• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

E0 Stepping & EM64T

M

mike_j_johnson

Gawd
Joined
Nov 13, 2004
Messages
961
I have compiled a list of the three new CPUs with E0 Stepping and EM64T support. The 3.4GHz and 3.2GHz are probably a better buy since they are 84Watt CPUs instead of 115Watts for the 3.6GHz model (please post corrections if you find mistakes or missing features that I forgot):

MM#: 868259
S-Spec: SL836
Product Code: BX80547PG3600EK
Description: Boxed Retail Pentium 4 560J, 3.6GHz, 800MHz FSB, 1MB L2, PRB1, E0 Stepping, Prescott Core, EM64T, HT, EDB, TM2, C1E, LGA775, 115W, 90nm, SSE3


MM#: 868261
S-Spec: SL835
Product Code: BX80547PG3400EK
Description: Boxed Retail Pentium 4 550J, 3.4GHz, 800MHz FSB, 1MB L2, PRB0, E0 Stepping, Prescott Core, EM64T, HT, EDB, TM2, C1E, LGA775, 84W, 90nm, SSE3


MM#: 868263
S-Spec: SL832
Product Code: BX80547PG3200EK
Description: Boxed Retail Pentium 4 540J, 3.2GHz, 800MHz FSB, 1MB L2, PRB0, E0 Stepping, Prescott Core, EM64T, HT, EDB, TM2, C1E, LGA775, 84W, 90nm, SSE3
 
And I just got a D0 stepping. I guess that's the way of technology.
 
They were just released, so OEMs will probably get them first. I bet you wont see them until a month from now at the earliest. I could be wrong though...
 
How do these differ from the SL7NZ (3.6), SL7PZ (3.4), and SL7PX (3.2)? They're listed in the Intel Processor Spec Finder as being E0 stepping and support EM64T. How do they differ from the ones you listed?
 
The Spec Finder utility does not show "Retail Boxed" CPUs yet with E0 stepping and EM64T. Only OEM CPUs.
 
mike_j_johnson said:
The 3.4GHz and 3.2GHz are probably a better buy since they are 84Watt CPUs
Click to expand...
Wow, this is a big drop from the D0 step, which was 115W. Is this accurate or a misprint? How could they lower the wattage by that much in one step?
 
uclajd said:
No, 478 also. See: http://processorfinder.intel.com
Click to expand...

This is an OEM Prescott with 1 MB cache in S478 (SL7PN sSpec for this model) with a thermal guideline of 104W and a thermal spec of 73.2 C. The OEM order code is RK80546PG0881M. While slightly cooler than current S478 Prescotts, it's *still* an Easy-Bake Processor. The same processor in LGA775 has either the SL7PW or SL7PX sSpec; both have thermal guidelines of only 84W and thermal specs of 67.7C. So the LGA775 part runs 5.5 degrees cooler and uses twenty watts less.

The odd thing is, my own P4 2.6 HT Northwood-C (sSpec SL6WH) uses 15W less power than the faster LGA775 Prescott, but runs 7 degrees hotter (75 C). The S478 Prescott, OTOH, is 35 watts hungrier, but runs near 2 degrees C *cooler* (73.2 C vs. 75 C). Now I am thinking that airflow *and* power management is a greater issue with S478 Prescotts (especially power) than the same Prescotts in LGA775; however, comparing S478 Prescotts to Northwoods shows very little difference except in terms of power usage.

This *also* leads to the possible conclusion that a 500W PSU wouldn't be out of bounds for *any* Prescott, especially in S478; however, the newer LGA775 Prescotts have a lower thermal spec than even the slowest Northwood-Cs, despite the increased power.
usage.

That *also* likely indicates that the LGA775 mainboard does a lot better in terms of even *passive* thermal management than the S478 series mainboards.

All this is based on Intel's own specifications for all the compared processors.

Considering that most retail mainboards are still ATX, Intel has done something right.
 
PGHammer said:
This *also* leads to the possible conclusion that a 500W PSU wouldn't be out of bounds for *any* Prescott, especially in S478
Click to expand...
I'd say that 500W PSUs are mandatory if you want to overclock. The 478 boards are simply not equiped for Pressys' power demands, so you have to overkill.

You also need to do some mods to the 478 boards if you want to get the most out of your Pressy (vcore droop mod, added caps and mofsets).

There are extensive threads on this at oc-forums.com, which unfortunately are down ATM.

BTW, at 3920 @ 1.6v, my Pressy runs at >142W. :eek:
 
It won't matter on that motherboard. You can't overclock that far with an Intel branded board.

As long as you update your BIOS before installing it you'll be fine. I ran that board with a 3.0E Prescott D0 stepping on a 350Watt Antec PSU with an OC'ed Radeon X800Pro and had no problems.

So while it may consume more power and produce slightly more heat, it doesn't really make any tangible difference. Of course I did run a 3.0C on that board and for some things it was slightly faster than the 3.0E.
 
mckennaiii said:
i was considering the pressy for my intel d875pbz. v303
listed below are the links to the cpu i was considering.
i wanted to get the E0 stepping cpu.
this one has the 89w thermal guideline.
would i be better off to get a northwood.
i have a zalman cpns 7000 alcu to use on either cpu.

http://www.newegg.com/app/ViewProductDesc.asp?description=19-116-175&depa=0


http://processorfinder.intel.com/sc...am=483&PkgType=6544&SysBusSpd=6107&CorSpd=ALL
Click to expand...

The big issue would be your PSU first, then thermal management.

While the newer E0 P4s (which I suspect are single-core Noconas, as opposed to Prescotts) run cooler than Northwoods, they have higher power usage, like their Prescott older brothers. If you have a 400W PSU, upgrade it to at least 450W, if not 500W.
 
You must log in or register to reply here.
Back
Top