One thing I'd really like to know is whether or not they are going to support these chips at all

Mobility Radeon support has been .. spotty at best, because AMD thinks it is up to the OEMs to deliver drivers. This causes compatibility programs because the OEM drivers are out of date and the AMD provided drivers aren't 100% compatible with each laptop. This has put me in a tricky situation more than once, and I still don't have 100% stable drivers for my Mobility X1600 in Vista 64.

AMD needs to stop procrastinating on this one and enforce a compatibility program that allows customers to just install the Catalyst suite for laptops, just as they do for their desktop cards.

Man, I'd so happily jump over a 75watt 4800 card if it was made for the desktop.

Holy crap-in-my-pants, Batman!!

Now, we can top-of-the-line games under a tree! Might be a short game, but who cares!

Now, this is something that I wanted to see from AMD! This is totally awesome! Hats off to you!

No clocks but gflops ehh...
So the clocks would be 550Mhz for the MHD 4800, 675Mhz for the MHD 4600 and MHD 4500/4300. In case of the MHD 4500/4300, this would be a INCREASE of about 10% compared to the desktop parts, I'm not sure I would believe this... The MHD 4800/4600 would be clocked about 10% slower than their desktop parts (compared to 4850/4670) which isn't too shabby, especially if considering nvidia's mobile parts (at least the 9800M GTX) which are clocked way lower than the desktop parts. In terms of memory, the quoted figures would correspond to 800Mhz gddr3 (seems this is what everyone uses for mobile applications) except the MHD4800 89.6GB/s which would correspond to 700Mhz GDDR5.
Needless to say, the MHD 4800 with these specs would blow the 9800M GTX completely out of the water, and even if it would only be paired with 800Mhz gddr3 it should be a good deal faster than the 9800M GTX - I don't know though how power consumption compares, but I believe the 9800M GTX is also in the neighborhood of 75W TDP.
The MHD 4600 OTOH won't be able to keep up with the 9800M GTS - the 9800M GTS is basically a 10% lower clocked desktop 9600GT, so just like on the desktop it will trail it (by a bit more even than on the desktop, since it's even more memory bandwidth constrained due to the slower ram). Should easily keep up with 9700M GTS though (and TDP might even be lower).

Finally the testicle cooking power of a 4xxx in a laptop.

About time. I can't wait to get a new laptop with one of these chips in it.

I don't think those 75W GPUs are going to be in any thin and light laptop. Battery life will be dismal.

ffffffffffFFFFFFFFFFFFFFFFFFFINALLY.

Wow, that kind of performance sounds pretty good.

I just don't want to pay the battery power hit... 75W thermal envelope for a Mobility Radeon HD 4800 sounds reasonable until you realize a Core 2 Duo P8400 or similar is only 25W TDP. o_0

That said in a decent gaming laptop, a Mobility Radeon HD 4600 sounds like a good compromise between performance and battery life to me, and of the Mobility Radeon HD 4500 saves enough power, it might not be bad either in the mainstream...

When did hard core gamers (the only ones who should consider a lappy with a mobility 4800) start caring about power consumptions? Just wondering why anyone here is worried about 75 watts.

Crap.. I just paid $1000 for a laptop with a 9700M GTS in it. I would think a MHD4600 would kick its butt and be less expensive.

The 4600 is gonna be a great mid range laptop solution.

Sweet: here's to hopefully seeing some architectural derivatives showing up in future AM3 mobo's IGP later this year

Power consumption affects the size of the power brick, and the overall weight of the machine. For some that's a consideration. Usually in a gaming DTR machine, it's just a good idea to keep it in check, but folks expect 10+ lb machines if the GPU power is strong.

Believe that would also include DX 10.1 support, and basically run circles around the 9800M GTX

This is pretty cool stuff.