Question about Intel's EMT 64 technology.

[VigilanteCS]

Hi,
I've found a laptop I'm going to buy and it has an Intel Pentium 4 650 (3.4 GHz) with EMT 64 technology. I was curious, is the processor itself actually 64 bit or does it have a special feature so it can run 64 bit applications? Would windows XP 64 bit edition run on a p4 with EMT64?


Also, I read the P4 650 has a Prescott core, is that a good one? I know there is one p4 core that everyone hates but I don't remember which is it.

THanks for the help!

 

[imported_Kensai]

Yes, it has hardware 64bit extentions. It will work with a 64bit OS. Yes, it's the core that everyone hates. It's just way too hot.

 

[biostud]

It's 64 bit, and it will run XP 64-bit.

Prescott cores a generally hated because they produce a uge amount of heat, and generally is slower in games than the A64, but besides that it's a fine core

 

[SrGuapo]

It is OK... I wouldn't buy it fora laptop because that thing will run at 100C and last about 1 hour off its power cord, but that is just me. If all you plan on doing is setting on your desk, you should be fine.

 

[otispunkmeyer]

sorry to thread jack, lol

is EMT64 kinda like 32bit with 64 bit stuck on the end? and AMD64 is basically 64bit that can do 32bit very well at the same time?

 

[n0cmonkey]

Originally posted by: otispunkmeyer
sorry to thread jack, lol

is EMT64 kinda like 32bit with 64 bit stuck on the end? and AMD64 is basically 64bit that can do 32bit very well at the same time?

EMT64 is asshat for AMD64.

As I understand it, AMD64 is 64 bit extensions onto ia32. It's got both 64bit stuff and 32bit stuff.

 

[VigilanteCS]

Thanks for the replies. Are there any EMT 64 enabled laptops that don't have the prescott core that ARENT the extreme edition?

 

[DaveSimmons]

Yes, any AMD A64 laptop.

The 64-bit extensions intel uses were developed by AMD, intel used their cross-licensing rights to copy AMD's instruction set. If you want to run Windows 64-bit or a 64-bit linux there is no reason to prefer a Prescott to an A64.

The laptops that you want intel for are only their Centrino laptops (not Pentium 4 CPU, and no EMT64).

 

[imported_Kensai]

Originally posted by: DaveSimmons
Yes, any AMD A64 laptop.

The 64-bit extensions intel uses were developed by AMD, intel used their cross-licensing rights to copy AMD's instruction set. If you want to run Windows 64-bit or a 64-bit linux there is no reason to prefer a Prescott to an A64.

The laptops that you want intel for are only their Centrino laptops (not Pentium 4 CPU, and no EMT64).

Nope, AMD chips don't have EMT64.
They run off of x86-64.

 

[VigilanteCS]

My problem is I want a fairly high end graphics card, and the highest (at least that I can find) with an A64 mobile is a radeon 9700. The laptop I was looking at has an X800 mobility, and it's only $2,200. It's a Sager NP7620.

PS. I'm not worried about batter life, and also, how hot do Prescotts run?

 

[n0cmonkey]

Get a desktop.

 

[n0cmonkey]

Originally posted by: Kensai

Originally posted by: DaveSimmons
Yes, any AMD A64 laptop.

The 64-bit extensions intel uses were developed by AMD, intel used their cross-licensing rights to copy AMD's instruction set. If you want to run Windows 64-bit or a 64-bit linux there is no reason to prefer a Prescott to an A64.

The laptops that you want intel for are only their Centrino laptops (not Pentium 4 CPU, and no EMT64).

Nope, AMD chips don't have EMT64.
They run off of x86-64.

:roll:

 

[VigilanteCS]

Already have one. Can I please get some answers so my questions? I don't wanna sound like an a$$ but I'd like to know. Is there any other p4 that has EMT 64 that isn't a prescott or EE that I can get in a laptop?

 

[Skotos]

Originally posted by: n0cmonkey
Get a desktop.

look at his desktop in sig why would he upgrade ?

 

[Skotos]

Originally posted by: VigilanteCS
Already have one. Can I please get some answers so my questions? I don't wanna sound like an a$$ but I'd like to know. Is there any other p4 that has EMT 64 that isn't a prescott or EE that I can get in a laptop?

i think only the 6XX series has emt 64

 

[biostud]

Originally posted by: Skotos

Originally posted by: VigilanteCS
Already have one. Can I please get some answers so my questions? I don't wanna sound like an a$$ but I'd like to know. Is there any other p4 that has EMT 64 that isn't a prescott or EE that I can get in a laptop?

i think only the 6XX series has emt 64

the 8xx dualcores have it as well.

 

[uOpt]

Originally posted by: VigilanteCS
I've found a laptop I'm going to buy and it has an Intel Pentium 4 650 (3.4 GHz) with EMT 64 technology. I was curious, is the processor itself actually 64 bit or does it have a special feature so it can run 64 bit applications? Would windows XP 64 bit edition run on a p4 with EMT64?

Also, I read the P4 650 has a Prescott core, is that a good one? I know there is one p4 core that everyone hates but I don't remember which is it.

The Intel processors have EM64T (not EMT 64) which is pretty much a copy of AMD's x86-64 instruction set. Plus they have hyperthreading.

All 64-bit capable Pentium-4s are Prescott cores or the equivalent 90nm Xeon core.

64 bit Intel chips are IIRC 5x0 with "J", all 6x0 and all Xeons with 800 MHz FSB (which is also 90nm).

The 6x0 Prescotts have also been found to eat less power, at least 10 watts less than equivalent 5x0 which makes them slightly better for laptops.

To actually use the 64 bit stuff you also need support from the mainboard and the BIOS. There doesn't seem to be an easy table of capable parts but IIRC it is the 925XE and 955X chipsets that you can use. Other socket 775 chipsets will not work. Don't know about Xeon boards, I assume any bord which can host a 90nm Xeon has EM64T capability.

The best notebook to get is the Sager 9860 which comes with a 64 bit capable chipset, can hold 4 GB of RAM and has an option for a NVidia 6600 or 6800 video chipset.

I would seriously consider getting one of the HQ/Compaqs with AMD64 and GeForce 4 Go instead. They have a desktop CPU, but then so does this Intel stuff.

 

[imported_Kensai]

Well, I think you can get a laptop based on the Sonama (something like that) platform with a Pentium M and an x800 mobility.

 

[uOpt]

Originally posted by: otispunkmeyer
sorry to thread jack, lol

is EMT64 kinda like 32bit with 64 bit stuck on the end? and AMD64 is basically 64bit that can do 32bit very well at the same time?

Both pretty much perform the same in 32 and 64 bit mode, depending on application.

Of course for some applications that actually use more than 2/3/4 GB virtual memory and for some applications using > 32 bits integers there is a huge speedup. But generally it is the same ballpark, unlike ia64 which actually has an ia32 emulator.

Some code runs slower in 64 bits, usually code with lots of pointers, very dynamic code mostly based on lists (as opposed to arrays), gargabe collection can slow down. All this is due to the doubling of the size of a pointer. If your code uses a lot of pointers your data work set grows accordingly and you threaten the L1 data cache.

AMD's 64 bit CPUs have the bigger L1 cache and should tackle the latter problem much better.

 

[NightCrawler]

From Intel: http://www.intel.com/technology/64bitextensions/

Intel® Extended Memory 64 TechnologyF (Intel® EM64T) enables
64-bit computing on the server/workstation and desktop platforms when combined with supporting software. Intel EM64T improves performance by allowing the system to address more than 4 GB of both virtual and physical memory. Intel EM64T provides support for:

64-bit flat virtual address space

64-bit pointers

64-bit wide general purpose registers

64-bit integer support

Up to 1 terabyte (TB) of platform address space

Basically there was x86-32 and AMD created x86-64 which is backwards compatible with x86-32, Intel tried to create IA64 but it was never very popular and pretty much died. Intel finally caved and released Intel CPU's with x86-64 { called it EM64T though just to confuse people }.

So you have a 64 bit Windows platform that can also run 32 bit at full speed. The only downside is that all drivers must be 64 bit and that 16 bit code doesn't run anymore.

PS: Windows XP Professional x64 is awesome !!!!!!

 

[n0cmonkey]

Originally posted by: Skotos

Originally posted by: n0cmonkey
Get a desktop.

look at his desktop in sig why would he upgrade ?

Why get a laptop that's heavier than most compact cars?

 

[VigilanteCS]

Originally posted by: MartinCracauer

The best notebook to get is the Sager 9860 which comes with a 64 bit capable chipset, can hold 4 GB of RAM and has an option for a NVidia 6600 or 6800 video chipset.

I was considering a Sager 7620 Supra http://www.powernotebooks.com/product.php?itemId=545
Upgraded to an Intel p4 650 (64 bit proc), upgraded screen and 80 gig hdd.

Since the CPU is 64 bit, that means that the mainboard has a 64 bit capable chipset, correct? Or si the 9860 the onle one that comes with a 64 bit compatible chipset? I don't want a 9860 because, for one reason they don't make them anymore (They're now the 9880), and theyre just too big.




Would I need to worry about a Prescott overheating in a laptop?

 

[uOpt]

Originally posted by: VigilanteCS
Since the CPU is 64 bit, that means that the mainboard has a 64 bit capable chipset, correct? Or si the 9860 the onle one that comes with a 64 bit compatible chipset? I don't want a 9860 because, for one reason they don't make them anymore (They're now the 9880), and theyre just too big.

No , the EM64T Prescotts run in a whole range of chipsets that don't expose the 64 bit capabilities. You need to figure out the exact chipset. And even then the BIOS can still screw it up.

I think you have no choice than getting in writing that it will run a 64 bit OS before buying.

Would I need to worry about a Prescott overheating in a laptop?

Yes, but the 6x0 series are better than the first prescotts.

I would trust Sager to have enough ventilation. But it will be loud.