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Voltages

post #1 of 2
Thread Starter 
I'm starting to get my Phenom (Rig 'Unnamed') to resonable good speeds on original air, but by accident I managed to get it up just a tad faster and running at quite substancially lower temperatures by changing something that was (is) refered as 'CPU/NB Voltage' in the 'BIOS'.

What is the different voltages, and what's their relation?

On my motherboard, I can set these voltages in 'BIOS':
Code:
Type                    Range           Stepping        Default
CPU Mode Voltage        MINV - MAXV     0.003125v       1.440v
CPU/NB Voltage          -0.635 - MAXV   0.003125v       1.500v
CPU VDDA Voltage        2.200 - 2.800   0.006250v       2.500v
DRAM Voltage            1.200 - 2.500   0.006250v       1.500v
NB Voltage              0.800 - 1.5125  0.006250v       1.100v
NB HT Voltage           0.800 - 1.5125  0.006250v       1.200v
NB 1.8V Voltage         1.800 - 2.800   0.005000v       1.800v
SB Voltage              1.100 - 1.800   0.005000v       1.100v
VDD PCIE                1.100 - 2.200   0.005000v       1.100v
VDDR                    1.200 - 1.800   0.005000v       1.200v

This made me run at 4GHz with a lot lower temperature just by lowering the 'CPU Mode Voltage' and increase the 'CPU/NB Voltage'! 61° is something I can live with (I have a beefier air cooler close by and I'll probably do water next months which will both lower the temps further than this).

PS. All degrees is in Celsius!
Code:
Mult    Core    Speed   Note            CPU;CPU/NB;DRAM;NB/HT;NB1.8;NB
17.5    228     3990    OK/74°          1.4250;1.15;1.5;1.2;1.8
17.5    228     3990    OK/72°          1.4125
17.5    228     3990    OK/71°          1.4000
17.5    228     3990    OK/70°          1.3875
17.5    228     3990    OK/68°          1.3750
17.5    228     3990    OK/67°          1.3625
17.5    228     3990    OK/CRASH        1.35625
17.5    228     3990    OK/CRASH (59°)  1.35625;1.1750
17.5    228     3990    OK/66°          1.35625;1.20000
17.5    228     3990    OK/CRASH        1.3500;1.15;1.5;1.2;1.8
17.5    228     3990    OK/61°          1.3500;1.2000

I'm currently trying the same trick with 226x18.0 but it isn't going very well, as one can see here:
Code:
Mult    Core    Speed   Note            CPU;CPU/NB;DRAM;NB/HT;NB1.8;NB
18.0    226     4068    OK/78°          1.4250;1.15;1.5;1.2;1.8
18.0    226     4068    OK/71°          1.4125
18.0    226     4068    OK/71°          1.4000
18.0    226     4068    OK/CRASH (69°)  1.39
18.0    226     4068    OK/CRASH        1.39
18.0    226     4068    OK/CRASH        1,3875;1,1750
18.0    226     4068    OK/CRASH        1,3875;1,20
18.0    226     4068    OK/CRASH        1,3875;1,2250;1,2250


So I managed to lower my CPU temp (not core temp) by quite a lot. I could possibly live with 69°, but if I could lower it further, by bumping the other voltages I'd be happy.

The ones I wonder most about is the four voltages that have something to do with the northbridge. What's the difference and how do they interact with each other? And what's VDDA and VDDR?

This is my first real hi-tech/gamer/OC motherboard and I'm quite stunned by everything that you can do and change with it!


PS. 'OK' means that it boots up and idles without problem. The 'CRASH' part means that it crashes during my three minute Prime95 stresstest. In some cases I managed to see how hot it was when it rebooted. Most of the times I never bothered to write it down.
Celia v3
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Black Edition ASUS SABERTOOTH 990FX ATI Mach64 Corsair 16GB DDR3 1600MHz (4x) 
Hard DriveHard DriveHard DriveCooling
OCZ Vertex Plus SATA II 60GB SSD INTEL SSDSA2CW08 Seagate Barracuda ST31500341AS Zalman CNPS 9700 LED 
OSMonitorPowerCase
Debian GNU/Linux Lenny Samsung SyncMaster 151S Antec VP350P + FSP Blue Storm II 500 CMS Stacker ATX/BTX 
OtherOther
HighPoint RocketRaid 2300 SAS/SATA Backplane 
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Celia v3
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Black Edition ASUS SABERTOOTH 990FX ATI Mach64 Corsair 16GB DDR3 1600MHz (4x) 
Hard DriveHard DriveHard DriveCooling
OCZ Vertex Plus SATA II 60GB SSD INTEL SSDSA2CW08 Seagate Barracuda ST31500341AS Zalman CNPS 9700 LED 
OSMonitorPowerCase
Debian GNU/Linux Lenny Samsung SyncMaster 151S Antec VP350P + FSP Blue Storm II 500 CMS Stacker ATX/BTX 
OtherOther
HighPoint RocketRaid 2300 SAS/SATA Backplane 
  hide details  
Reply
post #2 of 2
Thread Starter 
Quote:
Originally Posted by fransurbo View Post

I'm starting to get my Phenom (Rig 'Unnamed') to resonable good speeds on original air
I swapped coolers with my Athlon which I couldn't clock very high anyway (only got as far as 3.0 due to my crappy ECS motherboard).

I now have the Zalman CNPS9700 LED on the Phenom instead. Did a difference, but I still can't get it up to 4.2 stable. Not even 4.1! The best I've gotten is 4060MHz, but even on the Zalman it's running at 79ºC which is a little hot for continuous use.
Celia v3
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Black Edition ASUS SABERTOOTH 990FX ATI Mach64 Corsair 16GB DDR3 1600MHz (4x) 
Hard DriveHard DriveHard DriveCooling
OCZ Vertex Plus SATA II 60GB SSD INTEL SSDSA2CW08 Seagate Barracuda ST31500341AS Zalman CNPS 9700 LED 
OSMonitorPowerCase
Debian GNU/Linux Lenny Samsung SyncMaster 151S Antec VP350P + FSP Blue Storm II 500 CMS Stacker ATX/BTX 
OtherOther
HighPoint RocketRaid 2300 SAS/SATA Backplane 
  hide details  
Reply
Celia v3
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Black Edition ASUS SABERTOOTH 990FX ATI Mach64 Corsair 16GB DDR3 1600MHz (4x) 
Hard DriveHard DriveHard DriveCooling
OCZ Vertex Plus SATA II 60GB SSD INTEL SSDSA2CW08 Seagate Barracuda ST31500341AS Zalman CNPS 9700 LED 
OSMonitorPowerCase
Debian GNU/Linux Lenny Samsung SyncMaster 151S Antec VP350P + FSP Blue Storm II 500 CMS Stacker ATX/BTX 
OtherOther
HighPoint RocketRaid 2300 SAS/SATA Backplane 
  hide details  
Reply
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