Which one u choose. between 2 cards.Ge force 8800 GTX 768MB or GeForce 9800 GTX.?I hope you guys give me good reason for your choice

If I had to choose between those two, price would most likely be my deciding factor. If you don't have a power supply that can handle the 8800GTX, then maybe the 9800.

Well, let's see. I'll compare the BFG 8800GTX ($360 at newegg now) with the BFG 9800GTX ($330).
 
Advantages for the 8800GTX: better fps at high resolutions in single-card setup.
 
Advantages for the 9800GTX: $30 less, no mailing rebate junk, consumes less, less heat, support for Triple-SLI (assuming you have a 780i board and a serious PSU and case).
 
For a single-card setup, and a resolution of 1680x1050 or more, I would still buy the 8800GTX, I think, or maybe the 8800GTS G92 512MB. It depends on the budget.
 
For 2-card setups, I'd pick the 8800GTS G92 512MB.  
 
For 3-card setups, the 9800GTX.
 
Edit: you should probably compare the 9800GTX with the 8800GTS G92 first. If you don't need 3 video cards, you can stick with the 8800GTS G92 and save lots while still getting the same performance or very close.

 
8800GTS 512    

You could also compare the EVGA 9800GTX ($330) vs the EVGA 8800GTX ($340 before rebate, $290 after rebate) and honestly even if I wasn't going to cash the rebate for whatever reason I'd still pick the 8800GTX.

From what I understand OC'ing the G92 does not net you the same performance benefits as OC'ing the G80 core (At least that's what I'm led to believe by some of the comments of G92 owners in this forum). The other thing that worries me a little about OC'ing these cards (That may or may not be fixed with the 9800GTX) is the fact that there were some strange problem going with the memory I believe when it was OC'ed past 2000 that affected the longevity of the card.

For what is worth, the 9800GTX is no doubt a great card (No matter how you look at it, it's a rehashed 8800GTS G92), however the 8800GTX still feels like the better "high end" package to me if you get what I mean. One thing that cannot be denied is that you will need a PSU for the G80 core to feast on, because they are power hungry.

well if u check online reviews 9800 gtx seems beats 8800 gtx 768
check it out.
http://www.techspot.com/review/92- [...] age10.html
http://neoseeker.com/Articles/Hard [...] gtx/7.html
 
And moreover 9800 uses less power consumption.I got 500 cooler master PSU so i am taking that thing into consideration too

Based on the two reviews, I would probably choose the Radeon 9800GTX... err... I mean the GeForce 9800GTX.

aevm, I was under the impression the 8800 GTX was tri SLI compatiable aswell?

 
Yes, the 8800GTX and Ultra are Tri-SLI compatible. aevm just screwed up unforgivably, that's all        
 
Sorry aevm  

I'll rather get the 8800 GTX, at least it has a higher memory bus and more RAM unlike the POS 9800 GTX which I think is a joke. WTF was NVIDIA even thinking when they made the 9800 GTX.
 
And a 5-10% performance increase just ain't worth it. The only good thing about the 9800 GTX that its cheaper, though its not worth my time.

 
Oops, I did. Yeah, I was thinking of the 8800GTS. Sorry...  
 

Ha ha np mate! I'm just having fun........

 
 
Definitely agreed, the 768MB memory of 8800GTX helps it to beat the 9800GTX in higher resolutions  
 
From tomshardware review:
 
So come on, Nvidia. Is this really the best you can do 17 months after the 8800 GTX?
 
 Nvidia GeForce 9800 GTX: A card that's almost as fast as the 8800 Ultra at a much lower price is a good thing. But a year and a half after the release of the GeForce 8 series, and even though AMD doesn't really have anything that can go head to head with this card, we'd have liked a little more punch to replace the 8800 GTX with (which is also now being sold for under $400). What we got instead was a card that's very noisy under load and limited by a stingy 512 MB of memory. These drawbacks are especially disappointing given that the 8800 GTS 512 MB is very similar and less expensive.
 
 + Performance close to that of the 8800 Ultra at half the price / Support for HybridPower (with compatible motherboards) - Noisy under load / Only 512 MB of memory / Not different enough from the 8800 GTS 512 MB, 8800 GTX and Ultra, although they're previous-generation cards and often less expensive.

I don't even understand why this is even a question.
 
1. The 9800GTX is cheaper
2. The 9800GTX is better in terms of game performance (see Toms Hardware review benchmarks)
3. The 9800GTX consumes less power
4. The 9800GTX generates less heat
 
Why would you even consider buying a 8800GTX!? (Unless you took advantage of the rebate, then it would be a bit less expensive)
 
 
Plus, the 9800GTX will only get better with more time and newer drivers...

Maybe because it has more ROPs, TMUs, a wider memory bus and 256MBs of more memory?    
Actually, I wouldn't buy either card today; I think you'd be better off saving money with an 8800GT or GTS.

 
These are true; however, the 8800GTX sees much larger gains when overclocking because of the additional ROPs.

 
Non of this matters if it doesn't perform better in real game benchmarks (see toms review)...

768 Mb vs 512mb with my 1920 x 1200 setup, I would go with the 8800 gtx. But my GTS 640mb has done very well, no complaints. I think the 9800 gtx is a step backwards for people with high res setups with only 512 mb. I will hold out for the next gen cards at the end of the year.

No 8800GTS 1GB? http://www.xbitlabs.com/articles/v [...] -1024.html
 
I'd get this for high res.

I faced the same decision today when my GTS 640mb failed. I went for the 9800GTX despite my reservations about the stingy memory issues. Worst comes to worse I'll sell the GTX and get a Radeon in June. I'll post again relating my experiences with the tweaked GTS G92 (aka the 9800gtx) when I get it.