I just recently upgraded my 3000+ to a 4200+ socket 939 and was running the 3000+ with an OC'ed FSB at 250, effectively making the CPU from 1.8 to roughtly 2.25 GHz guestimate. I have 2GIgs of PC3500 and to get it run stable with it i had to up the Dram Voltage by .02 volts. Now that i installed the 4200+ i can't get even an extra 15 Mhz on the FSB with it out it locking up and not booting past the POST. Is it just that this chip is not a good OCing candidate? or is there something i'm not getting.

Can't help without knowing your system specs....especially the board. What have you attempted so far?

i've down the Hypertransport bus to 3X, i've increased Dram voltage slightly, Increased CPU VCORE slightly, i've set my Ram timings higher. It was giving me the same issue with my old processor, increasing the Dram voltage fixed it, but no such luck with the new one... i can't get it to clock past 225 FSB. I'm Running a DFI nF4 board, with 2gig corsair(can't remember the timings exactly) 4200+ Dual core socket939

When you upgraded,how did you do it?

Clean install?

Or did you just put the new dualcore in?

Tt Lanfire
MSI K8N Diamond
X2 4600+@234x12=2.8ghz 1:1
1GB PC3200/4400
OCZ Powerstream 520w
6600GT
WDCaviar 160gb sata x2

Yea it was a clean install i reset everything in the bios back to factory and then went from there.

Did you 'load optimised defaults 1st?

Tt Lanfire
MSI K8N Diamond
X2 4600+@234x12=2.8ghz 1:1
1GB PC3200/4400
OCZ Powerstream 520w
6600GT
WDCaviar 160gb sata x2

no, just default settings and started tweaking from there