New system:psu is enough?

I have bought new components except Graphics card and PSU
Intel Core i5 2400 Quad Core 3.1Ghz
Intel DH67BL Original motherboard
2x2GB DDR3 1333Mhz(Kingston & Corsair,not high end but for budget users)
XFX Geforce GT240 1GB GDDR5(I didn't buy a new card due to tight budget,but this card I am using it since 2010 and totally satisfied with almost all games,good fps,my monitor is just a 16" widescreen)
1TB + 320GB Seagate Barracuda
1 Optical Drive

I have a Cooler Master Elite Power PSU and according to Intel,this config needs atleast 460W of power and I checked with many online PSU calculators but they all show entirely different values.
But I am using the current PSU with no problems at all.I mean I found no problems related to lack of PSU.I have done a test in which Prime95 64bit and Furmark running at the same time,so that processor and graphics card took their maximum power.But nothing happenned except temp rise (graphics card-under load 70 degree max and became steady and processor-73 degree and became steady).According to their manufacturers ,temperatures are good.System was extremely stable at that time,I was able to do multitasking at the same time.

So,should I upgrade to a new PSU?

The I5-2400 is rated at 95W. The GT240 has no auxiliary power connection, so it is limited to 75W or less. That's 160W max from the most significant power consumers in the system. Assuming that all of that came from the +12V line, that'd be 13.3A. Your PSU has two 12V rails, 10A and 13A.

I think you're OK with the 350W PSU with your current configuration, assuming the the Cooler Master unit is of good quality. You don't have much margin for upgrading the graphics card, though.

I admit that PSU recommendations are difficult for me. I prefer ones with excess capacity for my own PCs, but I have to resist the urge to spend other peoples' money for them.

bobkn said:

The I5-2400 is rated at 95W. The GT240 has no auxiliary power connection, so it is limited to 75W or less. That's 160W max from the most significant power consumers in the system. Assuming that all of that came from the +12V line, that'd be 13.3A. Your PSU has two 12V rails, 10A and 13A.

I think you're OK with the 350W PSU with your current configuration, assuming the the Cooler Master unit is of good quality. You don't have much margin for upgrading the graphics card, though.

I admit that PSU recommendations are difficult for me. I prefer ones with excess capacity for my own PCs, but I have to resist the urge to spend other peoples' money for them.

I have very bad financial issues and not thinking about a future upgrade.But I consider the safety of the components.Even though you say it is just "okay",but I need whether it will damage any of these components for long run.Sorry for not mentioning about damage in the question.
I mainly use the PC for modern games at a max resolution 1366x768 at moderate high graphics("unfortunately" games run at high settings with very good fps at this resolution,though my friends suggested this gt 240 is a weak card)
then HD Movies,internet surfing thats all.
With this config,I played Crysis series,Deus Ex Human Revolution,Assassin's Creed Series,Call Of Duty series,Mass Effect 3 at moderate high settings.But I haven't experienced any crashes,bsods or any other errors during game play except when Anti Aliasing,Anisotropic filtering etc are increased,I experienced low fps but playable around(20-30fps). I think this is just graphics card processing power limitation and not a PSU issue.

Thanks for your good answers by the way.

I agree with everything everyone is saying, You should never skimp on a power supply. Corsair do a great PSU that wont break the bank, I run the GS800 with a Phenom II 955 x4 and 2 GTX 480's with no problem at all, You should be fine with the one you have now, but always better to have the headroom :)

Corsair Gaming Series GS500 , CP-9020005-UK, 80% Eff', 80 PLUS, ATX v2.3 PSU - Scan.co.uk

There are better one's than the one above, but for basic use I think you should be fine

I'm looking at a new PSU myself as the one that came with my Dell is only 375 watts and I am adding some new components.

Can they be mounted with the fans at the top or bottom? As my case doesn't have any vents on the top of it.

If a case don't have holes for the PSU, then You will have to have the fan mounted so it is facing inside the case (exhaust)

Thanks Adam,

Is the top fan for sucking in air or blowing it out then? Have to say when it comes to building my own System and parts I'm still learning!