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Idiots Guide X4 II940

Last response: in Overclocking
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March 27, 2009 1:41:26 PM

Could anyone please give me a begginners guide to oc the above CPU with the GA_M750 SLI mobo? I have a decent cpu cooler and fan fitted and it idles around 37 deg. I've followed a few guides and get lost after a while.

If I drop all the setting in bios I can push FSB to about 263. But when I try and incresae cpu clock multi to anything above 11 it bombs out?

SiSoftware Sandra

System
Host Name : STUDYPC
User : Sudy
Workgroup : WORKGROUP

Processor
Model : AMD Phenom(tm) II X4 940 Processor
Speed : 3GHz
Model Number : 9000
Cores per Processor : 4 Unit(s)
Threads per Core : 1 Unit(s)
Type : Quad-Core
Internal Data Cache : 4x 64kB, Synchronous, Write-Back, 2-way, Exclusive, 64 byte line size
L2 On-board Cache : 4x 512kB, ECC, Synchronous, Write-Back, 16-way, Exclusive, 64 byte line size
L3 On-board Cache : 6MB, ECC, Synchronous, Write-Back, 48-way, 64 byte line size, 4 threads sharing

System
System : Gigabyte Technology Co., Ltd. M750SLI-DS4
Mainboard : Gigabyte Technology Co., Ltd. M750SLI-DS4
Bus(es) : ISA PCI PCIe USB FireWire/1394 i2c/SMBus
Multi-Processor (MP) Support : No
Multi-Processor Advanced PIC (APIC) : No
System BIOS : Award Software International, Inc. F7
Total Memory : 3.5GB DIMM DDR2

Chipset
Model : AMD (Family 10h) Athlon64/Opteron/Sempron HyperTransport Technology Configuration
Front Side Bus Speed : 2x 1.8GHz (3.60GHz)
Total Memory : 4GB DIMM DDR2
Memory Bus Speed : 2x 400MHz (800MHz)

Video System
Adapter : 2x NVIDIA GeForce 8800 GT (512MB DDR3, 614MHz/1.43GHz/2x900MHz, PCIe 2.00 x16, SM4.0)

Graphics Processor
Adapter : GeForce 8800 GT (1.01, 512MB, 1.60GHz)
Adapter : nForce 750a SLI (1.01, 512MB, 1.20GHz)

Storage Devices
NVIDIA STRIPE 465.75G 500GB (RAID, NCQ) : 466GB (C:) 
LITE-ON DVDRW LH-20A1S (RAID, DVD+-RW, CD-RW, 2MB Cache) : 3GB (D:) 
OJQPOD AZCDQ3C96V (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R) : N/A (E:) 

Logical Storage Devices
Hard Disk (C:)  : 466GB (NTFS) @ NVIDIA STRIPE 465.75G 500GB (RAID, NCQ)
Mar 12 2009 (D:)  : 4GB (UDF) @ LITE-ON DVDRW LH-20A1S (RAID, DVD+-RW, CD-RW, 2MB Cache)
3.5" 1.44MB (A:)  : N/A
CD-ROM/DVD (E:)  : N/A @ OJQPOD AZCDQ3C96V (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R)

Peripherals
LPC Hub Controller 1 : Giga-Byte 075Dh
Audio Device : Giga-Byte Realtek ALC1200 8-Channel High Definition Audio Codec
Audio Codec : Realtek Semiconductor Realtek 885 High Definition Audio
Audio Codec : Nvidia 0002h
Serial Port(s) : 1
Parallel Port(s) : 1
Disk Controller : Giga-Byte MCP78S [GeForce 8200] IDE
Disk Controller : Giga-Byte 0AD8h
USB Controller 1 : Giga-Byte MCP78S [GeForce 8200] OHCI USB 1.1 Controller
USB Controller 2 : Giga-Byte MCP78S [GeForce 8200] EHCI USB 2.0 Controller
USB Controller 3 : Giga-Byte MCP78S [GeForce 8200] OHCI USB 1.1 Controller
USB Controller 4 : Giga-Byte MCP78S [GeForce 8200] EHCI USB 2.0 Controller
USB Controller 5 : VIA VT6212 USB Controller
USB Controller 6 : VIA VT6212 USB Controller
USB Controller 7 : VIA VT6202 USB 2.0 Enhanced Host Controller
FireWire/1394 Controller 1 : Giga-Byte GA-EP45-DS5 Motherboard
System SMBus Controller 1 : nVidia MCP5+ SMBus 1
System SMBus Controller 2 : nVidia MCP5+ SMBus 2

Printers and Faxes
Printer : Microsoft XPS Document Writer (600x600, Colour)
Fax : Microsoft Shared Fax Driver (200x200)
Printer : Canon MP610 series Printer (USB, Colour)

Network Services
Network Adapter : NVIDIA nForce 10/100/1000 Mbps Ethernet (Ethernet, 100Mbps)

Power Management
Mains (AC) Line Status : On-Line

Operating System(s)
Windows System : Microsoft Windows Vista Ultimate 6.00.6001 (Service Pack 1)
Platform Compliance : x64

Performance Tips
Warning 100 : Large memory sizes should be made of Registered/Buffered memory.
Tip 2546 : Large memory modules should be ECC/Parity.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.

More about : idiots guide ii940

a b V Motherboard
a b K Overclocking
March 28, 2009 9:38:01 AM

Hey PacMan, welcome to THG
I'm not sure how you got to 263 on the FSB, but WOW!!! My 940 doesn't like going above 210!!
Anywho, the best way for clocking a 940 is to go back to the stock 200 and then start raising the multiplier (currently mine is set at 18.5, FSB at 207 @3830) After finding where you can get to with the multiplier, then add a couple of points to the FSB, . Give it a try and let me know what happens?
March 29, 2009 8:54:03 PM

unclefester said:
Hey PacMan, welcome to THG
I'm not sure how you got to 263 on the FSB, but WOW!!! My 940 doesn't like going above 210!!
Anywho, the best way for clocking a 940 is to go back to the stock 200 and then start raising the multiplier (currently mine is set at 18.5, FSB at 207 @3830) After finding where you can get to with the multiplier, then add a couple of points to the FSB, . Give it a try and let me know what happens?



Hey fester, thanks.

I can get the fsb to about 204 with clock at 16 or drop the fsb to 200 and 18.5 on the clock multi.

I kind of get lost at this point, how can I raise the fsb higher?

I got 263 by dropping EVERY bios setting voltages, etc to low.
Related resources
a b V Motherboard
a b K Overclocking
March 29, 2009 9:02:35 PM

You may have to raise the voltage on your memory to add to the FSB. Just keep in mind that some memory manufactures will void their warranty if you go past recommended voltage specifications.
Sometimes loosening memory timings will also help, although with my memory it didn't seem to make any difference if I was at 4-5-5-15 or 6-6-6-18.
March 29, 2009 10:07:38 PM

Okay thanks.

What would the benefits (if any) in increasing the CPU voltage control?
a b V Motherboard
a b K Overclocking
March 30, 2009 12:55:52 AM

Upping the voltage will help stability with higher clock speeds. The draw back is that with increased voltage you will have increased core temperatures and without an after market cooler may not be feasible to stay within spec. 62c is the max before built in thermal protection will shut down the system.
June 3, 2009 11:00:21 PM

@ Unclefester: you wont get above 210 if everything else is left the same, you probably pushed your ram to the limit.

To get the CPU Frequency as high as you want you need to drop CPU - NB Multiplier down from 9 to a lower number.

As standard: 15 x 200 = 3000mhz (CPU Speed) --- Multiplier x CPU Frequency
9 x 200 = 1800mhz (North bridge / FSB / HTLink ) ----- CPU - NB Multiplier x CPU Frequency

Dropping your NB multiplier down will let you raise your CPU multiplier------ 225 x 8 = 1800 FSB (standard speed ) 225 x 15 = 3375. CPU

To get the FSB really high you need to lower your ram in the bios as this will continue to climb with any rise in the FSB.
If you have 1066mhz ram drop it back to 800mhz in the bios you then have nearly 300mhz to add onto the fsb before the ram will max out.



June 4, 2009 4:13:39 AM

The man makes a point .
a b V Motherboard
a b K Overclocking
June 7, 2009 5:06:27 AM

@XTC28, yes he does.

@Trounce, I've tried similar combination as you have posted, to no avail. My 940 doesn't like those settings and won't even post. Now when I had a 5400BE installed I could raise the FSB to 260, but couldn't lower the NB mulitiplier, so it may have more to do with my MoBo.

Others who read what you have posted in this thread may find your outline helpful though. It's always good to try different approaches when OCing and I do appreciate your advice.

And welcome to the THG forum guys
!