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Intel Core i7 Overclocking: 130 Watt Speed Limit
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Old 4th November 2008, 21:24   #1
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Default Intel Core i7 Overclocking: 130 Watt Speed Limit

Overclocking is very different on the Core i7. Unlike the Core 2 or Pentium D processors, the Core i7 CPU can monitor the current it draws as well as its power consumptionóif it exceeds a certain level, the processor automatically reduces its clock speed. Intel calls this feature "Overspeed Protection." The limits hard-wired into the core are 100 A and 130 watts. Only the Extreme Edition allows the user to increase these values as they like, effectively circumventing the protection mechanism altogether.

Thermal power loss rises especially quickly when the core voltage is increased. Thus, it is entirely possible that a lower model Core i7 may offer excellent overclocking potential, but it will be constrained by the Overspeed Protection feature when its power dissipation triggers it. Obviously, Intel wants to prevent customers from buying an inexpensive processor and then overclocking it to very high or even extreme levels. Apparently, Intel has realized that the good overclocking potential of its processors has led ambitious users to choose less expensive models, relegating the faster (and more expensive) CPUs to the sidelines.

http://www.tomshardware.com/reviews/...em,2057-7.html
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Old 4th November 2008, 21:28   #2
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Tom's Hardware's Chris Angelini -
"Intel has added an Overspeed Protection to its Core i7 processors, keeping them from exceeding 130W or 100A. The company says itís a safeguard in environments where that much power or current could result in a problem. The workaround is a BIOS switch. Overclockers will want to disable it before trying their hand at faster frequencies."

"So, right at launch, you can expect most motherboard vendors (even Intel) to include an override of that Overspeed Protection function. On the DX58SO, itís called CPU VR Current Limit Override. In ASUSí Rampage II Extreme, itís the CPU TM Function, which engages throttling based on TM2."
http://www.tomshardware.com/reviews/...i7%2C2063.html

Intel's Francois Piednoel -
"I am to be VERY VERY clear, there is not Overspeed Protection, we have a BIOS setting to bypass the PCU control of Current and Power. On smackover, it is call "CPU VR Current Limit Override", and it will allow you to bypass the thermal and courant limites on the Core i7 920 ans 940. Who ever claim the otherway around did not read the specifications enough hehehhe

we have recommanded to the motherboard makers to follow our steps.
So, relax, and don't worry ...

http://www.xtremesystems.org/forums/...&postcount=102
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Old 4th November 2008, 21:34   #3
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interesting post @ XS from thread linked above
Quote:
So, here is the math:

any SB750 mainboard = $120
Phenom X4 9950 = $165
8GB DDR2-800 = $92
------------------------------------
total = $377

MSI P45 Neo-F = $95
Q6600 = $190
8GB DDR2-800 = $92
------------------------------------
total = $377

MSI P45 Neo-F = $95
Q9550 = $319
8GB DDR2-800 = $92
------------------------------------
total = $511

MSI Eclipse = $400
i7 920 = $320(which is discussable since it doesn't exist on market)
6GB DDR3-1333 = $250
------------------------------------
total = $970

MSI Platinum 295$
i7 920 320$
6GB DDR3-1066 140$
-------------------------------
755$

Sorry, but i7 is not a feasible investment at this point of time.
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Old 4th November 2008, 22:30   #4
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THG already posted an explanation for their strange results, they simply messed it all up. I wonder how they actually dared publishing all that BS without even making sure they switched the mentioned limit off in the BIOS... Pretty embarrassing, one more reason not to bother with their amateurish reviews.
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Old 4th November 2008, 22:49   #5
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they do bring forward a good tweak for us to check in the BIOS as apparently not all boards will allow to disable the check
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Old 6th November 2008, 02:53   #6
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Good to know about those settings. TR didn't mention them, but didn't seem to have any trouble or any need to modify voltages to get a 200MHz QPI bus http://techreport.com/articles.x/15816/9
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