For my work computer I though a 805D would be a nice cheap upgrade with a possible decent overclock. I bought the cpu and a cheap Asus p5p 800Se, that uses ddr and apg, which I thought was great as I could use my old stuff. I have an Asetek waterchiller to cool it with.
Anyway as I tested it, I found it overclocks fairly easy to 3.6 ghz in windows, but it is never stable at full load except at its original speed and since I run analyses that taxes the cpu 100 % I can't overclock at all. I'm not shure but I think it is due to the cheap mobo that cannot supply the cpu with the enough juice (though that would mean it can't run any faster cpus so that's perhaps not probable). The vcore, measured in Asusprobe, fluctuates depending on load. At 50% load the vcore goes down a little, but when it is under 100% load, vcore always goes down to 1.144-1.2 V after a few minutes regardless of what vcore that was selected in the bios and regardless of what speed the cpu is running at. Is that really normal? All other voltages (+12, +5, and +3.3) are stable. I have a Zalman 400W psu and it runs the pump, three 120 mm and one 80 mm fans running at low speed, an old geforce3 ti200 card, one hd, a cdrw and two mice. That should't be too much for a good 400W psu, should it? The temps are low, at 2.66 ghz it is around 40C at full load and goes up to at most 68C at full load 3.6 ghz.
My memory sticks are not the same (one Twinmos 512 mb 2.5 and one Apacher 512 mb 2.5) and perhaps can't run in dual mode, but running with just one stick doesn't change anything and memtest doesn't give any errors.
Edit: I just checked my psu and it is the older 400-APF that only has 15A on the +12V line could this be the problem? The specs are: +3v 28A +5v 40A (together 235 W), 12V 15A (180W).
Anyway as I tested it, I found it overclocks fairly easy to 3.6 ghz in windows, but it is never stable at full load except at its original speed and since I run analyses that taxes the cpu 100 % I can't overclock at all. I'm not shure but I think it is due to the cheap mobo that cannot supply the cpu with the enough juice (though that would mean it can't run any faster cpus so that's perhaps not probable). The vcore, measured in Asusprobe, fluctuates depending on load. At 50% load the vcore goes down a little, but when it is under 100% load, vcore always goes down to 1.144-1.2 V after a few minutes regardless of what vcore that was selected in the bios and regardless of what speed the cpu is running at. Is that really normal? All other voltages (+12, +5, and +3.3) are stable. I have a Zalman 400W psu and it runs the pump, three 120 mm and one 80 mm fans running at low speed, an old geforce3 ti200 card, one hd, a cdrw and two mice. That should't be too much for a good 400W psu, should it? The temps are low, at 2.66 ghz it is around 40C at full load and goes up to at most 68C at full load 3.6 ghz.
My memory sticks are not the same (one Twinmos 512 mb 2.5 and one Apacher 512 mb 2.5) and perhaps can't run in dual mode, but running with just one stick doesn't change anything and memtest doesn't give any errors.
Edit: I just checked my psu and it is the older 400-APF that only has 15A on the +12V line could this be the problem? The specs are: +3v 28A +5v 40A (together 235 W), 12V 15A (180W).