I would not recomment the smart power series, especially if intent is for good overclokcing results... tho it is not nec a bad psu...
The TruePower series are the premium line for Antec.
I have the following...
Lian Li PC-60plus Black Aluminum Case (w/TR-3B Black Thermometer/Fan Controller 3.5” bay)
Opteron 175 (2x 2.42 GHz, 2MB cache, Socket 939, .09 micron, E6 stepping, OSA175DAA6CD)
ThermalTake BigWaterSE 12cm liquid cooling system complete kit
Asus A8R-MVP Motherboard (ATI Radeon Xpress 200 CrossFire, socket 939, SATA2)
HiS X1800XT Graphics Card (625 MHz/700 MHz OC core/1500 Mhz/1600 MHz OC mem, Dual DL-DVI VIVO 512 MB PCIe)
ATI TV Theater 550 PRO Tuner (PCI TV and FM Tuner)
4x 512MB Corsair Micro Xpert DDR RAM (2-3-3-8-2T (spd 2-2-2-5-1T) TwinXP 1024-3200XL)
2x 74gig Western Digital Raptor Hard Drives RAID-0 (WD740GD RAID0 150gig Boot Drive)
2x 250gig Western Digital Caviar SE16 Hard Drives (WD2500KS storage and data)
Plextor 716AL Black 16x DVD/CD Burner (IDE slot loading type)
Antec TP-II 550 Power Supply (550 Watt ATX12V v2.0 PSU)
Dell 2405FPW 24-inch LCD Monitor (UltraSharp Wide Aspect Flat Panel Display)
Logitech G-15 Gaming Keyboard
Logitech Cordless Optical TrackMan
Case Fans (SilenX 120mm intake, Adda 120mm exhaust blower, SilenX 92mm exhaust and SilenX 80mm Fan)
Anyway, the fastest stable overclock I can reach is 2680; I seem to hit a brick wall at around 2700 MHz.
Whether I use 11x250 or 10x270 or even 10.5x260 it fails to boot, but if I back it down 5MHz things work pretty good, and it makes no difference at settings CAS 2.5 or 3, using 3, 3, 8, 3, or with just 2 stick or RAM; either way, around 2680 is my overclock limit. But this system is quick and stable; I keep it normally at 2420 MHz (11x220 at 2, 2, 6, 2) 2.8 volts for now. I am pretty sure the overclock limit is the processor and not the memory, but would have liked to see top out well better than a 20% stable overclock with this system, considering the components.
It does hit pretty high according to FutureMark’s results ~ 4,935 3DMarks06 and 9,881 marks in 3DMark05.
I am looking at upgrading motherboard to the A8R32-MVP with the FSP Epsilon 700watt PSU to see if I can o/c higher, since currently, overclocking at system max, the 5 and 3.3 volt starts dropping a little low due too pushing limits of current 550watt PSU... I hope that it is one reason I can not break 2.7GHz