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Override CPU ratio (FSB multiplier) regulation

post #1 of 6
Thread Starter 
I am currently working on a CPU overclocking project that is specific and NOT having to do with gaming performance or performance in general.

Without any background my question is this:
With EIST speedstep technology turned off, CE1 state turned off, my CPU will regulate its FSB multiplier when the cores get too hot. For example, at a normal state I'm running at 4.77Ghz (116.5 x 41.0). If I ramp up the load to the point where thermal throttling happens, the multiplier (41.0) rapidly regulates and drops down to save the cpu from crashing. I want to fix the multiplier at 41.0 so I get a blue screen or some other hard crash. ---yes i know this is burning out the cpu, its ok---

The goal is to crash the cpu after turning off a liquid cooling system. This will demonstrate that with the cooling system, the cpu is reasonably stable and without it the cpu will have a hard thermal crash.

Specs:
Intel i5 4670K 3.4Ghz processor
Gryphon Z87 motherboard BIOS V0903
post #2 of 6
Isn't thermal protection hard coded into the CPU regardless of BIOS settings? I thought so.
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wevs rig
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i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
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post #3 of 6
You can try disabling the thermal protection in the BIOS, but I think the CPU will still throttle itself no matter what.
post #4 of 6
experiment with the software found at http://cpu.rightmark.org/

I read on another forum that it has some ability to control aspects of the throttling, though I've never used it, couldn't hurt to look

good luck!

EDIT: if it even supports your CPU....i just saw it hasn't been updated since 2008....blah
post #5 of 6
Intel builds thermal throttling into their hardware that can not be disabled with any user software. Their CPUs will slow down to a crawl if necessary with a combination of multiplier and clock modulation throttling. I gave my Core 2 E8400 a mild overclock and some extra voltage and then turned off the CPU fan just to see what would happen while running Prime95. It didn't take too long before over heating but then it throttled just enough to maintain itself a couple of degrees under the built in thermal throttling temperature. It ran 100% reliably for 3 hours before I gave up trying to kill it. From what I have seen, Core i processors are even happier when running near TJ Max. You might be waiting a while to see a BSOD.

http://img11.imageshack.us/img11/276/hote8400fw5.png

http://img27.imageshack.us/img27/6216/torturetest.png

If the heatsink gets loose and the core temp goes higher, it will probably reach the thermal shut down temperature about 25C beyond TJ Max. At this temp it will do a graceful shutdown so you still won't see a BSOD.
Edited by unclewebb - 8/22/13 at 2:48pm
post #6 of 6
If you want to see a bsod from overheating then just buy phenom ii. Those hate temps over 60 degress C when overclocking. For example my deneb last time crashed when reaching 64oC. Or just get any cpu that get's extreamly unstable when running hot.
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GROM II [Gaming]
(34 items)
 
 
MIR[server]
(16 items)
 
CPUMotherboardGraphicsGraphics
i7 5820K@4.6Ghz@1.325V 2.05V input Asrock X99 Extreme 4 Sapphire R9 290X [Uber Mode] Nvidia Geforce GT240 GDDR5 512MB [PhysX + analo... 
RAMRAMRAMHard Drive
Crucial Ballistix 2400mhz 4GB 1.3V Crucial 2133@2400mhz 4GB 1.3V Crucial 2133@2400mhz 4GB 1.3V Seagate 4TB 
Hard DriveHard DriveHard DriveCooling
Samsung 840 EVO 120GB[OS] WD Red 1TB Samsung 840EVO 120GB[Arma 3] Koolance 380A [modded for LGA2011v3] 
CoolingCoolingCoolingCooling
Black Water Ultimate 123 [3x Corsair AF120 Perf... MCP655 with Alphacool HF acetal top [5th gear] Feser 10/13 UV Tubing Alphacool CKC clear 
CoolingCoolingCoolingOS
Cooltek 120mm rad [antec tri-speed] Cooltek 120mm Rad [Corsair SP120 High Performan... Alphacool GPX-A 290 [290X waterblock] Windows 7 Ulitimate 64 bit  
MonitorMonitorMonitorMonitor
LG 29EA93 [2560x1080] LG L1715S [1280x1024] Samsung SMB2030N [1600x900] DIY display on V59 controller[1366x768@1440x900] 
KeyboardPowerCaseMouse
4Tech X7 G800 Cooler Master Real Power 850w Cooler Master Haf 932 Amd Edition Microsoft Mobile Mouse 4000 
AudioAudioAudioOther
Superlux hd681 FiiO E07K SoundMax Superbeam [bundled with P5B DLX] Scythe Kaze Master Pro 6 chanell 
OtherOther
2x Sharkoon 30cm red cold cathodes 2x Revoltec 10cm UV cold cathodes 
CPUMotherboardGraphicsRAM
Athlon II X2 250 @2GHZ @1core Gigabyte 870A-USB3 Ati X600 128MB GoodRam 4gb 1333mhz 
Hard DriveHard DriveHard DriveHard Drive
Hitachi Ultrastar 1TB Samsung 40gb[OS] 6x Hitachi 2TB (RAID 6) 2x160GB RAID 1 
OSPowerOtherOther
Debian 8.2.0 x64 Pentagram Silent Force 460W Ever Eco Pro 700 CDS [UPS] Edimax EW-7318USg [Access Point] 
CPUCPUMotherboardGraphics
Xeon E5420 Xeon E5420 HP ML350 G5 motherboard HD5450 with HD5770 cooler on passive [PCIE X4] 
RAMHard DriveHard DriveHard Drive
20GB FB-DIMM@800mhz 2x40GB WD RAID0 Sata [11year old as for 2015] 2x73GB HP 15K RPM RAID0 SAS HP 10K RPM 143GB SAS 
Hard DriveHard DriveMonitorPower
HP 10K RPM 143GB SAS HP 10K RPM 143GB SAS Fujitsu W19-1 [1440x900] Delta DPS 800W 
CaseOtherOtherOther
HP ML350 G5 case Adaptec SATA II RAID 1220SA ADAPTEC SCSI-CARD 29320LP Quantum TC-L32BX LTO 3 [tape drive] 
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