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Some motherboards are jumperless and have settings designed for overclocking. Asus motherboards for example, are great for overclocking. COOLING THE CPU, MOTHERBOARD, CHIPSET AND MEMORY ARE VERY IMPORTANT! One other thing that can cause unknown reboots....if your power supply can't give enough voltage to support the demands of overclocking....
Yep Buzz, your're right, lots of MB's are jumperless now days (well, near jumperless). Clearing the cmos has always been done with a jumper, along with basic functions like switching your audio between front & rear panels.
ASUS motherboards are ok for ocing, but the bios on their boards are not that oc friendly. The boards cut out at moderate oc's (like 230 FSB -
AMD Athlon 64 Socket 754 Motherboard Roundup). ASUS boards are one of the best at factory speeds and are really hard to beat.
Asus is one of the more prestigious brands, with a large group of loyal followers. The price might be a bit higher, but for your money get a very feature rich, robust - and often overclockable - motherboard. The overclocking community is not their primary market, which is why their bios and tools are set for user friendliness, not overclocking. Generally their motherboards are tweaked right out of the box, which is great for people wanting the most out of their computer, but don't want to mess around with the settings. Mostly this doesn't leave much headroom for overclocking though.
If you really want to oc, nothing comes close to a DFI board. They are the most feature rich boards on the planet. No other board has come close to beating them in ocing, especially if you have a 64 Bit processor which eliminates the need of a Front Side Bus (FSB).
(DFI LANParty UT nF3-250Gb: Overclocker's Dream)
DFI (Design For Innovation) surprised the overclocking community by building one of the best overclocking NF2 motherboards, pushing Abit's NF7-S from the throne. Overclocking the NF3 chipset has proven to be easier, but no NF3 250Gb motherboard has proven to be a definite winner. The DFI NF3 250Gb continues this trend and delivers excellent overclockability once more, while keeping this motherboard interesting feature and price wise too. The big drawback is the time it took DFI to deliver this motherboard to the masses.
Abit boards are the 2nd best overclocking wise.
Your power supply is very important when ocing. 400 watts is normally enough to get the job done. 500 watts or better will give you more stability (power wise).
My Rig & Temps - Built from the ground up:
Windows XP (Same copy since August 2001

)
AMD Athlon 64 Processor 3700+ ClawHammer (1MB L2 Cache) (purchased January 2005 $314.00 - IO Software Local Store)
DFI LANPARTY UT nF3 250Gb (purchased Febuary 2005 $107.00 - GameVE Online)
ATI Radeon 9700 Pro 128MB (purchased January 2003 $297.00 - Forgot the online store

Time for another card.)
Kingston Technology 512MB x 2 Memory (purchased January 2004 $80.00 - IO Software Local Store - Need better memory)
Lite-On (DVD/CD-RW Combo) SOHC - 5232K (Purchased Febuary 2005 $40.00 - IO Software Local Store)
Lite-On (CD-RW) LTR-52327S (Purchased January 2003 $35.00 - IO Software Local Store)
Seagate Barracuda 250GB S-ATA RAID 7200RPM 8MB Cache (Purchased Febuary 2005 $170.00 - IO Software Local Store)
IBM Deskstar 40GB Ultra-ATA 100 7200RPM 2MB Cache (purchased January 2003 $114.00 - IO Software Local Store)
Logitech Z-5500 5.1 Digital (purchased Febaury 2005 $278.00 - Newegg Online)
Logisys Assembled Arcrylic Clear Case w/5 80mm case fans (purchased Febuary 2005 $68.00 - GameVE)
Thermaltake Sonic Tower Heatpipe Cooling (purchased April 2005 $52.99 - FrozenCPU)
Gigantic unit! (Ditched the water cooling

)
Panaflo 120x38mm Ultra High Speed Cooling Fan - 115 CFM (purchased April 2005 $16.99 - FrozenCPU) Mounted on the Sonic Tower.
Logisys Glacier Aluminum & Arcrylic Moded Gaming 500 Watt Power Supply (purchased Febuary 2005 $39.00 - GameVE)
Idle Temps Below: Under full load, temperatures max out around 46 degrees celsius. Overclocked temps (cpu core 1.55v, chipset 1.70v, ram 2.90v) under full load reach around 50 degrees celsius.