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FSB OC Formula?

post #1 of 22
Thread Starter 
Is there some special Formula you have to follow for increasing the FSB?

I have a E6300. Im thinking of changing my CPU cooler soon to some thing better. I set the FSB to 276mhz just to test the OC waters. The computer is running a 1.92ghz. Just wondering if theres any thing else I should know other than keeping a eye on the temps and testing for stablity.

I think I need to get a better CPU cooler soon or find out whats wrong witht he one I have because it seems to 50 C underload.
    
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post #2 of 22
Just stay below 60C with the Core 2 Duo.

I would first find a comfortable limit for that CPU. Put you RAM at the lowest speed possible (DDR2 400) and start increasing the FSB. If you run into instabilities, increase the vCore a bit. Keep an eye on temps; those Core 2 Duos can jump quite a bit in temp when you overclock them. Go as far as yuo feel comfortable with.

Then, find your RAM limits. Put the CPU at the lowest multy your mobo allows, and RAM at stock (DDR2 667). Then, increase FSB until you RAM gives up on you.

Now, since yuo know the limits of the CPU and RAM, you can derive your best settings. Let's say, your RAM can handle DDR2 700 speeds max. This means you can run RAM 1:1 with the CPU up to an FSB of 350MHz, and thus a CPU speed of 2.45GHz. Your CPU can probably handle a lot more, so putting RAM on a 3:4 divider might be a good idea.

Just test the results you get, and pick the best one. It might be that 1:1 is faster, but if you get quite a bit higher, then RAM on the divider might be better.

Good luck.
    
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post #3 of 22
Thread Starter 
Ok so this means that with a RAM only set at 667mhz it can run 1:1 with the CPU at a FSB of 333mhz?
    
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post #4 of 22
No.... it will run 1:1 with the CPU at DDR2 533 speeds (or 266MHz external).

Normally, when you set RAM at 1:1 (thus DDR 533 speeds), and then increase your FSB, the speed of the RAM will go up with it. then, when you hit and FSB of 333 or so, your RAM hits the DDR 667 speeds that's stock for this RAM.
    
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post #5 of 22
A semi-unrelated question here.. but Chozart: how are you keeping your e6600 (@ 3.51) below 60 C with the Zalman 9500.. I have one too and I hit 64-ish at even 3.4ghz.
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post #6 of 22
oh.. I had to scale back a bit. With low ambients, I stay below 60C, but with normal ambient, I run around 65C.

I am not too scared of somewhat higher temps But I do run like 3.38GHz as my 24/7 clock, and that stays around 58C. the 9500 depends heavily on air caseflow. Once you hav that under control, it's actually a pretty good cooler.
    
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post #7 of 22
Again, off topic (sorry!), what kind of caseflow do you have? Would be cool if you could explain it to me in general terms.

Ontoppic: I assume that you (MindOfChaos) know about the standard stresstesting apps and what not.. Prime95 (I like ORTHOS personally) and SuperPi 32m (and 1m for benchmarking).
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550W Antec Lian Li Logitech MX1000 
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Core 2 Duo E6600 ASUS P5B Deluxe 7600GT 2GB Corsair XMS2 DDR2 
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160GB WD SATA 3GB/s 16MB Windows XP Pro 19" NEC 90GX2 Logitech Elite 
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post #8 of 22
He means the airflow in the case. add lots of high Cfm fans basically. ( at least i think thats what he means
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post #9 of 22
Not necesarily just high CFM fans, but good flow design

I have three 120mm fans. One 38mm thick for intake in the front, and two 25mm thick ones in the back and top of the case for exhaust. The single intake pushes a little more air than the two exhaust fans combined pull out, creating a little overpressure in the case (better against dust).

This provides a nice airflow in the case.... and yes, we're taking about 80CFM intake, and 2 x 35CFM exhaust (the exhaust fans just run slow )
    
CPUMotherboardGraphicsRAM
E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
Hard DriveOptical DriveOSMonitor
250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
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N/A Corsair HX520 Coolermaster Cavalier N/A 
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CPUMotherboardGraphicsRAM
E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
Hard DriveOptical DriveOSMonitor
250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
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N/A Corsair HX520 Coolermaster Cavalier N/A 
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post #10 of 22
Thread Starter 
I set the Ram to its lowest setting. 533mhz then I start rasing the FSB. I get to about 300mhz before I lose all sign of stablity.
Its not looking promising for this Overclock.
    
CPUMotherboardGraphicsRAM
5200+ X2 2.6GHz Winsor Gigabyte 650GTX 2.5gb random brands 
Hard DriveCoolingOSMonitor
80gb Parallel Stock Win7 64bit 22" LG W2242T  
MonitorPowerCaseOther
Dell 22" Corsair VS550 Thermotake Matrix HDTV Card 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
5200+ X2 2.6GHz Winsor Gigabyte 650GTX 2.5gb random brands 
Hard DriveCoolingOSMonitor
80gb Parallel Stock Win7 64bit 22" LG W2242T  
MonitorPowerCaseOther
Dell 22" Corsair VS550 Thermotake Matrix HDTV Card 
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