installing 64 bit windows 7

[MadmanRB]

Believe it was anything Prescott and after were 64bit compatible, as I know Prescott implemented 64bit. Don't think previous families supported it.

No, but even Prescott was flaky.
My old HP desktop had a Prescott, later end and sort of supported 64bit

 

[C0RR0SIVE]

Not just any prescott core could do 64bit, while they was all the same for the most part, Intel decided to lock things so they could introduce them a little later on and increase the prices a bit to get more money.

The only Prescotts that support 64bit (Which still isn't a true 64bit CPU, some 64bit applications will crash or not operate at all) are the following from what I can find.
Prescott-2M
2.8Ghz - 3.8Ghz
Came out on or after Feb 20th 2005
Pentium 4F or later stepping

There is a reason why Intel failed so hard with the P4, it's because they gave a bunch of different things the same name, stayed quiet, and severely overcharged for what they did offer.

 

[carnageX]

I tried finding a list, but couldn't really find one that said which P4's had 64bit support specifically.

 

[Joe C]

I tried finding a list, but couldn't really find one that said which P4's had 64bit support specifically.

Look here
Intel Pentium 4 660 single-threaded performance

 

[carnageX]

^ But that's just a performance list - not a list that includes whether or not they support 64bit instruction sets.
Was hoping it'd be in here, but it's not: https://en.wikipedia.org/wiki/List_of_Intel_Pentium_4_microprocessors

Found one:
https://en.wikipedia.org/wiki/List_...Intel_64_.E2.80.93_NetBurst_microarchitecture
Short one here as well: https://help.ubuntu.com/community/32bit_and_64bit

 

[Joe C]

There's links on that page to the P4 chips.
This 660 is a single core x64
Intel Pentium 4 660 3.6 GHz - JM80547PG1042MM / HH80547PG1042MM (BX80547PG3600F)
You can use that site to compare different model number chips. The OP didn't specify which P4 he has. By checking the CPU specs from my link, you'll be able to see that a 505 P4 is only x32
http://www.cpu-world.com/CPUs/Penti...0671M (BX80547PE2667E - BX80547PE2667EJ).html

 

[carnageX]

The P4 505 is x64 according to Intel's Ark page:
Intel® Pentium® 4 Processor 505 (1M Cache, 2.66 GHz, 533 MHz FSB) Specifications

Instruction Set 64-bit

Which supports the claim for Ubuntu's page of what CPU's are x64:

F and 5x1 series Pentium 4 using the "Prescott" core

 

[Joe C]

Dunno what to say.... even the Newegg site that had sold this chip states that this chip is not a 64 bit support chip
Intel Pentium 4 505 Prescott Single-Core 2.66 GHz LGA 775 BX80547PE2667E Processor - Newegg.com
I agree with Corrosive,
Originally, the Prescott cpu did not have 64 bit functionality, as stated in this article.

Originally, Intel released two Prescott lines: the E-series, with an 800 MT/s FSB and Hyper-Threading support, and the low-end A-series, with a 533 MT/s FSB and Hyper-Threading disabled. Intel eventually added XD Bit (eXecute Disable) and Intel 64 functionality to Prescott.

https://en.wikipedia.org/wiki/Pentium_4#Prescott

I do not know at what point in time of manufacturing that Intel made the Prescott cpu a 64 bit chip, so if someone were to purchase this particular cpu, they would have really do some checking to be sure that they were actually getting a cpu with 64 bit support

 

[Joe C]

If you check out that wiki web page, you'll see that there are three groupings for the Prescott chip. Which adds to much confusion about which Prescott supports 64 bit. According to wiki:

Intel Family 15 Model 3 (C0,D0), Intel Family 15 Model 4 (E0, G1)
Intel 64: supported by 5x6, 511, and 519K

and...

Intel 64: supported by F-series, 5x1, 517, 524
Intel Family 15 Model 3

E series Prescotts do not have 64 bit support
and....
All 2M Prescotts.

Prescott 2M (90 nm)
Intel Family 15 Model 4
All models support: MMX, SSE, SSE2, SSE3, Hyper-Threading, Intel 64

https://en.wikipedia.org/wiki/List_of_Intel_Pentium_4_microprocessors#Prescott_.2890.C2.A0nm.29_2

It's no wonder that AMD was on top back then


.

 

[C0RR0SIVE]

Well, I can confirm that the Pentium 4 3.8Ghz SL7P2 is 64bit capable, handled a 64bit install of ubuntu long ago. Sad to say, this is my only P4, and it's never used... Flipping heat AND power monster.