Why aren't xeon cpus in notebooks?

I've always found intel's mobile core 2 quads pretty expensive, both Q9200 and QX9300 priced at 851$ and 1,038$. I though it was because of the 45nm and 45W TDP.

But I've come accross the Intel's server processors (xeon),and I've seen quite a couple with low power and 45nm,
L5430, 12M L2 cache 2.66ghz (50W) 1333Mhz FSB 4 cores - 562$
L5420, 12M L2 cache 2.50ghz (50W) 1333Mhz FSB 4 cores - 380$
L5410, 12M L2 cache 2.33ghz (50W) 1333Mhz FSB 4 cores - 320$

It is a little hotter (5W), but why aren't these in any high-end laptops (apart from the cpu socket), and why are the mobile quads twice the price of these with lesser specs?
Couldn't someone make a laptop with whatever cpu socket these processors use?

I've used this for reference (a bit old - march 09) : http://files.shareholder.com/downlo...512-81D4-ECEA1CEA5528/Mar_29_09_1ku_Price.pdf,
but intel's site gives some vendor prices similar to that too.

 

They're desktop CPUs and vastly different in physical size than notebook CPUs. Very few notebooks use desktop CPUs.

 

I don't think the size matters, as long as you make a motherboard that takes it, right?

From what I've read since I'm on NBR, very few notebooks use desktop cpu because of the heat they generate. The clevo high-end notebooks use quads and i7 with TDPs of 95W to 135W. These xeons are rated at 50W.

 

The problem is, those processors do not fit any regular desktop motherboard sockets either. You need to custom design one based off of a Socket J (LGA 771) server board, which most companies are not willing to do since the demand is so low.

 

xeon processors also need ECC memory in order to work.There are no laptops which have chipsets which support ECC memory

Another thing you should realize is that Intel labels its cpu's TDP by average power usage. AMD on the other hand advertises maximum TDP

K-TRON

 

Xeons DO NOT need ECC memory to work.

 

It's a server proc. Have you actually seen one?

 

I've seen some mobos from TYAN that have a xeon LGA 771 socket. Can't they make a 'compact' version that would fit a laptop? Theorically?
And yeah it seems it needs ECC memory to work, at least these 3 xeons do. So I guess for that part it doesn't work

 

I just don't think there is high enough demand for it.
As it is, there are very few laptops made with a desktop socket.

 

In theory they can but in reality it's either not feasible or practical to do.

 

Well I got a pile of xeons and opterions here, I may just have to build a luggable machine in a briefcase out of a couple for the heck of it someday

 

Sorry, but AMD's way is worse. Intel's way was worse with Pentium 4, but that had to do with architecture, not the methodology: http://it.anandtech.com/IT/showdoc.aspx?i=3606&p=2

If you read the power consumption measurements now, even the synthetic benchmarks can't even put it close to TDP with the Intel.

http://www.xbitlabs.com/articles/cpu/display/core2extreme-qx9650_13.html#sect0

To the OP: Certainly, its possible to make a laptop using a Xeon CPU. The laptop version does have some advantages like being socket compatible with the dual core mobiles and also supports low power C-states like Sleep/Deep Sleep, etc. Like the Xeon can only idle to 12W but with deeper sleep states the mobile version can reach 4.0W. I think the package itself is also thinner on the laptop than the Xeon as they want more robustness on the Xeon.

Yes, they'll have to make a custom motherboard and probably it isn't worth it to the manufacturer.