Processor i7--920 -Overclocking & Virtualization

First Time OC: core i7 920 on p6t Deluxe
Especificaciones de los procesadores Core i7

ID de procesa dorΔ	Caché Intel inteli gente	Frecuencia nominal	Trans ferencia con Quick Path Inter connect	Frecuencia de DDR3	Contro lador de memoria integrado	Tecnología Intel® Hyper-Threading	Quad -core
45 nm
i7-950	8 MB	3,06 GHz	4,8 GT/s	800/1066 MHz	3 canales, 2 módulos DIMM/canal	8 subprocesos de procesamiento
i7-940	8 MB	2,93 GHz	4,8 GT/s	800/1066 MHz	3 canales, 2 módulos DIMM/canal	8 subprocesos de procesamiento
i7-920	8 MB	2,66 GHz	4,8 GT/s	800/1066 MHz	3 canales, 2 módulos DIMM/canal	8 subprocesos de procesamiento

System
ASUS p6t Deluxe V2
Retail Core i7 920
12 gb Dominator 1600 at 8-8-8-24 1.66v
EVGA OC gtx 260
PC POWER & COOLING 750 SILENCER
WD Velociraptor 300 Main
WD RE 1gb Data Drive
Cooling:
Retail Intel CPU HeatSink and Fan with Artic Silver Thermal Paste
PCI Slot Exhaust Fan High
120 MM TriCool at High Rear Fan
Domintor Memory Fans
Northbridge Fan on High
CPU temp normal usage around 44-49C
MB Temp Normal Usage 41-44C
CPU Temp during Performance Test 64 at high of 55C
MB Temp during Performance Test 64 at about 50C
Another cooling solution (heat pipes)

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Overclocking

Cuando se comenzó a hablar de los procesadores Core i7 y la arquitectura Nehalem las primeras pruebas sugerían que su desempeño en juegos y habilidades para el overclocking no eran muy buenas.
Después de todo, un procesador Core 2 Duo puede usarse sin problemas hasta un 1GHz por encima de su frecuencia nominal . Es más, cuando procesadores como el Core 2 Duo E6700 salieron al mercado su desempeño en juegos logró superar fácilmente a muchos procesadores de alto desempeño como el Pentium D y Athlon64 X2.

Los procesadores Core i7 pueden funcionar a mayores frecuencias con misma facilidad que los procesadores Core 2.
El Core i7 965 Extreme Edition de 3,33GHz a 3,88GHz sin problema alguno. Estamos seguros que no habrá inconvenientes para llegar a los 4,0GHz.

Overclocking Core i7-920 Próxima-frecuencia:4,2 GHz
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First of all. There is no sure overclock level that you can reach. Trial and error is the best way to go. Even with an extremely high voltage, both CPU and NB ones, there is no guarantee that the one chip that you have reaches even a moderate frequency.

If you want to be as safe as possible, just raise the FSB in small increments. Run Prime95 torture test for 5 mins or so, if it seems stable, go back to BIOS and raise it again. When it hits an unstable point, go back to the setting it was stable at, or raise the Vcore a bit (the slight risk of breaking something is there, but...). Then repeat the FSB tweaking. If you don't seem to get good results, then you can try lowering the FSB and upping the multiplier. After maxing the multiplier (and if it has been stable at every setting), you might want to up the FSB again. Trial and error.
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Prime95 small FFT(or FTT, can't remember ATM) testing for 30 mins after the final reached clockspeed you're going to keep is recommended, more like mandatory in fact. Otherwise, if it seems stable and performs well, congrats, you have followed the instructions well enough to achieve a nice OC. :=) Still, increasing the BCLK in smaller increments would've been the "correct" way to do that, but as long as it worked, fine.
Also, check your RAM when you go high in OC. If the Dominator runs at too tight timings and too high ratio, it may ruin the OC and cause unstability.
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Virtualization
All of Core i7 series should support EPT/VPID. x58 supports "VT-d2" (virtualization technology for directed i/o - second revision), although note that this is more of an internal and informal name for VT-d enhancement features, not an official term that you will see on product specs.
Virtualbox
i7 920 cpu with HT and vt-x both enabled; 6gig of ddr3 ram; the gpu has 896M of memory; the host OS is Vista x64
I do 2 cores and 1gb of ram per VM.. I have i7 920 / 6gb ram/ whatever.
The VMsdon't need to have any more power than that, and it runs great.
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No need to give so much video memory to the guests: for now, they don't need it, and, until 3.0.2, this could generate some screen corruption (should be fixed in 3.0.4). 64 Mb should be enough.
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WMWare
Vista x64 host + Core i7 920 + Workstation 6.5.1 = W2k3 x64 guest will not boot because of "no VT"
Another common BIOS bug is to forget to enable VT on all cores of a physical processor. To see if this is your problem, you can download this ISO, burn it to a CD, and boot your host from that CD. It will tell you if VT is only enabled on some cores.
The aforementioned configuration option will also help if this is the problem.

http://communities.vmware.com/thread/181906