I am trying to overclock for the first time, and I am following this guide: http://www.clunk.org.uk/forums/overc...beginners.html he recommends to set vcore to 1.1. My computer will not boot into windows with his recommended bios settings. I thought maybe the vcore was too low, as I think the guide was initially written for 920's. he also confusingly talks in the intro about keeping Vcore at 1.25, but then in the step by step uses 1.1. any help would be much appreciated. If anyone has the same motherboard as me, I would be interested in your overclocking bios settings, this guide keeps referring to an Asus motherboard. edit - I am try for 3.8 now, I would be interested in a recommended Vcore for 3.8. Base clock is 181 with multiplier of 21. I intend to leave it running overnight with a Vcore of 1.3 - Is that too high?
looking at cpuz when running my normal (not overclocking/ factory settings) bios. It seems to be showing some strange results. it says my multiplier is 22 - that is not what it is set in the bios. And it gives my ram timings as 7, when they are all set at 8 in the bios- any idea what is going on?
http://www.techreaction.net/2010/09/07/3-step-overclocking-guide-bloomfield-and-gulftown/ The above guide may be of more use to you. However, really time and time again, you'll get told to start with the default and slowly increase until it becomes unstable, then increase voltage or drop speed. I'm afraid I don't have any answers to your specific questions, though.
I have the same board as you, and have my 920 running at 3.8GHz. I'll grab my BIOS screen later for you, as I'm in the middle of something now and don't want to reboot. It can run Prime 95 and Intel Burn Test for over 48 hours. It's rock solid and never crashes, even during heavy video encoding that uses all my available RAM.
thanks a lot mate, that will be really helpful. I had heard 930's require bait more juice than 920's? It has been running fine overnight at 3.8 with a Vcore of 1.3. I will post some photos of my settings when I have had my breakfast!
This is the settings I used, you will note I left a lot on auto - for example I did not adjust the uncore/vpi features, or any voltage settings other than Vcore or DRAM. Any disadvantage in not tweaking everything? this did seem to achieve a stable overclock at 3.8. I was happy with my temps, they hovered around the low 70's under load, and the mid 40's under standard use - using a NZXT Havik 140. In principle therefore I am happy with this profile, though would be happy to take some pointers on where it could be improved. I am going to try dropping the Vcore now, I jumped from straight 1.25 (blue screened) to 1.3 as I was keen to get something up and running before I went to bed! Advanced CPU Features: CPU Clock Ratio ................................ [21 ] Intel(R) Turbo Boost Tech ................. [Disable] CPU Cores Enabled .......................... [All] CPU Multi Threading ..........................[Enable] CPU Enhanced Halt (C1E) ................. [Enable] C3/C6/C7 State Support ................... [Disable] CPU Thermal Monitor ........................ [Enable] CPU EIST Function ............................ [Disable] Virtualization Technology ................. [Disable] Bi-Directional PROCHOT .................... [Enable] Uncore & QPI Features: QPI Clock Ratio..............................[Auto] QPI Link Speed ..............................6.5GHz Uncore Clock Ratio........................[Auto] Uncore Frequency ........................3620MHz Isonchronous Frequency ...............[Enable] Standard Clock Control: Base Clock (BCLK) Control .................. [Enable] BCLK Frequency (MHz) .........................[181] PCI Express Frequency (MHz) ............. [100] C.I.A.2........................................... ....... [-] Advanced Clock Control: CPU Clock Drive ..............................[700mV] PCI Express Clock Drive ................ [700mV] CPU Clock Skew ............................ [0] IOH Clock Skew ............................. [0] Advanced DRAM Features: Performance Enhance .......................... [Standard] Extreme Memory Profile (X.M.P) ........... [Profile1] System Memory Multiplier (SPD) ........... [ 8] DRAM Timing Selectable (SPD) ............. [Auto] Channel A + B + C Channel A Timing Settings: ##Channel A Standard Timing Control## CAS Latency Time ..................[8] tRCD ......................................[8] tRP ........................................[8] tRAS ......................................[24] CR..........................................[2] B2B........................................[-] Advanced Voltage Control: CPU Intel Core i7 920 D0 Stepping Load Line Calibration .................... [Standard] CPU Vcore ......................................[1.3000V] QPI/VTT Voltage 1.150v .................[Auto] CPU PLL 1.800v ..............................[Auto] PCIE 1.500v ...................................[AUTO] QPI PLL 1.100v ..............................[AUTO] IOH Core 1.100v ............................[AUTO] ICH I/O 1.500v ...............................[AUTO] ICH Core 1.1v ................................[AUTO] DRAM DRAM Voltage 1.500v .............. [1.64] DRAM Termination 0.750v.......... [AUTO] Ch-A Data VRef. 0.750v ...........[AUTO] Ch-B Data VRef. 0.750v ...........[AUTO] Ch-C Data VRef. 0.750v ...........[AUTO] Ch-A Address VRef. 0.750v ........[AUTO] Ch-B Address VRef. 0.750v ........[AUTO] Ch-C Address VRef. 0.750v ........[AUTO]
In CPUz where it states the core voltage, is that accurate? It never seems to match what I have set it to. e.g in this instance the Vcore is set to 1.275 but the core voltage in CPUz read 1.216: http://imageshack.us/photo/my-images/839/cpuzat1275.jpg/
Was that under load? voltage will drop off a little under load. That's what Load Line Calibration is for. However, LLC causes other problems with stability, so I find it best to leave LLC off, and set a voltage a little higher, so when you get vdroop, it falls to where you want it.
Not sure how useful this will be, but here's my RAM settings, as I had problems with the XMP profiles insisting on a 2T command rate.
I tried dropping the Vcore down to 1.262, it ran fine for an hour, but when I opened firefox it blue screened. Firefox had about 10 tabs loading at the same time, so I am guessing that was just a bit too much on top of prime95. The code was 0x0000001E - I think I have read that that indicates i need more Vcore. When you are putting your system under load do you do anything else at the same time -e.g browse the internet/send emails? I was wondering how I should interpret the fact it blue screened - i.e I feel that it maybe wouldnt have done so if I hadn't intervened.
If it's stable, it shouldn't crash. It will be damned slow and unresponsive as you're maxing it out with the stress tests, but I can run other stuff while stressing if I want. You really need to stress it overnight to ensure it's stable. It may go for several hours before it falls over. I don't consider a rig stable until I can at least run Intel Burn test for 24 hours without a crash.
