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underclock X4 640 to X4 605e

post #1 of 10
Thread Starter 
basically I have this 640 in a small iTX case with little airflow.

What would I need to do in order to have it run at like 605e like speeds(from 3.0 to 2.3)?
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Um Stock....
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post #2 of 10
What would you need? Just lower the multiplyer and voltage
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Ex-wife's Rig
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2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
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Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by ronnin426850 View Post
What would you need? Just lower the multiplyer and voltage
i think the multi is locked?
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post #4 of 10
Quote:
Originally Posted by dlee7283 View Post
i think the multi is locked?
Lower the FSB.
(CPU Multi) * (FSB) = (CPU Freq)
Edit:
While you're at it, lower the voltage as well but not by too great amounts. When you reach your desired frequency, start lowering the voltage until it becomes unstable. Then, start incrementing it slowly slowly till it seems stable and run some stress tests. Then find the lowest stable voltage and use that.
Edited by MrAlex - 2/19/11 at 4:10am
    
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post #5 of 10
Quote:
Originally Posted by dlee7283 View Post
i think the multi is locked?
Can't be raised, can be lowered (i believe. Could be wrong, tho)
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Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
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Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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Ex-wife's Rig
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CPUMotherboardGraphicsRAM
Core i5 4460 AsRock H81M-DG4 Sapphire Rx470 Platinum KVR 1600 16Gb 
Hard DriveHard DriveCoolingOS
2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
MonitorKeyboardPowerCase
Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
MouseAudio
Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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post #6 of 10
Quote:
Originally Posted by dlee7283 View Post
i think the multi is locked?
You can still drop it, you just cant raise it above stock
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post #7 of 10
Quote:
Originally Posted by Fallen Angel -X View Post
You can still drop it, you just cant raise it above stock
Yes, this
Just remember to drop the volts, will get you an EE CPU with no cost of performance, my AthII is OCd and undervolted, stable, fast and energy efficient
Edited by ronnin426850 - 2/19/11 at 4:13am
My Rig
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Ex-wife's Rig
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CPUMotherboardGraphicsRAM
Core i5 4460 AsRock H81M-DG4 Sapphire Rx470 Platinum KVR 1600 16Gb 
Hard DriveHard DriveCoolingOS
2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
MonitorKeyboardPowerCase
Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
MouseAudio
Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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My Rig
(14 items)
 
Ex-wife's Rig
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 4460 AsRock H81M-DG4 Sapphire Rx470 Platinum KVR 1600 16Gb 
Hard DriveHard DriveCoolingOS
2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
MonitorKeyboardPowerCase
Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
MouseAudio
Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
OSMonitorKeyboardPower
Windows 7 Pro x64 Toshiba 32" FullHD TV Logitech FSP Hexa 550 
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post #8 of 10
That's exactly what I do with my laptop. Using rightmark I've undervolted and lowered the max multi to 9x (at stock it's 10x). I've seen some extra battery life out of my lappy due to the lower energy requirements which isn't bad but it also doesn't need to run the fan as much (battery drainer) since it's running cooler due to the undervolting.

If you're running a desktop though it's best to do it in the BIOS since you actually can play with values in the BIOS since it's unlocked.

As for how you go about doing that. Keep your CPU at stock, no need to take a performance hit when you don't need to. Next just lower your voltages until it's unstable and then raise a little bit and stress test.
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post #9 of 10
Try K10Stat to find the lowest voltage for every P-state speed. It runs in Windows so you'll save time. Simply lower Vcore a step at a time then test stability until you hit the voltage bottom. If stock speed is still too hot, drop the multiplier to get lower voltage.
Works even without CnQ enabled. A must-have tool.
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Heckling Hestia
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post #10 of 10
You can undervolt at the stock 3Ghz speed as well
If you can find a Phenom II stock cooler (heatpipes), use that also.
A Phenom II heatpipes cooler is how I keep an Athlon II x4 630 cool in an mATX small form factor rig without any side panel grilles/holes above the CPU fan area
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