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Using Two PSUs....one to power CPU other for GPU...Possible?

post #1 of 8
Thread Starter 
we all know by now that we can use two PSU's....... but is it safe to use one for the CPU and use a seperate one for the GPU?? I have read that it is not recommended...any suggestions?? Is is possible without damaging an components?
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post #2 of 8
You need to worry about load balancing the 3.3v+5v with the 12v line. If you don't put enough load on the 3.3v+5v rail, many older PSUs will not provide enough current or poor regulation on the 12v line
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post #3 of 8
Thread Starter 
ok but is it safe to do? and how would you balance the load?
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post #4 of 8
Quote:
Originally Posted by soumalidon View Post
ok but is it safe to do? and how would you balance the load?
If there is a load balancing issue, then it would not be safe. Your 12v voltage may fall out of 5% spec or not provide enough power. To load balance, add a load to your 3.3+5v rails.
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
If there is a load balancing issue, then it would not be safe. Your 12v voltage may fall out of 5% spec or not provide enough power. To load balance, add a load to your 3.3+5v rails.

and one other thing......the second PSU will be on for a few seconds until i switch off the UPS....is this ok or would it have to be off at the same time as the PSU connected to the MB
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post #6 of 8
Quote:
Originally Posted by soumalidon View Post
and one other thing......the second PSU will be on for a few seconds until i switch off the UPS....is this ok or would it have to be off at the same time as the PSU connected to the MB
You can mod the second PSU to turn on with the primary PSU. I believe there is a guide under the stickies.
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Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
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Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
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post #7 of 8
you'll need to get the second PSU's main power cable to hook up 1 wire to one of the ones on the mobo. i don't really want to explain it, but there are adaptors for it.
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post #8 of 8
You cross the green motherboard wire with any of the black motherboard wires. this can be done with a paper clip or buy a 7 dollar adapter, I would recommend the paper clip.

-Note, the green is a control wire, and the black ones are the ground wires. Use this tick on the PSU powering the graphics cards, do not attempt to plug this "jump-started" motherboard connector into a motherboard.
    
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