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need some help with overclocking my pc
i'm new at this so if anybody has the time to guide me i would be very grateful

my rig

Quad Q6600
EVGA 790i ULTRA SLI
4 GB DDR3, PC-10666, 1333 MHz, PATRIOT

i tried to overclock on my own but it crashes every time
i am desperate for some answers

thanx

9x400 = 3.60 GHz

The fastest divider you can use without overclocking the RAM is 1:1

DRAM Final Clockrate = (2 x FSB)/Divider

=(2x400)/1
=800 MHz

If you wanted to use a 1:2 divider, the math becomes:

=(2x400)/(1/2)
=800/0.5
=1,600 MHz

No way can you hit that speed!

Vcores aren't something that are identical for each system... you have to stress test to find the min. stable vcore for you specific system at a given set of conditions (9x333 for example).

Simply set the divider in your BIOS to 666.

Dude, you need to post more details such as vcores for the MB, RAM, and CPU. My guess is that you need to up them (NB vcore, CPU Vcore, maybe VTT). Have a re-read of the guide.

i hope this ia all you need to know if there is sometnig else please do tell me

If core temp seys the temp are at 69*C after 1 min is it safe to keep running prime95? (get the same result 7*440-7*475 FSB and alvays shut down prime95 manualy when it hits 69*C)Or should i keep lovering the FSB? Havent canged any other settings

This is my specs

Corsair TW3X4G1333C9DHX 2x2048MB (tot. 4096MB) DDR3 1333MHz

Arctic Cooling MX-2 Thermal Compound 4gr

Asus P5K64 WS iP35 4DDR3-DIMM 2PCI 4PCIe SATA Raid Audio DUAL GB-LAN Socket775 ATX

Intel Core 2 QUAD Q6600 2.4GHz 8MB FSB1066 Boxed (with cpu-cooler!) Socket 775 (G0)

Windows Vista Home Premium 64-bit DVD SWE OEM

ZEROtherm Nirvana NV120 CPU Cooler -775/AM2

A sidemounted fan that sucks air

And a 750W powersuply

Has anyone overclocked the Q9550 yet? I'd like to bump her up to 3ghz...

I think this is correct - DDR, DDR2 and DDR3 all operate at twice the FSB. To calculate the bus frequency off the memory frequency rating, you just divide by 2.

DDR-266 <-> FSB @ 133 (http://en.wikipedia.org/wiki/DDR_SDRAM)
DDR2-800 <-> FSB @ 400 (http://en.wikipedia.org/wiki/DDR2_SDRAM)
DDR3-1333 <-> FSB @ 533 (http://en.wikipedia.org/wiki/DDR3_SDRAM)

Perhaps it's because it's DDR-400?

Note that the peak transfer rate is calculated off the memory clock, and not the FSB - thus DDR memory with a 200MHz memory clock rate would have the same peak transfer rate as a DDR2 memory with a 100MHz memory clock rate. I think peak transfer rate = memory clock * prefetch buffer size * 8, where 8 is number of bytes transferred in each operation. The prefetch buffer for DDR is 2, DDR2 is 4 and DDR3 is 8 bits.

Otherwise, great guide graysky.

Okay there is just a little confusion on my part about a few things and there are some settings I can't find in my BIOS. First here are my computer specs:

Motherboard:
XFX nForce 780i 3 way SLI Intel 775 socket
FSB clocked to 1480 right now
8G DDR2 (I'm only using 4 right now)
I'm only running 2 Graphics cards at the moment in SLI mode

CPU
Intel E8400 Dual Core 3.0G clocked to 3.33 with the FSB clock mentioned in the mobo above

Graphics Card 2 - XFX GeForce 8800GT 512 DDR3_SDRAM (Running in SLI mode)

Cooling Fan
Zalman CNPS9700 LED Air Cooled

Power Supply
Thermaltake 750W

Tower
Thermaltake Armor MX Full Tower

corsair mem - DDR2 800 2 - 2 gig sticks = 4G

I can only clock this CPU with this mother board by adjusting the FSB on the mobo according to tech support at the factory.

Here are some questions:

I don't see anywhere in my BIOS to set the ram divider ratio. I have a setting for my memory frequency which is set to max at 800 for my DD2 800 corsair memory sticks.

Spread Spectrum- I have 3 choices and only one is disabled in the factory settings

HT spread spectrum - should I enalbe or disable and what does it do? No info when highlighted

PCIe Spread Spectrum - should I enalbe or disable and what does it do? It says it's a selection for nForce MCP when I highlight it.

SATA spread spectrum - should I enalbe or disable and what does it do? This one was disabled as a factory setting and only says SATA spread spectrum selection when highlighted like that is supposed to be helpful.

I can't find these anywhere in my bios can someone help me with what they might be called with my system?:

CPU TM fuction - I think my BIOS calls this CPU Thermal Control and if that is correct then i have choices - TM1 - TM2 or both.

TM1 being thermally throttled but cutting active processor clock cycles
TM2 being thermal throttling is achieved by reducing the cpu multiplier and cpu core voltage
TM3 is both TM1 and TM2 working together

What is the best choice for me on thermal throttling - 1 2 or both?

PECI - can't find anything like this
PCI clock syncronization - can't seem to find anything like this either

I'm planning on doing a build within the next 2 weeks. This is the motherboard I've picked.


ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard with an E8400

The case I want is an Antec 900 which seems to have some decent fans in it.

I just wanted to clearify, According to the thread if should get 800 mhz (or pc2 6400) rather then the 1066 mhz rated memory so I can achieve "synchronous mode"? I would like to fiddle with as little as possible so I can achieve 3.4 to 3.6 ghz (Not looking to go any higher then this) on my over clock. With the ratio of 400 mhz fsb and 1066 mhz memory speed (not sure what that ratio is) would I be able to run my system stable without increasing Vcore voltages?

I've also been told that a Wolfdale processor should do 3.6 ghz easy with just a fsb modification and I shouldn't worry about Vcore settings and other stuff in my bios. Is there any truth to this?

Edit: I was also wondering how much of an impact the difference in speed in my games would be between running memory at 800 mhz as opposed to 1066 mhz?