# Need some tips on OC a q6600 on a MSI P7N SLI Platinum

#### challey

##### New Member
Got a MSI P7N SLI Platinum MB and i wanna OC my q6600. I've read up on lots of the OC for noobs, and i can't find out how to set my FSB to 333, as alot of peeps tell me to do. In my bios it says 1067(or something) next to the FSB.

I got a tagan 850w PSU and i have a Zalman CNPS8700 CPU cooler.

Anyone OC'ed on a MSI P7N SLI Platinum that can help me plx?

#### desertmonk

##### New Member
Ah ****. Just wrote almost pages on this to help you, and just realised i'd misread the question

On intel CPUs (as opposed to AMD's HT system) there is a "FSB" and a "rated FSB." 1066 is the "rated FSB." To get the FSB that is times by multi to get clock speed, you need to divide rated FSB by FOUR.

So on a 1066mhz (1067 is just a rounding error) CPU like the Q6600 you divide it by 4 to get an FSB speed of 266mhz. The Q6600 thus has a multiplier of (2400/266=9)

So if you set the FSB to 333mhz you would actually have to set it to a rated FSB of 1333 (333*4)
This would give you a clock speed of *drum roll* 333*9 = 3.0ghz

The next "official" step in the world of FSB would be to set the FSB to 400 (i.e. 1600) to get a CPU speed of 3.6ghz. However, 3.6ghz is probably totally out of the question, especially w/o water cooling and on stock voltage.

So realistically (if you have the option to) the next step is to set the CPU multi to 8 (you should be able to make it lower than 9, but not higher than 9) and set the FSB to 400. This way you get a very fast rated FSB (1600mhz) AND you get a clock speed of 3.2ghz (you should be runnign prime, adding voltage as appropriate etc etc)

After that i'd personally go for an FSB of 425mhz (assuming you know your max FSB, which you generally should do before you try to OC, but hopefully you should have read about that) for a CPU speed of 3.4ghz, then try a 450mhz FSB for 3.6ghz (assumign it is still stable in Prime95/Orthos/etc)

THE BASIC THING IS RATED FSB OVER 4 EQUALS FSB. Sorry for the rambling So to set a FSB of 333, you need to change 1066 to 1333.

#### challey

##### New Member
Well as i kinda stated in the rirst post, i'm a noob to OCing. When i try to set the fsb to 1333 (333) with the multiplyer set to 9 and set the voltage up. Then i save and exit bios, when i do this i cant seem to get any conection from my computer to my screen. It goes into Power saving mode. Is this something it should do or should i be able to get started with the clock right away?

##### New Member
try lowering the memory speed and loosen timings

#### challey

##### New Member
thanks guy's for fast replies Apreciated.

But what do you mean by loosen timings?

#### Cja123

It isn't in power saver mode, I'm pretty positive your BIOS isn't posting. Meaning there is a problem with some of your settings. Perhaps you need to turn up cpu voltage a little more or check your ram voltage. Most mother boards will keep RAM running at a specified "ratio" with your mother board. If your RAM is running at a 1:1 ratio, that means your rated RAM speed is 666 MHz. So I would either tweak the ram voltage or timings.

EDIT:

If you'd take some time to fill out your system specs in the user CP section, it would be much easier to help ya.

#### DonInKansas

yah, ram ratio was my first thought too.

##### New Member
as the above says running 1:1 ratio is the best and if your mems are running at 4-4-4-12 then try loosen it to 5-5-5-15 and add some volts

^ agreed.

#### challey

##### New Member
Ok I have filled out the System spec. Forgot to type my RAM is 6400. And here comes another qstion regarding the memorytiming:

In my BIOS it says:

CAS latency (CL) [auto] , 1-6
tRCO [auto] , 1-7
tRP [auto] , 1-7
tRAS [auto] , 1-15
tRC [auto] , 1-15
tWR [auto] , 1-6
tWTR [auto] , 1-15
tREF [auto] , 7.8uS and 3.9uS
1t/2t Memorytiming [auto] , 1T, 2T

What should i try out?

Really like the fast replys here

##### New Member
try 5-5-5-15 first

CAS latency - 5
tRCO - 5
tRP - 5
tRAS - 15

if FSB is 333 then your 6400 would be 667

#### desertmonk

##### New Member
From your replies and stuff, it seems as though you haven't read as much as i thought you had. I propose a max FSB test as a very good place to start... (anyone agree/disagree?)

Actually, no before that, lets go through the checklist right from the start, have you:

3Dmark06 trial version
(lets save memtest86 for later, if needed)

Those are 4 bits of ESSENTIAL software that every overclocker HAS to have. CPU-Z gives you a wealth of information and monitors voltages, multipliers, various clock speeds. This is a crucial piece of software as it lets you monitor what's going on everytime you boot up. Prime95/Orthos is a fantastic program. It puts your PC through a series of increasing stress tests. You should run Prime95/Orthos at level 8 for at least an hour between each relatively big jump (i.e. you'd run it for an hour at 2.8ghz, run it for 2 or 3 hours at 3.0ghz, run it for 6 hours AT LEAST on your final overclock) Speedfan lets you keep track of temperatures and manage fan speeds. The LOWER the temp of your CPU the HIGHER the STABLE CLOCK SPEED. I'll come back to temps a bit later.

Aftermarket cooler (99% essential ESPECIALLY on a Q6600 of all CPUs)

You should settle on a clock speed & cooling solution that means your CPU temperature rarely goes near 50, and certainly never exceeds 55 on a regular basis (degrees celcius) It is around 50 degrees in which the CPU becomes unstable as a result of heat.

System information. It is absolutely IMPERITIVE that you know all the neccessary information for your system. You should know (or at least have written down somewhere) your STOCK MEMORY TIMINGS (cas, ras, cas-ras, etc etc AKA 5,5,5,15 or whatever yours is) CPU MULTIPLIER, VCORE, VDROOP and MAX FSB (the important ones are in caps... errm lol...)

CPU multi is crucial to know, so that when you type in an FSB you know what clock speed it will result in
Vcore is important to keep track of (read up on net to see what sort of voltages other q6600owners are using)
Vdroop (how much your PSU/motherboard underestimates or under-supplies. Your fiddling around 0.05 volts at a time in most cases, so the slightest error in measuring can be an issue)
MAX FSB (requires more detail, so i'll go into it below)

List of things to do & order to do them in (IMHO from experience and other people's experience)

Run 3Dmark 06 to get a score, and to get an idea of idle/load CPU temperatures (move PC, use speedfan, get new cooler or whatever to get acceptable temps)
Run Prime95/orthos for 20 mins to get an idea of max temp you'll ever see (3dmark will give you a "everyday" idea of temp. Prime/Orthos will stress your CPU a lot more than normal everyday tasks)

Find max FSB:

loosen memory timings (hence you should know originals) by 1ns for each of the 4 main values
set RAM ratio to make the RAM speed below that of it's rated speed
put CPU multi on 3/4 or 1/2 of original
Keep on increasing FSB, then stress test, increase FSB, stress test...

You then know the max stable FSB, which gives you a fantastic bit of knowledge, you then know (for example) it is safe to use anything up to 423mhz. you can then work backwards (or forwards) with multipliers/FSB to find your max CPU speed. Then play around with voltage, FSB and CPU multi to achieve the highest clock speed with the highest FSB you can.

You can then set to work on memory, once you've passed a long stress test

Happy days