4 of 7
It should help, I'm only at 1.42V @ 4.0GHz Stable with a 1055T
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post #5 of 7
Might be RAM holding you back those few Mhz on the ref clock there; they're generic.
post #6 of 7
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
Might be RAM holding you back those few Mhz on the ref clock there; they're generic.
Hmm. Can IBT bring out errors in RAM that Memtest doesn't detect? My RAM was able to pass Memtest at DDR3-1440 speed and 9-9-9-24-33-1T
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon II X3 445 Biostar TA880GB+ Asus EAH5850 DirectCU TOP Mushkin Enhanced 2 x 2GB DDR3-1333 
Hard DriveOptical DriveOSMonitor
Seagate Barracuda 500GB 7200RPM SATAII Lite-On 24x DVD Writer SATA Windows 7 Ultimate x64 Dell E2210H 22" 1080P 
PowerCase
hec X-Power Pro 650W Cooler Master Elite 430 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon II X3 445 Biostar TA880GB+ Asus EAH5850 DirectCU TOP Mushkin Enhanced 2 x 2GB DDR3-1333 
Hard DriveOptical DriveOSMonitor
Seagate Barracuda 500GB 7200RPM SATAII Lite-On 24x DVD Writer SATA Windows 7 Ultimate x64 Dell E2210H 22" 1080P 
PowerCase
hec X-Power Pro 650W Cooler Master Elite 430 
  hide details  
Reply
post #7 of 7
Use HyperPi at 32M setting to stability test within the OS. Memtest stability results often differ from OS stability.
I would also hold out on overclocking that much (i.e. pushing 1.5V) if I were you. The x3 445 is a 95W TDP processor, unlocking both the L3 and extra core turns it into a Phenom II a.k.a. 125W monster. Your board has a 3+1 power phase, actually less than acceptable for many 125W processor. Pushing 1.5V would be very risky, I would bring it down to stock or opt for a lesser voltage overclock. You're also using a tower cooler which brings no air to the VRMs/power phase/mosfets, and no extra mosfet heatsinks, which additionally adds to the risk. What's at stake? Your entire system. One flaming motherboard could take out your CPU, memory and possibly anything else connected to it. And yes, weak power phases have caused problems on such chips before. Don't make me mention all those MSI horror stories...
Edited by xd_1771 - 1/15/11 at 6:46pm
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