I have a Dell XPS 420. I know many will say 'don't overclock oem' and the like... I'm not here for a safety discussion and if I kill my processor all the more reason to upgrade.
Anyway I did the common 'tape mod' Taping BSEL2 pin up and traced it to VCC. Doing this got me booting @ 2.99 Ghz very stable. I do have a bigger dell heat sink on there than stock and temps rarely breaking 42 C under heavy load.
So I wanted to push it further. I did a few volt mods to get Vcore up to 1.41 V from 1.28 V. Tried to overclock further with setFSB, only to find my crappy DDR2 667 MHz ram couldn't take FSB beyond 320 without starting to get errors.
So I buy 4 x 1gb DDR2 6400 chips running at 800 Mhz. They are ELPIDA CM633 1.8 V pn:EBE10UE8ACW-8G-E.
If I boot with all 4 of these at 2.4 Ghz I have no issue. The mobo sets the ram ratio to 5:6 and the FSB to 266 and the ram comes out just under 700 MHz...
If I boot with all 4 of these at 3.0 Ghz I get memory errors. Because the bios is still setting the ram ratio to 5:6, so the higher FSB is pushing the ram too hard (well outside of specs)
Thing is if I boot with 667 MHz ram at 3.0 Ghz (hardware mod) the ram ratio gets set 1:1. Then I can use FSB to up things, and the ram responds reasonably well to its limit. So I'm thinking can I just flash my 800 ram with 667 timings, to get it to boot in a 1:1 ratio @ 3.0 Ghz. Then use setFSB to up to 400 giving me 3.6 Ghz clockspeed and ram at 800 Mhz.
Thing is I don't know much about flashing ram. I have spdtools and the demo of Thaiphoon Burner. I have found Thaiphoon has like 8 version of my ram in there built in browser, the demo won't let me flash them. With spdtools I have no idea to change the timings from 800 Mhz 6-6-6-18 to 667 Mhz 5-5-5-15?
Any links that can give me the rundown on spdtools, some expert here that can lend some advice or any help would be appreciated!