Hmm... interesting...

I've encounter few cases regarding this PSU...
and i've to say that ST56F isn't as good as i though...
According to ST56F Specs... the PSU should be able to supply power continuously 560W@40C...
Typical operating temp of any PSU is around 40~50C...
What i can say here is that... TS's PSU rating is degrading because of temperature factor....
If ST56F cooling fan is unable to maintain the 40C temp the PSU capacity should less than 560W...

TS case --> higher load...more heat... increase in temperature... "cooling isnt adequate"--> PSU capacity degradation... PSU hits its limit... ---> overload ---> automatic system shutdown (protection mechanism)

I'm not going to say here that ST56F isnt sufficient for TS rig...because it is enough...
According to ST56F GPU Support list it supports 9800GTX and 4850 CF....

This post has been edited by campsol2k: Apr 27 2009, 06:18 AM

Theoritically, your calculation was underestimate...
Total combined 12V rail is 40A.. so its 480W
Here's my estimation
CPU- ~95W...once overclock..,+65W or maybe more= 160W
GPU- ~180W...once overclock.. +10~20W = 200W
Mobo- 10~15W
Cooling fans- 0.5A~1.5A = 6W~18W
HD & Optical are negligible coz.. they were idle...
Total load on 12V rail with heavy OC can reach 400W++

According to the calculation... ST56F theoretically can power up your rig under load...
however, you put a lot of stress on your 12V rail and maybe reach its limit under circumstances that PSU can't deliver 40A@12V....
all i can say here is your ST56F isnt good enough/faulty or overheating (according to your theory)...
it failed to perform what it supposed to deliver....

This post has been edited by campsol2k: Apr 29 2009, 12:13 AM