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Need help overclocking to 3.5GHz

Last response: in Overclocking
March 4, 2010 3:53:23 PM

Hello i got a athlon x4 620 with a biostar ta790gx a3+, the cpu is running very happy at 3.25Ghz at this time with only 1.328v (i think i got a good chip cause it came with stock volts at 1.260 :D ), My HT is perfect on 2000, my DDR3 is running at its rated speed of 1333MHz and my NB is at 2500.

I got a aftermarket cooler (Coolermaster Hyper TX3) and i really want to push this athlon to 3.5Ghz problem is though, as soon as i take the fsb to 260 i can boot but my screen is fuzzing with weird patterns and colours, so i upped the vcore to 1.360 and still done it, so i upped the NB with 0.20v and still done it. (Note i did drop the ram speed and the HT to compensate.)

Its stable at 3.25Ghz (so said prime95 for 7 hours, LinX at 150 passes, OCCT linpack for 1 hour and OCCT for 4 hours) but cant go higher, is there anything im missing? anything i can try? (note that i cant change my NB multi cause bios dont give option.)

(current temps are 49*c at full load under Linpack, 46*c under prime95)

More about : overclocking 5ghz

a b À AMD
a c 295 K Overclocking
March 4, 2010 7:36:21 PM

Hi newcomer and welcome to the Tom's hardware forum.

The 620 is a processor with lock multiplier, I think that you can't get more that 3.2GHz or 3.3GHz.
a b À AMD
a b K Overclocking
March 5, 2010 7:04:35 AM

I'd try dropping the northbridge multiplier, it may not like going over 2500 regardless of how much voltage you throw at it.