450 watt PSU or 550 watt PSU?

450W is more than enough with overclocking. But a lot depends on the brand of 450W you used. Trust only Corsair, Seasonic, Antec.

Mine is the one which came with the cabinet.is it ok?

no, unless its an Antec case, the PSU's that come with cases are generally cheap fireworks. For $30 you wont get anything better than what you have. The best low end unit for your system would be the Antec Earthwatts 380w. I know, its only 380w, but Antec load test their PSU's and rate them as Continuous Wattage. Cheap 450w psu's would be lucky to produce 200w continuous. The world of power supplies is confusing, unfortunately many cheap manufacturers blatently lie about the psu's specs and somehow get away with it.

That is the major problem. Get something better.

You've been given good advice. I hope you follow it. Brand name PSUs ARE worth the extra $$$.

I would always go higher, the waste watts is negligible at that level. Though, you might not needed, you may want it later. Just make sure, you get a decent brand, for a 550w PSU and get at least 40amp single rail PSU.

^absolutely no need to get a 550w 40a single rail psu. for his setup a single 18a rail from a quality psu would be enough.

Also I would like to stress even more the need for a good quality PSU.
Actually that would be only component in a PC that I wouldn't allow my self to go cheap...

^ im pretty sure anyone that has bought a cheap psu for a computer has regreted it. I know i did back in the day and when the psu blew up it took my motherboard with it. It claimed 550w but couldn't even run an athlon xp cpu and 9800gt vid card

make sure you go with the branded ones, cheap/generic psu's dont meet the power labeled with it, 30 usd??? theres no way, dont make your psu as your last choice to spend,
if it does not give enough power to your system it can cause you more, it will be dead and it will also damage your motherboard and videocard, the more it will cause you.
alot of good psu out there, corsair, enermax, thermaltake, antec, FSP, but if you are on a budget, maybe you could find a decent one in thermaltake or a coolermaster.
atleast you get a decent psu, i will go for a lower wattage but branded 450w than a cheap 600w psu.

ok thanks everybody.......it has been really helpful.....so is 450watt branded psu good for my config?...

Depends on which brand you are getting! Get Corsair, Antec, Seasonic and you cant go wrong.  

yes branded 450w will do in any corsair, xfx, seasonic, antec, enermax, FSP, silverstone, this are the top psu makers. if your on a budget maybe you can get a 500w coolermaster or thermaltake, this are decent brands also.

ok....i have two options..
1.Gigabyte Superb 460W GE-R460-V1 ($40 approx.)
2.Corsair Builder Series 430W (CMPSU-430CX) ($48.5 approx)

No to both. Get Corsair VX450W. That is a better one.

sorry but no cause i am really tight on budget (max $50)

CX430 then. But frankly you should not ease out on a PSU. The most critical part of the PC! It is a decent PSU, but not quite the Corsair quality you expect.

Can you list your options available ?, for the price range.

one thing is concerning me.i wanted to confirm if this is the only problem and i dont waste my bucks by buying a quality psu.will it surely solve the problem of overheating and crashes and instability? thanks

i bought a cooler master extreme Power edition 460 watt but it did not totally solve my problem....but anyway thanks to all of you.  

Dont forget XFX Seasonic is the OEM for them.

I would go for Corsair for $35.00 after reabte you can't go wrong.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Please don't skimp on a PSU I did one day and I still regret it to this day. The PSU is the most overlooked piece of hardware in a system. When cheap PSU died it took every thing connected with it. Mother board video cards hard drives the whole shot went with it. So please don't skimp on the PSU. It's easy to blow your all your PC hard ware on a $25 PSU.

I think the OP is from India. So no XFX available here and especially no newegg and its goodies!!!  

Did not know where he was from

yeah right.....but www.theitdepot.com provides plenty of goddies....like corsair, seasonic..etc....and its an indian site.

Well i see that XFX PSU's are available at ITDepot. But anyways we already have told you which one's to go for and its up to you to decide now which one you prefer within your budget.