ok i have decided to bought new pc with following configuration....

nforce 3 motherboard socket 939
AMD athlon 64 3000+
geforce 6600 256mb
1 gb ram
120 gb hdd
DVD-RW

now all is fine....but there is one problem about my case....the case is too much expensive which the salesman is recommending....with water cooler and power supply 450 watt.....i cant afford it...it is neccassery to buy this sort of case.....
          there is another case with one fan at the rear and two on the side where the vga card lies...and another exhaust fan linking with the processor....is it ok and suits with my specification....thanks

I run my brand new 64 bit 3500+ system in an old stripped out case frame.



You can just hang all the hardware from a wall hook if you want, cases are a waste of money unless you have some kinda Vermin chewing at your cables.

Any el cheapo 500w PSU will do, or go to the dump and get an old PSU (atx 2.0) from there, it will work.

Tell the salesman to pick on someone else, or get a new salesman, it sounds like he's ripping you off so I bet you could get your stuff cheaper and get a fancy case for a better price anyway.

BTW....... You are getting an nForce3 chipset? Why? It's the wrong one! Probably another ploy by the salesman to clear old stock out of his shop, BEWARE!!!

Get the nForce4 SLI or Ultra chipset for goodness sakes man!  

Your chosen video card is a junky RIP OFF! Don't  buy it.

256mb 6600 cards are sub-standard garbage with a heap of trashy ram thrown in for good measure.

Get a 128mb 6600GT card ............. the "GT" model won't cost much, if any more than the trash he's trying to flog you. Don't worry about the 128mb ram on the GT either, it's much faster than 256mb of trashy ram on the other card.

Hard drives are dirt cheap, the 200gb ones are almost the same price as the 120gb ones, get a bigger drive.

Make sure your ram has fast timings, junk ram, generic off the shelf stuff in the shops, is not very good, make sure you get the ram specifications and check them BEFORE you buy it. He will rip you off with cheap slow ram!

Make sure the DVD is "super multi - dual layer" format compatible, these latest drives are very cheap now.

The CPU you chose is too slow for the nforce4 chipset and in general, so use the money you are now going to save (by getting a better supplier) and get an Athlon64 3500+ instead.

I might be being a little hard on your supplier, but I've seen almost everyone get ripped off to some extent, and the guy you are dealing with is about to lumber you with a load of junk..

Let the buyer BEWARE!

Oh, cases from the dump often need a can of flouro paint to spruce them up a bit   

Sorry, I couldn't advise sooner.  

I just like to see folks get the good stuff.

ok thnakssssss i am changing nforce3 to nforce4
6600 to 6600 gt 128
and now i will also takecare of my salesman
thanks for u replies
and one more question with nforce4 motherboard it is important to have a PSU more than 450 watt.thanks

I second everything congo says, but I'd spend some money on the PSU. Cheapo PSU sometimes advertise false ratings on their boxes; they can't handle their wattage rating at full load. A good PSU isn't that expsensive, get a thermal take or antec. You'll need ATX2 compliance and at lest 420 watts.

A bad PSU can make a system very unstable and can cause random crashes.

BTW, I'm assuming your building your own comp. I suggest you dump your supplier like congo suggested and use newegg.com or tigerdirect.com. These two online vendors are awesome and will save quite a bit of money; they have some great deals.

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Seconded.

I recommend the Hiper Modular Type-R 580W Power Supply > http://www.frozencpu.com/psu-163.html?id=S7Kv3LxB As far as I know this is one of the highest rated power supplies on the market, and not too bad at only $130 for 580 watts