HD4850 ($199 rumoured) vs. 8800GT ($249) and HD4870 ($329 rumoured) vs.9800GTX ($299)

http://www.nordichardware.com/news,7854.html

GTX280 ($649 rumoured) vs.9800GX2 ($599)

http://vr-zone.com/articles/NVIDIA_GeForce_GTX_280_Preview/5872-3.html

GTX280 ($649 rumoured) vs.9800GTX ($299)

http://www.theinquirer.net/gb/inquirer/news/2008/06/14/complete-gtx280-scores-here

Conclusions:

HD4850 is 1.4x as fast on average than an 8800GT and also much cheaper

HD4870 is 1.4x as fast on average than a 9800GTX and the same price or cheaper

Based on usual CF scaling, HD4870X2 or HD4870 Crossfire will be significantly faster than a GTX280 at a lower price.

GTX280 varies between 0.8x and 1.25x as fast against a 9800GX2, and more expensive

GTX280 varies between 1.2x and 1.7x as fast as a 9800GTX OC, and more expensive

Absolute best single card performance will be held by the HD4870X2, which will be cheaper than a GTX280.

Other Information:

The HD4850 and HD4870 cards are rumoured to be launching about the 21st of June; the GTX cards will launch this week

The HD4870X2 is rumoured to launch in August and will be slightly faster than HD4870 CF, however, CF may be done as soon as the HD4870 is launched

The GTX series core will get a 55nm die shrink in late summer which will reduce power and cost

The HD4xxx series will consume a lot less power than the GTX series (GTX280 has a rumoured 236W (!!) TDP)

The HD4xxx series has support for DirectX 10.1, while the GTX series only supports DirectX 10

The HD4870 has a confirmed, official value of 1.2TFLOPs which will significantly exceed the GTX280's value.

The GTX260 will be slower than the GTX280 (obviously) and is rumoured to launch at $449.

8800 GTs are going for $159 on newegg right now, and one of those has a $30 mail-in-rebate.  You're insane if you spend $250 on an 8800 GT.

MSRP is $249. I've put the MSRP for all the cards listed - you will be able to find a 4850 for much less than given too, for example. If I went and checked street prices, I couldn't co,mpare tham to the new cards because they don't have street prices yet.

Hmmm i might pick up a 4850 if it's only 100-200, i'm in need of a new video card, mine is ancient!

Usually not until a few months after they're released, and mass supply has been established.  The 8800 GT was going for $300 for several weeks because people were buying them up like crazy at that price.  I highly doubt you're going to find a 4850 for $100 for quite some time.

 No-one really knows what the supply situation is going to be. I'm going to leave it, and possibly back-edit it if it becomes  really out of date. As always, if you're going to base your purchasing decisions on what a random high-school-age AMD  fanboy has posted, then you should check the prices yourself.

First post has new benchmarks.

When is the HD4850 suppose to be launched.

 25the of June

I agree 4850 is looking like a very attractive card but you reeks of a AMD fanboi.

oh and MSRP for 4850 is most likely $199. Online retailers like amazon and buy.com are already listing it at that price.