C566@850 at 1.75v stable for the longest time using a Golden Orb (Asus P3B-F, Asus s370DL slotket). Anything above 100Mhz bus would not boot. Tried a few heatsinks and found the GORB to have the best contact with the CPU slug and good heat dissipation...until now!
Splurged a little and bought an Alpha PEP66 with Delta 38CFM 60x25mm fan (6000 RPM). The whole setup is a monster though only one DIMM slot is compromised. Oh my what a difference! At first I had to modify the sink a bit by sanding down the plastic feet so that the copper plate just makes contact with the CPU slug without tension. For some reason, the PEP66 was designed to have a rather large gap (to be filled in with thermal paste) to the CPU slug before tensioning down the clip. After sanding, a thin layer of thermal paste and now running @892 (1.8v) totally stable. In fact I am running BURNBX in the background as I write this. Before with my previous setup, the temps running BURNBX (not the other BURN** progs) were soaring to 70C+. Here I am maxing out at 55C...all other BURN** programs and Prime95 only heat it up to 45C. AMAZING difference! I suspect that the BX chipset itself is being cooled well...the design of the Alpha creates a strong updraft directly about the BX chipset. CPU heat is drawn up and away from the motherboard instead of across toward the DIMMS. This makes for most efficient cooling.
I HIGHLY recommend this sink/fan combo for the best in slotket cooling. Yes the fan is a bit noisy but bearable.
Splurged a little and bought an Alpha PEP66 with Delta 38CFM 60x25mm fan (6000 RPM). The whole setup is a monster though only one DIMM slot is compromised. Oh my what a difference! At first I had to modify the sink a bit by sanding down the plastic feet so that the copper plate just makes contact with the CPU slug without tension. For some reason, the PEP66 was designed to have a rather large gap (to be filled in with thermal paste) to the CPU slug before tensioning down the clip. After sanding, a thin layer of thermal paste and now running @892 (1.8v) totally stable. In fact I am running BURNBX in the background as I write this. Before with my previous setup, the temps running BURNBX (not the other BURN** progs) were soaring to 70C+. Here I am maxing out at 55C...all other BURN** programs and Prime95 only heat it up to 45C. AMAZING difference! I suspect that the BX chipset itself is being cooled well...the design of the Alpha creates a strong updraft directly about the BX chipset. CPU heat is drawn up and away from the motherboard instead of across toward the DIMMS. This makes for most efficient cooling.
I HIGHLY recommend this sink/fan combo for the best in slotket cooling. Yes the fan is a bit noisy but bearable.
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