jhanschu : ...Does anyone know what a good OC on say the X3 710 would be? It's about $40 cheaper than the 720BE and if it could even hit close to 3.0 I would consider it a decent buy.
I put together X3 720 BE system for video project and my own upgrade from 3GHz P4/800/512 and had same curiosity as you. My 126.5% overclock ratio results might be similar for X3 710. At non-BE locked setting of 14X multiplier I was error-free in Prime95 (longest run was 6+ hours) at CoreSpeed:3542 (1.4V), BusSpeed:253, HTLink:2024 (HT/NB=1600 in BIOS). That ran my DDR2-1066 as only 1012MHz, but acceptable.
My Corsair RAM is sold as DDR2-1066 but neither pair overclocked well above 1080. It is apparently DDR2-800 tested to perform at 1066 speed by increasing 1.8V RAM voltage to 2.1V, as per Corsair. All timings had to be set manually in my BIOS because reported SPD is DDR2-800. My BIOS is now set to DDR2-800 but with DDR2-1066 timings 5/5/5/15/2T/22 for the "overclock". I bought them because it was the least expensive brand DDR2-1066 sold by Newegg on Biostar's compatibility list, and Corsair has always fared well in past system builds.
Testing multiplier-only overclock at standard BusSpeed:200, HTLink:2000, DDR2:800 my CPU maxed out at 3500MHz (200x17.5) stable. I received an error from 3rd core about 3 hours into Prime95 torture test using 3600MHz (200x18) setting. Fastest I was able to boot and run AOD benchmarks was CoreSpeed:3762 (1.425V), Multiplier:x18.0. BusSpeed:209, HTLink:1881, DDR2:1113 (2.25V). I never bothered to exceed rated core voltage of 1.425V in any test. This is all with AMD stock cooling, mind you.
I failed to check if my CPU was from the 0904 production batch before installation but this motherboard will not even post with ACC "Auto" enabled for unlocking 4th core. BIOS is CM113.BS that was already loaded with motherboard. I'm pretty satisfied and this system has far surpassed the various Core 2 Duo E8xxx systems we used at work. I want Intel to have competition so I support/build AMD systems for myself and customers every chance I get. I'm not into gaming/overclocking and the mATX case I chose has limits, so I planned to be conservative from the beginning.
My current settings are: CoreSpeed:3458 (1.3875V), Multiplier:x13.0, BusSpeed:266, HTLink:1862, DDR2:1066 (2.15V). Nothing more than warm to the touch except my SCSI drive which has always felt moderately hot.
Corsair CMPSU-550VX (many long cables, bad choice for mATX)
Biostar TA790GX XE AM2+ mATX
AMD Phenom II X3 720 BE AM3
4GB Corsair TWIN2X4096-8500C5D (Dominator heatsink barely clears in DIMM1/2)
4GB Corsair TWIN2X4096-8500C5 (low-profile clears hard drive, DIMM3/4)
Sapphire Radeon HD 3870 (100225L)
Western Digital Black 500GB (WD5001AALS)
Maxtor Atlas 10K IV 146GB (on LSI U160 adapter)
Lite-On LH-20A1L DVDRW
SIIG Firewire 400 Home DV Kit