all ur questions can be answered by this review here --
*www.hardwaresecrets.com/article/540/1
but for ur convenience i will quote answers from that website!
1. What is the maximum output this PSU have?
You will bring home a relatively inexpensive power supply that even though is sold as being a 450 W unit can deliver up to 570 W at 48º C – in fact Corsair could have easily labeled this power supply as a 500 W unit, but they preferred to stay on the safe side.
clearly its underrated PSU since corsair wanted to be on safer side!
2. At what price is this really available?
different prices at different places i got it for 3.4k but i heard u can get it at 3.2k as well ! and that too in hariyana !
3. Is this PSU best and if yes then why?
in this price range yes its the best! cos CM600W works on efficiency of 70 % that means 600x70%=
about 420 watts of constant power,while vx450 gives 450W even if its rated @450!
Comparing Corsair VX450W to other entry-level power supplies we have reviewed recently (the exception goes to Zalman ZM360B-APS) is like comparing the old VW Beetle to the new one. This model from Corsair brings an updated design with active PFC, higher efficiency, lower noise level and the ability to deliver far more than its labeled power and also more cables: six peripheral power cables against four and six SATA power cables cables against four or even two.
As we mentioned, this product is identical to Antec EarthWatts 500 W, but using better capacitors – it was really good to see Japanese capacitors on an entry-level product
such quality capacitors are not present in CM600W and there is a problem of current locking,which is getting common these days,new CM600W are going kaput more often
warranty
corsair -5 years.
coolermaster -2years.
4. Which models are its competitors?
only coolermaster 600W is its competitor as the other models from other PSU maker like tagan,OCZ and thermaltake are not present in this segment!
5. Is this sufficient for HD 4850?
more than sufficient for HD4850
according to corsair website
*www.corsair.com/psufinder/default.aspx
this can even support a HD4870 without issue ...so HD4850 will be well supported,
i m using a C2D machine with HD4850 with Vx450 ...no problem there !