gecube hd4850 or palit hd4850 ?

You would need to link us to the specific cards you are looking at buying before we could answer that.

Mactronix

Im sorry but for some reason the first two links dont seem to work ?
I have done some looking around and will give you some buying advice based on what i have found and what i know.
Palit and indeed Gecube make more than one version of these and indeed most of the different cards they produce. Usually the first cards released will be very similar as ATI/Nvidia don't let the overclocked cards out until a few weeks after the first launch.
I personally recommend you go with a 4850 and not a 9800GTX+ . They perform nearly the same but i favour the extra features of the ATI card like the HD decoding and support for DX10.1.
Things to look out for are. A dual slot cooler(this means it will need two cards worth of space to fit) so you will use two slot spaces to fit it in the case. like this http://www.ebuyer.com/product/148280 It pushes the hot air out the back of the case through the grille on the top of the card which is better for your system and these coolers are better at cooling the card as well.
Other things to look for are the amount of RAM 512 is plenty but if you can get one with 1GB for similar money then its worth it.
Clock speed should be about 625 for a standard card and Palit do a sonic version which is clocked at 685. This is the core or engine clock and is the main processor speed. so any thing above this will be good.
Memory speed is about 2000 for a standard card and again anything with a higher number is better. This is the DDR (Double Data Rate) figure and some times you will see a number about half of this which is the actual memory rate. The DDR speed is the one that matters as this is the actual speed the card will run at.
The Ramdac will be 400
I hope this helps and im sorry i cant see the actual cards which would have made it a lot more simple.
Any more questions please feel free to ask.
Mactronix

Hopefully this link will work. It describes the dual slot cooler very well. http://www.hisdigital.com/html/pro [...] 5&view=yes

Both the cards you are looking at are basically the same card. The only differance is the sticker on the fan. This is a case of the generic cards i mentioned that are issued before the Overclocked and special editions are released.
If you are not in a hurry i would wait and see what other cards are released, say a couple of weeks. The cooler on the Palit Sonic is a decent one and should keep the card nicley cooler than the standard set up.
You will need to decide if the extra money will be worth it. I am clueless about your currancy im afraid but in pounds. If the card cost £100 without the overclock and better cooler, then £120/£130 would be about the limit of the differance it would be worth, with the cooler and Overclock.
The thing with overclocked cards is that, while you can in most cases buy a standard card and get just as good an Overclock yourself. You dont get the better cooler and the Overclock is Gauranteed on a card that has a factory Overclock and not on a standard card. You could get a card and Overclock it yourself and acctually get worse performance.
The Palit sonic also states it wants a 500 Watt PSU. Your corsair is a very good PSU though and i think it will be ok.
I will check this and let you know.
mactronix

why are those the only brands you're asking about?

somebody posted a link to msi's 4850 and it was pretty impressive :

http://www.newegg.com/Product/Prod [...] 6814127370

Or go for the sapphire.

thanks for replying again to itadakimasu and mactronix.

@itadakimasu i wish to buy MSI card but service here of this particular company is so bad that vendors don't keep it.otherwise i would love to go for MSI.

@mactronix now i got a good idea about double slot cooler.and i am planning to buy the card by the end of this month anyway...so i will wait and look for sonic model and how benificial it is and at what cost its av available here.but then do i have to change my PSU too ? i checked it does require 500W PSU and 8-pin power connecter now whats that ? i have no idea about that ??

it looks like the prices are coming down and palit hd 4850 sonic costs even lesser to what the plain palit 4850 used to cost a week ago ...i hope the trend continues for a fortnight atleast..

i was wondering if i should go for new power supply maybe coolermaster 600w

http://www.coolermaster.com/produc [...] 59&id=4010

how is it ?

btw the palit 9800gtx + is for $207

here is the link http://www.theitwares.com/gfxcards/gfxcards.htm

just divide the prices given by 50 to get in us$