Question about DFI PE21-EL Motherboard

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Best/Fastest CPU for DFI PE21-EL mobo

Hi I currently use the DFI PE21-EL motherboard with a 400mhz FSB and am looking to upgrade the cpu. I am currently running a 1.7ghz intel celeron cpu. The website says that the mobo supports up to a 2.4ghz Pentium 4 with the 400mhz FSB. However the website says that the mobo will support up to a 2.6ghz pentium 4 with the 400mhz FSB. The DFI website has no information on this mobo anymore.

My questions are these:

-What is the fastest pentium 4 cpu that I can use in my 400mhz FSB mobo?

-If it is in-fact the 2.6 cpu that is the fastest, do I need a driver or BIOS update to do this, and if so where can I find this driver or BIOS update.

-On some mobo's there is a jumper you can switch to change the FSB, does my mobo with the 400mhz fsb have the ability to be switched over to 533mhz FSB?

-Lastly, does anyone have access to the owners manual for this mobo, and if so could I get a copy of it, preferably in digital so there's no mail/shipping involved.

Thank you for your time, it is much appreciated. Please let me know if there is anymore information you need from me.

Merry Christmas and thanks again.

-Jared Hicks

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  • 2 more comments 
  • jchicks87 Dec 26, 2008

    Thanks for the help.

    To make my intentions short and sweet, I want to put the fastest cpu I can in the mobo, can I go any higher than the 1.9 P4 @ 400fsb?

    could I get the" 2.8 GHz
    21 x 533 MHz, Northwood
    1.525V not supported" and drop it below 1.525v? or does it just not
    work that way? (the reason I ask is because I currently have that cpu,
    it just didn't work in my computer, I figured it was the FSB that was

    Thank you again.

  • jchicks87 Dec 26, 2008

    Its funny that you just mentioned that because I just stumbled across the same information a few minutes ago. Thanks! I'm going to order the 2.53 and see what happens. I guess I'll update you in a few days or so.

    Thanks again.

  • jchicks87 Dec 27, 2008

    Alright, well just to add a little more to the plot:

    I took a look at the 2.8ghz processor I was sent, and on it there is an identifying code that reads :SL7E2. I looked that up at CPU-World and got this page: shows the compatible cpu's for my mobo, and when I click on the link for the 2.8 this is where it leads:

    Nowhere under that page lists SL7E2

    That 2.8 I have is different from the ones listed as compatible with my mobo.

    So now that I know this, is there still a chance that the 2.8 will work if I get one with the correct code, it should it not matter either way? Or if you could just take a look at the new information given and lend me your thoughts it would be much appreciated.

    Thanks again, and please let me know if that did not make sense and I will do my best to clarify.

  • jchicks87 Dec 27, 2008

    Well I wish there was an edit button but there is not. shows the other processors that are like the SL7E2 that I have. Turns out that I have a Prescott CPU, but my mobo needs a Northwood. So I'm guess that I've now answered my own question, and that the 2.8 Northwood should work?




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Your motherboard supports 2 different fsb's.
look these up @ cpu-world
you can use:
Intel Pentium 4 processor (478-pin)
- 533MHz system data bus - supports up to 2.8 GHz
- 400MHz system data bus - supports up to 2.4 GHz

Intel Celeron processor
- 400MHz system data bus - supports up to 2.0 GHz CPU speed
and here are the suppoted cpus:
Intel Celeron RK80531RC029128 BX80531P170G128 1.7 GHz 17 x 400 MHz, Willamette Any A RK80531RC033128 BX80531P180G128 1.8 GHz 18 x 400 MHz, Willamette Any A RK80531RC037128 BX80531P190G128 1.9 GHz 19 x 400 MHz, Willamette Any A RK80532RC041128 BX80532RC2000B 2.0 GHz 20 x 400 MHz, Northwood A 1.525V not supported RK80532RC045128 BX80532RC2100B 2.1 GHz 21 x 400 MHz, Northwood A 1.525V not supported Intel Pentium 4 RK80532PC021512 1.5 GHz 15 x 400 MHz, Northwood Any A RK80532PC025512 BX80532PC1600D 1.6 GHz 16 x 400 MHz, Northwood Any A RK80532PC029512 1.7 GHz 17 x 400 MHz, Northwood Any A RK80532PC033512 BX80532PC1800D 1.8 GHz 18 x 400 MHz, Northwood Any A RK80532PC037512 1.9 GHz 19 x 400 MHz, Northwood Any A RK80532PC041512 BX80532PC2000D 2.0 GHz 20 x 400 MHz, Northwood A 1.525V not supported 2.1 GHz 21 x 400 MHz, Northwood A 1.525V not supported RK80532PC049512 BX80532PC2200D 2.2 GHz 22 x 400 MHz, Northwood A 1.525V not supported RK80532PE051512 BX80532PE2266D 2.26 GHz 19 x 533 MHz, Northwood A 1.525V not supported RK80532PE056512 BX80532PE2400D 2.4 GHz 18 x 533 MHz, Northwood A 1.525V not supported RK80532PC056512 BX80532PC2400D 2.4 GHz 24 x 400 MHz, Northwood A 1.525V not supported RK80532PC060512 BX80532PC2500D 2.5 GHz 25 x 400 MHz, Northwood A 1.525V not supported RK80532PE061512 BX80532PE2533D 2.53 GHz 19 x 533 MHz, Northwood A 1.525V not supported RK80532PC064512 BX80532PC2600D 2.6 GHz 26 x 400 MHz, Northwood A 1.525V not supported RK80532PE067512 BX80532PE2667D 2.66 GHz 20 x 533 MHz, Northwood A 1.525V not supported RK80532PE072512 BX80532PE2800D 2.8 GHz 21 x 533 MHz, Northwood A 1.525V not supported

Posted on Dec 26, 2008

  • TweakX Dec 26, 2008

    CPU: P4(SOCKET 478), SUPPORT UP TO 2.53GHZ(533MHZ) OR 2.4GHZ(400MHZ)

  • TweakX Dec 27, 2008

    here is the link to the manufacturer specs,downloads ,cpu support.
    I believe that it will support the 2.8 northwood but I can't say for certain.Myself if I were in your shoes I would go for it.
    Here is the one that I would go for
    Pentium 4 Northwood 2.8 FSB :533MHz
    Hope it helps



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