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Brick wall from FSB 280 to 281? E5200

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January 9, 2010 4:30:42 PM

My E5200 ran pretty good @280 w/12 mutliplier for my first oc attempt. As I was mimicing Toms May budget build, I left it @ 3.50ghz for a couple days as I loaded all my software. I was thinking I got a decent chip as I was able to squeeze my voltage down to under 1.20 with no issues. Temps at max were maybe 48C on the cores. However, when I pushed it a bit last nite to 281, it would not even post. Ran the voltage slowly up to 1.37 (!!) and still nothing. Set everything back to my original OC specs and she's sweet again. My ? is, in everything I've been reading, I don't recall people failing to post with such a small incremental increase, especially that she was so stable to begin with. Is something maybe set or hardcoded into my Bios that is doing this to 'protect' my chip? I/m running a G41 chipset and a GiGaBT MB. Sorry if this is as stupid as my last post! thnks....
January 9, 2010 8:59:20 PM

try disabling legacy USB support or USB storage...

also try 333FSB and backing down the multi

if it works with a lower multi and a higher FSB then you either need more voltage or you are at the max your chip can do... also you might mess with chipset voltages and/or reference voltages
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January 9, 2010 9:54:06 PM

^good suggestions


also, are you running Intel Speedstep? if so, disable that and give your OC a try.. If it doesnt work, thats quite a brick wall you've hit m8. =\
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January 9, 2010 10:19:53 PM

rambo117 said:
^good suggestions


also, are you running Intel Speedstep? if so, disable that and give your OC a try.. If it doesnt work, thats quite a brick wall you've hit m8. =\


sometimes its more of a FSB hole than a FSB wall
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a b å Intel
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January 10, 2010 1:31:57 PM

Being a fan of Gigabyte motherboards, I bet you are inadvertently overclocking your memory and that is limiting your CPU overclock.

Check your system memory multiplier. The SPD value is probably set to AUTO. Change it to manual, then when the multipliers come up, set it to 2.00.

At this point, the mem freq should be twice the FSB. Once it shows twice the FSB, continue to try to push the FSB up.

I was able to reach 3.78 GHz (315 MHz X 12) at around 1.35 volts. Then I hit the proverbial brick wall. My E5200 has a pretty high VID (1.28 volts). :( 
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January 10, 2010 3:42:34 PM

It was set to auto. When I went to change it, it only gane me a mutiplier of 4.0 (not 2). It si a DDDR3 board if it matter. Thanks and looking forward to your answer.
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January 12, 2010 12:10:08 PM

Damn, I can't crack this one. I really feel it has to be a MB setting I'm missing. This PC runs so smooth and cool at 3.50, low voltage and all. Push to 3.51 and she don't want to come out and play.

If I really can't squeeze anymore, is the MB or the chip? thanks..
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January 12, 2010 12:57:32 PM

it's the memory divider look that up for your board and see. where you can run memory slower than the cpu with a small performance hit, and if it is that issue, either stick with it or get better rated memory.
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January 12, 2010 1:37:59 PM

intel chipsets dont have a divider... nvidia chipsets do
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January 12, 2010 2:59:34 PM

I have DDR3 memory.
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a b å Intel
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January 12, 2010 4:44:41 PM

OP, I was assuming DDR2 memory.

oc_4life said:
intel chipsets dont have a divider... nvidia chipsets do

Not expliciitly, but you can select mem clock freqs that will give you the same results. For instance, an FSB of 400 MHz with a memclock freq of 800 MHz gives an FSB:RAM clock ratio of 1:1. In other words the memory is running sychronomously with the CPU.

If for some reason, you run the memory at 400 MHz, that works out to a 2:1 FSB:RAM clock ratio or a divider of two.
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January 14, 2010 6:31:35 PM

oc_4life said:
intel chipsets dont have a divider... nvidia chipsets do



no intel do, just they are labeled differently and not as easy to understand to me at the time.

with my i7's bios, there is a setting to set the memory speed, I was like cool and sets the thing to 1600 level speed, and then increased the base clock to 200 and it didn't boot

then i was told what I was changing was basically what a divider did, and thus the setting was for if you wanted only to OC the ram and put a smaller divider in, and what I did was running the memory wayyyy out of it's spec and thus wound not work

what I needed was to set the memory to the setting called DDR3-800 (I think, but it was lower than the default 1033 or w/e) and then ramp up the base clock to 200, that way, the memory would run at DDR3-1600 and not at some crazy speeds that I had it going at
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January 24, 2010 2:34:02 PM

Still no luck. I think this MB doesn't allow it. That being said, I am happy with 3.50 Ghz and a GTS 250 card that I can push up to an 835 gpu core speed. Nothing ever drops below 35 FPS @ 1650x1050.
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