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looking at the hw list you propose reusing, you have a lot more components than the systems I measured the power consumption on

each hd will draw something like 20W
the 6600GT will draw more than either graphics card I used
not sure about the IBM RAID card - there are so many versions of this I can't work out which one you have - some have their own CPU's, RAM and batteries, some are just an add on processor and RAM that reuse an on board Adaptec or LSI SCSI controller

but as is pointed out - you are still going to end up with a power draw in excess of 150W with your HW and the most important thing to remember is that the PSU needs to supply enough current on EACH voltage for your power draw - not just a total Wattage, There are several discussion on this in the forums around, Also it's not the running current that is the problem so much as the startup current starting 3 motors (in the drives) and all the fans at once will likely pull a significant spike of current (that's why the big storage vendors start drives a few at a time under the control of a dedicated processor instead of all at once)

Also I've seen various comments saying that higher powered silent PSU's running well within their ratings are able to run cooler and quieter than smaller PSU's running closer to their maximum ratings.

Regards

Mark

<blockquote data-quote="markr" data-source="post: 66945" data-attributes="member: 18947">looking at the hw list you propose reusing, you have a lot more components than the systems I measured the power consumption oneach hd will draw something like 20Wthe 6600GT will draw more than either graphics card I usednot sure about the IBM RAID card - there are so many versions of this I can't work out which one you have - some have their own CPU's, RAM and batteries, some are just an add on processor and RAM that reuse an on board Adaptec or LSI SCSI controllerbut as is pointed out - you are still going to end up with a power draw in excess of 150W with your HW and the most important thing to remember is that the PSU needs to supply enough current on EACH voltage for your power draw - not just a total Wattage, There are several discussion on this in the forums around, Also it's not the running current that is the problem so much as the startup current starting 3 motors (in the drives) and all the fans at once will likely pull a significant spike of current (that's why the big storage vendors start drives a few at a time under the control of a dedicated processor instead of all at once)Also I've seen various comments saying that higher powered silent PSU's running well within their ratings are able to run cooler and quieter than smaller PSU's running closer to their maximum ratings.&nbsp;&nbsp; RegardsMark</blockquote>

[QUOTE="markr, post: 66945, member: 18947"] looking at the hw list you propose reusing, you have a lot more components than the systems I measured the power consumption on each hd will draw something like 20W the 6600GT will draw more than either graphics card I used not sure about the IBM RAID card - there are so many versions of this I can't work out which one you have - some have their own CPU's, RAM and batteries, some are just an add on processor and RAM that reuse an on board Adaptec or LSI SCSI controller but as is pointed out - you are still going to end up with a power draw in excess of 150W with your HW and the most important thing to remember is that the PSU needs to supply enough current on EACH voltage for your power draw - not just a total Wattage, There are several discussion on this in the forums around, Also it's not the running current that is the problem so much as the startup current starting 3 motors (in the drives) and all the fans at once will likely pull a significant spike of current (that's why the big storage vendors start drives a few at a time under the control of a dedicated processor instead of all at once) Also I've seen various comments saying that higher powered silent PSU's running well within their ratings are able to run cooler and quieter than smaller PSU's running closer to their maximum ratings. Regards Mark [/QUOTE]