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prime errors with q9550 overclocking

Last response: in CPUs
September 22, 2008 1:36:29 AM

i just bought a q9550 from newegg to replace my e6400, and i cant get it to overclock more then 3ghz. i am pretty noobish when it comes to oc ing, but i was able to get my e6400 to 2.8. when i try to go past 3ghz with the q9550 the computer wont even start. even at 3ghz i get errors and blue screens during heavy gaming. during a prime95 test i get errors on three of the cores. i have tried uping the voltage by small increments and it doesn't change anything.
could it be my board? or a bad cpu? or am i just missing something obvious

my board is a ga-p35-ds3l, ram 2x2gb gskill ddr2 1066
September 22, 2008 7:04:46 AM

What voltage are you setting with Q9550 @ 3.0Ghz? You should obtain that clockspeed relatively easily. You should try 1.25~1.3V for around 3.0Ghz.

Another thing you might to do is make sure your RAM is running at default speed. If that still doesn't work, you should look into increase your northbridge voltage a little bit.
September 22, 2008 4:13:18 PM

ok ill try that, thanks
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September 22, 2008 6:05:09 PM

i originally had the voltages set to auto, but i then changed the vcore to 1.3v i let the ram stay at auto and its still failing prime95 tests at about 1min
September 22, 2008 7:24:28 PM

Check your ram speed and timings. Make sure they're within limits. Use CPU-Z. If not adjust the multiplier. This is usually what happens when you are new to overclocking.
September 22, 2008 11:19:01 PM

what would be good limits for the ram timing and speed in cpuz dram freq :564 cl:5.0 tRCD: 8 rRP8 tRAS 21
September 23, 2008 12:20:06 AM

Why is your RAM operating at 1128Mhz? You should go to BIOS, and set your RAM at 1066Mhz, with timing 5-5-5-15. On the other hand, set the RAM voltage to manufacturer specified value (usually 2.1V).
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September 23, 2008 2:40:25 AM

I'm betting it's RAM - my friend's 9550 hit 3.3 on 1.13V fairly easily, and 3.72 on 1.275V. Unless you got one heck of a horrible overclocker, 1.3V should be enough for WAY more than just 3GHz.
September 23, 2008 3:37:00 AM

yeah it was the ram, iv got it stable at 3ghz. thanks alot guys