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Underclock A CPU

post #1 of 4
Thread Starter 
Hi There

I have just finished building a HTPC with a i5 3570k cpu.

Now I know this processor is very much overkill, but I managed to buy it a second hand unused cheaper than the i3 I was planning on using.

From looking at the full list of Ivy Bridge i5 processors, the 3570k is rated at 77w, while there is a 3570t rated at 45w. The GHz difference goes from 3.4GHz on the 3570K to 2.3GHz on the 3570T.

I just wanted to know, if I could manually set in the BIOS the MAX multiplier as 23 on the 3570K and run it the same as the 3570T and have the benefit of the lower watts? I presume that I can reverse overclock the CPU to find the lowest stable voltage at the 23 multiplier setting?

If I just set the 23 multiplier, would the bios be able to auto control the volts or would it just ramp up to the normal volts required for the standard 3.4GHz?

Would there be anything else I could tweak in the BIOS to help reduce power usage?

I appreciate this is overclock.net, but as there is no underclock.net ( maybe missing a potential market here smile.gif ) I thought id post here.

Cheers

Tim
post #2 of 4
You have the general idea. Use CPU-Z to see what volts you get on a 23X with volts being on auto in Bios. If the volts don't automatically go don't to match the underclock, then you may choose to lower the volts manually and test the stability of the underclock using Prime95.
 
BitoHeaven
(16 items)
 
Cigar ATX PC
(14 items)
 
CPUMotherboardGraphicsGraphics
Intel i7 4770k @ 4.5GHz Asus Maximus VI Gene Gigabyte R9 290 @ 1160MHz/1350MHz Gigabyte R9 290 @ 1160MHz/1350MHz 
RAMHard DriveHard DriveOptical Drive
G.Skill Trident X 2X8GB DDR3 2400MHz Samsung 840 PRO 256GB  Seagate Barracuda 7200.14 3TB SATA III 6Gb/s 64... Pioneer Blu-ray Burner 
CoolingOSMonitorKeyboard
Liquid Single Loop Triple Radiators Win 7 SP1 Professional x64bit  Samsung SynchMaster 24" Widescreen 1200p TFT-LC... Logitech G15 
PowerCaseMouseMouse Pad
EVGA SuperNOVA G2 1300w 80+ Gold Fully Modular  Fractal Design Arc Midi R2 Microsoft Sidewinder X5 Allsop Redmond Mouse Pad 
Audio
Cambridge Soundworks 5.1 
CPUMotherboardGraphicsRAM
Intel Core i5-3570K @ 4.6GHz ASRock Z77E-ITX mITX  Sapphire HD 7990 @ 1090MHz/1600MHz G.SKILL Ripjaws 2X4GB DDR3-1600 @ 1866MHz 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD 128GB mSATA SATA III 6GB  Seagate Barracuda 7200.12 1TB SATA II 32MB 7200RPM LG DVD R/W SATA with LightScribe Corsair Cooling Hydro Series H100 
OSMonitorKeyboardPower
Win 7 Professional x64bit Samsung 52" 1080p 60Hz LCD Logitech Wireless K330 Corsair AX850 Gold Fully Modular 
CaseMouseMouse PadAudio
BitFenix Prodigy Mini-ATX Black  Logitech Wireless M215 Corsair Vengeance MM200 Yamaha RX-V681 & PSB/Polk Audio 5.1 
CPUMotherboardGraphicsRAM
AMD Athlon II X4 640 ASRock N68C-GS NVIDIA 6600GT G. Skill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 500GB 16MB Cache 7200RPM LG Optical Drive Thermaltake Max Orb Windows 7 
MonitorKeyboardPowerCase
Viewsonic 19” Flatscreen CRT Gigabyte GK-K6800 103  Thermaltake TR2 600W Cigar Boxes 
MouseMouse Pad
Zalman ZM-M300 Corsair Vengeance MM200 
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BitoHeaven
(16 items)
 
Cigar ATX PC
(14 items)
 
CPUMotherboardGraphicsGraphics
Intel i7 4770k @ 4.5GHz Asus Maximus VI Gene Gigabyte R9 290 @ 1160MHz/1350MHz Gigabyte R9 290 @ 1160MHz/1350MHz 
RAMHard DriveHard DriveOptical Drive
G.Skill Trident X 2X8GB DDR3 2400MHz Samsung 840 PRO 256GB  Seagate Barracuda 7200.14 3TB SATA III 6Gb/s 64... Pioneer Blu-ray Burner 
CoolingOSMonitorKeyboard
Liquid Single Loop Triple Radiators Win 7 SP1 Professional x64bit  Samsung SynchMaster 24" Widescreen 1200p TFT-LC... Logitech G15 
PowerCaseMouseMouse Pad
EVGA SuperNOVA G2 1300w 80+ Gold Fully Modular  Fractal Design Arc Midi R2 Microsoft Sidewinder X5 Allsop Redmond Mouse Pad 
Audio
Cambridge Soundworks 5.1 
CPUMotherboardGraphicsRAM
Intel Core i5-3570K @ 4.6GHz ASRock Z77E-ITX mITX  Sapphire HD 7990 @ 1090MHz/1600MHz G.SKILL Ripjaws 2X4GB DDR3-1600 @ 1866MHz 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD 128GB mSATA SATA III 6GB  Seagate Barracuda 7200.12 1TB SATA II 32MB 7200RPM LG DVD R/W SATA with LightScribe Corsair Cooling Hydro Series H100 
OSMonitorKeyboardPower
Win 7 Professional x64bit Samsung 52" 1080p 60Hz LCD Logitech Wireless K330 Corsair AX850 Gold Fully Modular 
CaseMouseMouse PadAudio
BitFenix Prodigy Mini-ATX Black  Logitech Wireless M215 Corsair Vengeance MM200 Yamaha RX-V681 & PSB/Polk Audio 5.1 
CPUMotherboardGraphicsRAM
AMD Athlon II X4 640 ASRock N68C-GS NVIDIA 6600GT G. Skill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 500GB 16MB Cache 7200RPM LG Optical Drive Thermaltake Max Orb Windows 7 
MonitorKeyboardPowerCase
Viewsonic 19” Flatscreen CRT Gigabyte GK-K6800 103  Thermaltake TR2 600W Cigar Boxes 
MouseMouse Pad
Zalman ZM-M300 Corsair Vengeance MM200 
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post #3 of 4
Thread Starter 
brilliant, I shall have a dabble and post back if I need any more advice!

thumb.gif
post #4 of 4
This isn't as uncommon on these boards as you might think. Same process as overclocking, just with reduced volts, instead of the opposite.
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Pre OCN build
(16 items)
 
  
CPUMotherboardGraphicsRAM
phenom ii B97 ECS A970M-A AM3+ EVGA GXT 460 2x4gb adata 
Hard DriveHard DriveHard DriveHard Drive
OCZ Vertex 4 Samsung F3 1TB Samsung f3 1tb Samsung HD155UI 
Optical DriveOSMonitorPower
Super Writemaster DVDr Windows 7 Samsung Syncmaster Antec Basiq power 550 + 
Case
Bitfenix Raider 
  hide details  
Reply
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