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The best place to start any overclocking venture is in the BIOS, and again the configuration of all the ASUS P7P55D motherboards is very much the same. Once in the BIOS the menu you are going to want to visit is titled “Ai Tweaker” and this is where all the action takes place. First of all you will want to set the “Ai Overclock Tuner” setting to [Manual], which will allow you to adjust things such as the base clock (BCLK Frequency).  By default the BCLK Frequency will be set to 133MHz, while the Core i5 750 clock multiplier with turbo mode disabled is 20x. Using the standard box cooler we had no problem with a base clock frequency of 166MHz, though we should point out that this increased stress temperatures from 71 degrees to a toasty 95 degrees. Before we reveal anything else about the overclock, let’s just run through the overclocking options within the BIOS of the ASUS P7P55D motherboards. Once the Ai Overclock Tuner option has been set to manual, the first option the user is presented with is the CPU Ration Setting. This option can be left on [Auto], which we recommend, to fix at 20x or lower. We are leaving this option on auto as it will allow us to use Intel’s Turbo mode. The next option is called Intel SpeedStep and this is a dynamic frequency scaling technology that is built into the Core i5 750, that allows the clock speed of the processor to be dynamically changed by software. This allows the processor to meet the instantaneous performance needs of the operation being performed, while minimizing power draw and heat dissipation. Then there is the Intel TurboMode feature, which has been implemented by Intel in their Core i5 and Core i7 CPUs, and is actually known as “Turbo Boost”. This feature also sees the CPUs performance dynamically increased on demand and is activated when the operating system requests the highest performance state of the processor. There are a few parameters that determine the upper limit of Intel Turbo Boost technology, such as number of active cores, estimated current consumption, estimated power consumption, and processor temperature. |
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Daniel Watt |
Posted on: 04/01/2010 02:56 PM
i followed this guide and my multipier alternates between x9 and x21? is this normall? my core tempertature is 67C |
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ProX |
Posted on: 04/01/2010 08:43 PM
You have EIST and SpeedStep enabled. The multiplier turns down when the processor is not being used heavily so save power and reduce heat. If you want to stop this turn these CPU options off in the BIOS. An operating temperature of 67c is good, what heatsink are you using? Also what frequency are you running at? |
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JM |
Posted on: 06/02/2010 02:08 AM
Hey guys, first off I really liked your overclocking guide. It was easy to follow and informative, I like how you explained the technical concepts without getting overly complicated. Anyway I happen to have an i5-750 and an ASUS P7P55D motherboard, which made following your guide even easier. Right now using your guide I overclocked my processor to 3.2 ghz, and it seems to work great. I changed the BCLK to 160 and the DRAM frequency to 1600 mhz. That went flawlessly, and I'm getting temps at about 32 degrees while under typical use (browsing internet...) and anywhere from 40-58 degrees when under load (gaming or archiving in winRAR). I'm amazed at how low my temps are even while it is overclocked...I guess that is my reward for buying a very good heatsink/fan. I highly recommend my heatsink to anyone looking to overclock at a reasonable level. (ZALMAN CNPS9700 LED 110mm) Now for the main reason I'm posting. I decided, since I am getting low temps at this level that I would try to achieve what you did in your guide and O'C it to 4.2ghz. I changed the BCLK to 200 bringing the actual BIOS reading to I believe 4.1. I then chose the option to set my RAM to 1600mhz once again. Whenever I use those settings, I get a BSOD right when I am about to log into Windows (tried it 3 times, happens at exact same moment). BS reports irql_not_less_or_equal. Do you know why this is happening? In the past when I've seen that BSOD on computers it means their memory is bad...usually it is some problem with memory...By any chance would you know how I can fix that problem? I'm fine having my i5 run at 3.2ghz, but it would be cool if I could replicate your results. Any input is appreciated, thx. My Comp Setup is: i5-750 ASUS P7P55D G.SKILL RIPJAW 1600 RAM (8gb) ZALMAN CNPS9700 HIS ATI HD 4890 Turbo |
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FootSoldier |
Posted on: 06/02/2010 12:59 PM
I have the same setup and reached 4.0GHz without a problem. @JM - have you tried 3.8GHz to see if everything works okay there? Also at over 4GHz have you tried lowering the memory frequency? Also how much voltage are you feeding the processor and even the memory? |
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JL421 |
Posted on: 06/27/2010 03:03 AM
I'm not sure what was wrong with your stock cooler, but with no oc, my system runs at a cool 45C under load. Then again, I scraped off the crap standard thermal paste and applied a semi-generous layer of artic silver. But over all, what is a good temperature to keep the cores at? The intel site says that Tcase should be no more than 72.7C, but I want to know what I could keep it around and still retain the processor life. |
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FootSoldier |
Posted on: 06/28/2010 11:11 AM
@ JL421 - what do you mean "wrong with your stock cooler"? Obviously there is nothing wrong, the temps are lower than yours. The real question is what is wrong with yours? A more obvious explanation could be that you do not have EIST enabled. |
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Dave |
Posted on: 07/16/2010 12:57 PM
Nice article - I'm even more convinced my next upgrade will be to a P5-750 (after years of AMD processors). But does the ASUS P7P55D motherboard support USB3.0? The specs I've seen just say "14 USB ports". USB3.0 may not be mainstream yet but USB3.0 disks are starting to appear. There does appear to be a Premium version of the P7P55D that supports USB3.0 and SATA-III, but the price looks very high. Can anyone recommend a P5 motherboard that overclocks so easily and DOES support USB3.0? |
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Ace |
Posted on: 07/08/2010 01:14 AM
Will S3 suspend (and resume!) work with the Asus board at 200bclk ? If not, what is the limit aproximatley ? |
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ProX |
Posted on: 07/17/2010 10:46 AM
@ Dave - What about Legion Hardware's review on the Asrock P55 board? http://www.legionhardware.com/articles_pages/asrock_p55_deluxe3,1.html |
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justpassingby |
Posted on: 08/05/2010 03:56 PM
This guide starts out allright and is probably informative for beginners. But i can't agree with telling people to just use the auto vcore setting. 1.5V vcore is way more than needed for the average 750 to run 4GHz and will likely degrade your cpu. When overclocking you want to stresstest till you have found the lowest stable vcore (yes, this takes effort). This is all the more strange when you consider that the mobo you use actually has the option to use dynamic vcore when overclocking (so you dont have to use fixed value vcore which will not drop in idle causing hot cpu). |
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sjollico |
Posted on: 08/14/2010 01:23 PM
@ #416 - The p7p55d-e pro has support for USB 3 and sata 6gbps I like this guide as well as I have the same setup, just awaiting my thermalright mux-120 cooler, however, I do agree with #457. The voltage is excessive, I would bring it down manually until the machine was unstable and then bump it up a bit for great stability and lower voltage (which in turn gives you lower heat) |
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dancingpotato Posts: 2 Joined: 2010-08-19 |
Posted on: 08/19/2010 05:06 PM
Super Super Super great guide !!!!!! Thank You so much Steve ! Bravo !!!!!!!! ----From CPU-Z 1.55 Core speed: ~ 4200.1 mhz Core voltage at idle: ~ 1.23 V Core voltage when 100% stressed with Prime 95: ~ 1.45 V Core voltage 100% stressed with BurnInTest 6: ~ 1.45 V Memory: DRAM frequency ~ 800 @ 7, 7, 6, 18 (8 GB manually configured) and I had to enable "Load Line Calibration" to correct memory instability ... the only two changes I made to the guide. ---From Core Temp 0.99.7 (Tj. Max: 99 C): Idle and low stress: ~ 30 C Full load Prime 95 : ~ 67 C Full load BurnInTest 6 @ 100% memory torture enabled: ~ 58 C ------------------------------------------------------ P7P55 LX i5 750 8 Gb G.skill: F3-16000CL9D-4GBTD Thermalright Mux-120 with Silverstone FM121 fan @ ~1450 rpm (very quiet) |
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dancingpotato Posts: 2 Joined: 2010-08-19 |
Posted on: 08/22/2010 03:52 PM
Posted by JM on 06/02/2010 03:08 AM
---------------------- Enable "Load Line Calibration" and it should solve your problem. |
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Marshall |
Posted on: 11/14/2010 08:45 AM
Perfect guide! Thanks for the walk through. I am running the I5 - 750 on a P7P55D-E Pro, 4 GB Corsair XMS3, and a Coolermaster Hyper 212 cooler and im stable in Prime 95' with 4213.7mhz with core voltage at 1.36v and temps on load at about 58 degrees. Thanks also to dancing potato about the load line calibration option. I was getting a BSOD until I saw your post. |
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idoop |
Posted on: 12/14/2010 08:24 AM
hey all! i have a question what programs do you guys use to test stability an see what your temps are? thy  |
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Marshall |
Posted on: 12/15/2010 10:05 AM
I use CPUZ, HWMonitor, TMonitor and Prime 95 for testing. |
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Tyler |
Posted on: 12/29/2010 06:52 PM
Any particular reason my computer freezes after doing this setup? i5 750 Lynn 4 gb ddr1600 |
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Paulus |
Posted on: 07/26/2011 09:19 AM
I'm using P7P55 LX MB and set shown settings in my BIOS, but a friend of mine told me to leave SpeedStep disabled. I noticed 45 C on my CPU, so I enabled SpeedStep to reduce cpu temp and just after loging in Win7 I had a BSOD. Everything runs smooth with SpeedStep DISABLED, why? I found out that C1E Support is disabled as well. What can I do to have SpeedStep working properly? |
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kyle Posts: 1 Joined: 2011-10-04 |
Posted on: 10/04/2011 05:06 PM
Hi all I have also got i5 750 with an Asus p7p55d deluxe board and i have followed this guide(btw is great and easy for a oc noob like me) i then run the prime95 torture test and this results in "FATAL ERROR: rounding was 0.5,expected less then 0.4" Does this mean the OC is not stable and please anyone who could help me out it would be much apreciated! Thanks |
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Mike |
Posted on: 10/13/2011 05:39 AM
If P95 is reporting rounding errors your OC is not stable. Try running OCCT - it's great for quick tests (takes an hour to complete). Will help you find your lowest vcore. On that note what is your vcore- from what I've seen around 1.4v should be enough for the 4ghz range on 750s. I can't agree with leaving vcore on auto. 1.514v is crazy high. I may just have a cherry chip but mine has run stable 3.6ghz @1.24v for more than a year. Turn off all the power saving features and turbo as well as they will make it harder to get a 100% stable OC. I happened to stumble on this when trying to find the max speed people are getting on these guys since my upgrade path was decided with the lackluster performance of BD and I'm less concerned about longevity. Wasted 169.99 on a 990FX board last month. Should have stayed faithful. IB seems to be where I will head to. |