So I got this brand new rig with these specs.

Phenom II x3 720BE 2.8 GHz
MSI KA-790GX (sucky board, but nvm that)
WD 640GB
Sapphire ATI Radeon HD 4890
2x 2GB Corsair gaming ram(it costs the same as KVR that time)

I OCed my phenom II to 3.2 GHz at 1.3125 volts. I start doing full load tests, no crashes. Then I start increasing my HD 4890 volt to 1.4v and OC that as well. I start another full load test, it crashes and I had to wait a few minutes before I can start my pc back (typical psu overheating symptom). I can also crash the system by sending in 1.4 volts to my phenom II at 3.5 GHz btw(despite being stable).

Should I send this PSU back to RMA, or try an open-air system first to see whether my airflow sucks or not? Anyone has experience? I need to make a few comparisons. Sigh, I wish the fan would rev higher lol.

UPDATE: Tested the PSU open-air. Nada, system shuts down and I have to wait a minute before I can start the PC again at full load oc still. I'm not even close to the full potential of my chip arghh!

EDIT: A reminder, the psu is silverstone strider st56F

This post has been edited by blindbox: Apr 27 2009, 01:48 PM

If you planned on OCing why din you just opt for a better wattage PSU?
st56F should be able to withstand this.

Exactly, it's already a better PSU. The problem isn't overload. It's overheat.

if u change all setting to default , did this prob occur?

If brand new you should be able to replace PSU one to one but i doubt it, but you better not say your OCing it aite

Nope. No problems at stock. Problem comes when the PSU is pushed.

I'll post my results tomorrow, I'll do an open-air test, with fresh air for the PSU. If it still overheats, I think I'll RMA it. One to one exchange... I'll see what the shop allows, thanks for the tips.

Seems like nobody here has the same experience as mine.


EDIT: Well, one to one exchange is not possible after more than a week(it's now 8 days, sucks).

This post has been edited by blindbox: Apr 26 2009, 10:10 PM

I dont use ure psu bro but i know it can withstand it, my friend used to OC his proc with this PSU but added a blower to promore to stability. But if you ask me a better PSU is worry free like mine.... i have ample of power for my needs... no need to worry...
8 days i dont think its not possible but who knows good luck recession time too so try your best.

This post has been edited by Bigblock: Apr 27 2009, 01:25 AM

Should this in the Overclock section? :-

http://forum.lowyat.net/OverclockersUnited

He can ask it here better Best PSU for OCer

Your problem is the power supply already almost at limit. Once you overclock means you are pushing even more. Minimum requirements for 4890 is 500W.

http://ati.amd.com/products/radeonhd4800/r...ments-4890.html

Get a higher capacity PSU for overclocking or just stay at stock speeds. Don't forget about capacitor aging. You will get less power supply after every year depending on how you use your computer.

This post has been edited by TristanX: Apr 27 2009, 01:37 AM

eh, who said it's "MINIMUM REQUIREMENT"?

check the site carefully, it says "500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended"

see, RECOMMENDED. meaning you can settle for something less than that because they (AMD, or the company who holds the product) will surely state a rating that gives MUCH more headroom than the minimum requirement.

and the stated RECOMMENDED would surely be covering 500 non-true power PSU as well.

so IMO ts punya ST56F would be enough.

I'm using Odin GT 550 with E7200 @ 3.6ghz with +0.25vcore AND a GTX295 (previously HD4870x2), which i think the graphic card alone already beats the HD4890 / X3 + OCing total.

----------

blindbox, how did you derive the OVERHEAT theory? it could be just some bad components.

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Added on April 27, 2009, 1:41 am

btw his PSU not even 2 weeks old.




This post has been edited by goldfries: Apr 27 2009, 01:41 AM

Fine with me. I'd go with a lot more room for upgrades and overclocking than following the "recommended" requirement. Cooler power supply and last longer too.

I've used Silverstone ST56F with 8800GT for my current spec before and overclocking is limited for this power supply.

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

How did I know it's overheat? I thought it's stated. Anyway, the main symptom is I can't start the computer after it crashes.

Oh and, regarding PSUs, I'm pretty sure that even my PSU is overspecced for my rig.

I tried an open air system(basically I just put the PSU outside), it doesn't work either, it still crashes. That settles it I guess, I'm rmaing it this thursday(now I'm actually thankful I have exam in two weeks LOL).

Plus, do notice I was stable when I OC the CPU to 3.2 GHz only. Then the computer crashes when I start OCing the graphic card as well(crashes during the full load test).

Same thing when I OC CPU to the max, it caused crashes as well. The motherboard chipset reached 70 C at max OC, but that's not the problem, as it reaches 70 C only at max OC. When I did 3.2 GHz, it didn't reach that high.

I've singled out every single OCed component, all stable. It's just that when I simultaneously overclock all of em or did it too much in one that it crashes. I'm confident that it is 100% stable.

By crashes, I mean the computer suddenly switches off completely, and won't start until the PSU cools down. This is a typical symptom of PSU overheat. I know, as I have experience in this happening

That solves it, I don't see anyone having a problem with st56f other than me, hence a faulty unit. I'm RMAing this thursday. I'll wait for a while before I close this thread.

They're meant to operate at 50 C. When I touch it in open air, it's pretty cool. So I bet one of the components aren't properly attached to the heatsink or something. I'm not going to risk my warranty especially when I don't know much about PSUs.


If you guys want to know, my symptoms are DEFINITELY not one of an overload. It's an overheat.


Plus, my PSU is doing 9.52V on +12V according to everest. I haven't checked it using a multimeter though(trying to find one in my house.. I'm pretty sure it's somewhere...)


@TristanX: Did you experience the same problem as mine when you once held your st56F?

This post has been edited by blindbox: Apr 27 2009, 10:22 AM

did the fan work...?

Yes the fan works... lol you had to ask? The fan does move slow, though it's meant to be that slow.

when you re-power up the power supply, the mobo auto start or you have to push ON button?
this question related to PSU or mobo faulty

This post has been edited by ktek: Apr 27 2009, 02:38 PM

Obviously it doesn't . It shuts off and I have to wait a few minutes to start it again.

ok... is there a 3 pin connector wif small wire...? which fits into the mobo... maybe it needs to be connected to the mobo for fan speed control... it shouldn't run slow at all times... the speed should go up at higher load...

u pulled more then da psu can support of course overheat lol.....only overload da psu can caused overheat. unless da fan is not spinning only overheat

er.... your psu is not enough juice lei....get atleast 600watt.
u gotto see your spec, your silverstone watt barely able to handle