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The Pentium D 805 was cooled with a Thermaltake Sonic Tower equipped with two 120mm fans, the Celeron D 356 ran a lot cooler and stock cooling was enough for our overclocking adventure.



That the Pentium D 805 gets hot when overclocked is not news, in combination with only 3-pashed power circuit from the Asus P5LD2 (instead of a better 4-pashed circuit) the backside of the motherboard got so hot that it burned through foam lying underneath:



Overclocking the Pentium D 805

Running at stock speeds the 805 only needs ~1.35v vcore to remain stable; At these settings the DDR2 memory is running with ½ divider at 266Mhz CL3-2-2-4 using 1.8v voltage setting the BIOS.



Increasing the FSB the CPU overclocks easily to 3.3Ghz without touching CPU vcore settings, the DDR2 is still running with ½ divider and gets a bump to 2.1v.



At 781Mhz Front Speed Bus the CPU is at 3.9Ghz, a small bump to 1.5v vcore was needed for this, the memory is running on 3/5 divider.



The system started to act up once you near the 200Mhz FSB mark (800Mhz quad pumped), at 3.9Ghz it was rock stable, 4Ghz (the limit of the system is seemed) was reached but not 100% stable. It turns out once you disable SATA and hook up a PATA hard drive the system ran successfully at 4.2Ghz



Having only an older 5400rpm PATA drive available the 32Mb SuperPi test was lower than expected. Since disabling SATA is not a feasible solution we only compared the benchmark scores of the 805 clocked to maximum 3.9Ghz.