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Overclocking an fairly old CPU

post #1 of 5
Thread Starter 
Hey guys. I am new to this site. I have read around two or three guides for overclocking my intel CPU on this site. So I am fairly well versed with the different terminology.

Now I have the following system .
Intel Q8400 2.667GHz stock + 4gb ddr2 800 MHz + Ati HD 4850 512mb ddr3 + Gigabyte S3G (Intel p35 ) mobo

I tried changing many settings in different combinations.

Mainly I changed the following while trying out different combinations

1. CPU FSB from 333 to 400
2. DRAM Multiplier from auto to 2.00 (In order to match memory strap / My mobo gives 800 / 1066 / 1333 straps)
It gave 800MHz after changing it to 2.00, keeping it on auto was giving 960 MHz

3. CPU voltage from Normal to 1.26 and 1.28

4. Also tried changing the memory voltage and FSB voltage up by one notches each.
5. I had also disabled Legacy Usb support as mentioned in some guides.

My CPU at stock speeds on stock cooling, each core idles between temps of 49C to 55 C (53C lets say avg). Is this normal? If not what should be the normal temperatures.
Also when I tried running Orthos on stock speeds the temps had risen to around 66C-67C on load. Again this was on stock speeds.
I haven't been able to achieve a stable overclock as of yet since whenever I saved the BIOS settings and exited the computer restarted twice and the the option to allow changing of fsb was disabled. Though the vcore voltage remained unchanged.

Now my question is that given the temperatures of my processor at stock speeds, is it possible for me to overclock my processor and if yes can someone please guide me through the changes?

I am attaching the images for default settings and temperatures at default speeds. WP_001320.jpg 888k .jpg file WP_001321.jpg 791k .jpg file WP_001322.jpg 1130k .jpg file
post #2 of 5
Thread Starter 
Maybe I cannot overclock since its stated that the p35 chipset supports maximum upto 1333 fsb which I am already running at. 333 * 4 = 1333?
Can someone guide me? I am kind of lost over here.
post #3 of 5
That is one tough chip to overclock...had a q9400 and took me months to get it stable @ 3.8(used a p45 mobo)
    
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post #4 of 5
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X99
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post #5 of 5
I just want to make sure, you have ddr2 800mhz memory correct? Otherwise that memory multiplier will need to be different again. IE if your memory is only 667 a multi of 2 giving you 800 is too much. Furthermore, if your memory isn't that great? Putting it at 800mhz if the board fluctuates the FSB, might actually push the memory over the 800mhz boundary. If your memory has some wiggle room, then this isn't a problem, but some kinds of ram are very finnicky, and will have issues when they go over their maximum printed speeds. I'm not saying this is the problem, but it COULD be if the computer still is having when you keep the CPU at stock and only change that memory multi. Again, I'm doubtful this is it, but some cheaper/value rams do not like being told to go over their speeds, even by 1mhz.

Past that, you're on the right track. OC'ing C2D is easy as cake in my opinion. Even easier than Ivy/Sandy, although thats probably just because i'm used to it. You're doing it right basically, you want to change the FSB while keeping the memory in the right speeds.

Now you probably want to try LESS of an increase. I know, I know, we all like to just jump RIGHT up and see if it works (myself included to an extent), but this is usually not a good way of going about it. You should bump that FSB by like, 25mhz MAXIMUM and try that out for a bit. The multi on that cpu is (i believe) 8, so a bump of 25mhz results in a 200mhz increase in CPU. This isn't an insane amount, but its a good starting point if you're too impatient to do 5/10mhz increments (what you SHOULD do).

Leave the voltage at stock when you do this, if its unstable, drop it down a bit. You want to find where its stable at stock voltage first. Once you know that, you can then raise both the voltage AND fsb a bit.

Furthermore, I've heard the QXXXX series is harder to OC than the other C2Ds. My C2D e6420 got over a 1ghz oc (even more than my new IB!), but, it was A) a great chip B) not a quad and C) on a somewhat decent MB for overclocking.

Another thing, when OC'ing via FSB, you add a whole nother voltage into the equation, the voltage on the FSB (or is it north bridge?). Been awhile since I did that, so I dont remember exactly what it is....but yeah. Basically the bus (or bridge?) itself can take a bit more voltage depending on your MB. Sometimes this is required, but this should be a LAST RESORT. That is, don't go out right now and up the volts by even a meager amount (usually 0.1), as this REALLY can take its toll on life expectancy of parts, more than any other voltage changes.

OC'ing these is also pretty dependent on motherboards. Some just do not have the features you need to get a stable overclock. Good luck though!

Also just a question: have you disabled C1E, EIST, etc? All those things that ramp the speeds up and down? It does end up being useful, but while attempting to establish a stable oc, its important to turn them off. Once you get it down, then you can play with saving some energy/heat on your CPU. Until you find out those sweet spots though, leave that stuff off.
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Zen
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