my mistake for that.

blindbox, perhaps you have hit the weakness of ST56F's multi-rail (it's on dual-rail) setup.

if that's the case then nothing wrong with the PSU, just that you have to find out how to not go beyond 20A on either rails.

Yeah i have to agree with goldfries you might have overdone your rails
If you hav a friend with a better PSU borrow and run a full oc and stress test if you have the choice

Idk, I'll ask for an RMA anyway. I would've opted for Corsair VX550W if I could, but stock wasn't available.

Btw, didn't I mention it was pretty cold on an open-air setup, to answer herojack41's question? One of the components must have been not mounted properly, is my guess.

Well, on to my calculations. A rail has 240W(20A x 12v). The processor takes 95W, the graphic card takes 75W(pci-e 1.x specs). That's 170W. The board itself takes 30W. Bear in mind that all of this calculation is an overestimation. Now see, I have 40 watts extra. I doubt overclocking is going to make any effect.

Hey now, I have an idea, thanks. I might as well try those molex to 6-pins given. I still have time to test stuff out. Well, time to split the rails. I'll report again tomorrow(gimme a break, lol).


Anyone has my PSU and does overclocking to such a point? I need user experience here. It's more valuable than theories.



This post has been edited by blindbox: Apr 27 2009, 06:21 PM

well.....i does not hav any idea if u r still thinking that da silverstone psu hav problem.
although u r on super cold enviroment....u overloaded it,cooling will not help much it still generating heat.

well,u could try and send it back to warranty.

u hav hit da limit of da psu bro,u could ignore my comment.

I don't think with TS's spec it will hit the PSU's limit.

You can try if you want but, if you make the PSU fan to stop working, the pc will shut down on load and you'll have to wait a few minutes before you can start the pc again . Anyway, I'll confirm the rail issue first anyway. Time to read the manual to know which wire goes to which rail.

This post has been edited by blindbox: Apr 27 2009, 08:37 PM

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

juz to point out... is it normal for the PSU fan to run at constant rpm regardless of load...?

I get a lot of crashes OCing everything with this power supply using 8800GT. It's stable when I do a mild OC on just the processor.

You would imagine how much less you can OC with 4890 that requires more power than 8800GT.