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400 MHz CPUs

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Processor Speed
Processor Speed

Measured in gigahertz (GHz) or megahertz (MHz), this is a measurement of the speed at which a processor executes instructions.

Bus Speed

L2 Cache

Socket Type
Socket Type

Also called the CPU slot, this refers to an electrical component that is attached to the PCB (printed circuit board). It corresponds with processor types and processor manufacturers.

Processor Type

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HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache - 1 MB - D6119A

HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache - 1...

Intel Pentium II Xeon, 400 MHz, Slot 2, L2 cache - 1 MB, 1 more

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IBM Processor upgrade: Intel Xeon 2.4 GHz Socket 603 L2 cache - 512 KB 400 MHz - 24P7456

IBM Processor upgrade: Intel Xeon 2.4 GHz Socket 603 L2 cache - 512 KB...

Intel Xeon, 2.4 GHz, Socket 603, 400 MHz, L2 cache - 512 KB, 1 more

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  • $95.00
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Intel Processor upgrade: Intel Xeon MP 2 GHz Socket 603 L2 - 512 KB - L3 cache - 2 MB 400 MHz

Intel Processor upgrade: Intel Xeon MP 2 GHz Socket 603 L2 - 512 KB - L3...

Intel Xeon MP, 2 GHz, Socket 603, 400 MHz, L2 - 512 KB - L3 cache - 2 MB, 1 more

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  • $235.00
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Intel Processor upgrade: Intel Xeon 2 GHz Socket 604 L2 cache - 512 KB 400 MHz

Intel Processor upgrade: Intel Xeon 2 GHz Socket 604 L2 cache - 512 KB...

Intel Xeon, 2 GHz, Socket 604, 400 MHz, L2 cache - 512 KB, 1 more

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  • from $14.38
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  • 2 Stores
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  • 2 coupons available

    • Code:
    • Detail:

      Use this online coupon to get $5 off orders over $5 when you pay with eBillMe at Buy.com

    • Expires:Dec-31-2009
    • Restriction:Unknow
    • Code:No Code Required
    • Detail:

      Receive Free Shipping on select items at eBay.

    • Expires:Dec-31-2010
    • Restriction:Unknow
Intel Processor upgrade: Intel Xeon MP 2.7 GHz Socket 603 L2 - 512 KB - L3 cache - 2 MB 400 MHz

Intel Processor upgrade: Intel Xeon MP 2.7 GHz Socket 603 L2 - 512 KB -...

Intel Xeon MP, 2.7 GHz, Socket 603, 400 MHz, L2 - 512 KB - L3 cache - 2 MB, 1 more

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  • $20.56
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  • 1 coupon available

    • Code:
    • Detail:

      Use this online coupon to get $5 off orders over $5 when you pay with eBillMe at Buy.com

    • Expires:Dec-31-2009
    • Restriction:Unknow
HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache - 512 KB - D7007A

HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache -...

Intel Pentium II Xeon, 400 MHz, Slot 2, L2 cache - 512 KB, 1 more

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HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache - 1 MB - 312286-B21

HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache - 1...

Intel Pentium II Xeon, 400 MHz, Slot 2, L2 cache - 1 MB, 1 more

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HP Processor upgrade: Intel Pentium II 400 MHz Slot 1 L2 cache - 512 KB - 313612-B21

HP Processor upgrade: Intel Pentium II 400 MHz Slot 1 L2 cache - 512 KB...

Intel Pentium II, 400 MHz, Slot 1, L2 cache - 512 KB, 1 more

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IBM Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache - 512 KB

IBM Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache -...

Intel Pentium II Xeon, 400 MHz, Slot 2, L2 cache - 512 KB, 1 more

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IBM Processor upgrade: Intel Xeon MP 2.2 GHz Socket 603 L2 - 512 KB - L3 cache - 2 MB 400 MHz

IBM Processor upgrade: Intel Xeon MP 2.2 GHz Socket 603 L2 - 512 KB - L3...

Intel Xeon MP, 2.2 GHz, Socket 603, 400 MHz, L2 - 512 KB - L3 cache - 2 MB, 1 more

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  • $300.00
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  • 1 coupon available

    • Code:No Code Required
    • Detail:

      Receive Free Shipping on select items at eBay.

    • Expires:Dec-31-2010
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IBM Processor upgrade: Intel Xeon 2 GHz Socket 603 L2 cache - 512 KB 400 MHz - 25P2653

IBM Processor upgrade: Intel Xeon 2 GHz Socket 603 L2 cache - 512 KB 400...

Intel Xeon, 2 GHz, Socket 603, 400 MHz, L2 cache - 512 KB, 1 more

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  • $182.00
  • at Buy.com
  • at Buy.com
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  • 1 coupon available

    • Code:
    • Detail:

      Use this online coupon to get $5 off orders over $5 when you pay with eBillMe at Buy.com

    • Expires:Dec-31-2009
    • Restriction:Unknow
Intel Processor upgrade: Intel Pentium M 1.5 GHz Socket 478 L2 cache - 1 MB 400 MHz

Intel Processor upgrade: Intel Pentium M 1.5 GHz Socket 478 L2 cache - 1...

Intel Pentium M, 1.5 GHz, Socket 478, 400 MHz, L2 cache - 1 MB, 1 more

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Intel Processor upgrade: Intel Xeon 2 GHz Socket 603 L2 cache - 512 KB 400 MHz - BX80532KC2000D

Intel Processor upgrade: Intel Xeon 2 GHz Socket 603 L2 cache - 512 KB...

Intel Xeon, 2 GHz, Socket 603, 400 MHz, L2 cache - 512 KB, 1 more

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  • $19.99
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  • 1 coupon available

    • Code:No Code Required
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      Receive Free Shipping on select items at eBay.

    • Expires:Dec-31-2010
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Intel Processor upgrade: Intel Celeron 2.4 GHz 400 MHz

Intel Processor upgrade: Intel Celeron 2.4 GHz 400 MHz
5 Reviews

Intel Celeron, 2.4 GHz, 400 MHz more

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  • $40.00
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    Selected reviews for:

    Intel Processor upgrade: Intel Celeron 2.4 GHz 400 MHz
    • From:Review Centre
    • Posted:Nov-15-2005
    • Review of Intel Celeron Processor
    • The Celerons that Intel first introduced as a low-cost CPU alternative (266 & 300MHz versions) were basically just Pentium-II's without any L2 cache at all. This deficiency really punished Celeron...
    • read full review | report as inappropriate
    • From:Review Centre
    • Posted:Mar-14-2004
    • Review of Intel Celeron Processor
    • It's right, the Intel Celeron is a poor man's pentium - good for internet or the odd games, mind you, i have still got my 600mzh celeron in my drawer, i like my p3, mind you the celeron is faster...
    • read full review | report as inappropriate
    • From:Anandtech
    • Posted:Aug-25-1998
    • After the introduction of the Pentium II, there were rumors of Intel working on a 266MHz Socket-7 Pentium MMX processor, code-named the Tillamook. With current Pentium MMX 233's...
    • read full review | report as inappropriate
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HP Processor upgrade: Intel Pentium II 400 MHz Slot 1 L2 cache - 512 KB - D6092A

HP Processor upgrade: Intel Pentium II 400 MHz Slot 1 L2 cache - 512 KB...

Intel Pentium II, 400 MHz, Slot 1, L2 cache - 512 KB, 1 more

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HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache - 512 KB - 312285-B21

HP Processor upgrade: Intel Pentium II Xeon 400 MHz Slot 2 L2 cache -...

Intel Pentium II Xeon, 400 MHz, Slot 2, L2 cache - 512 KB, 1 more

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HP Processor upgrade: Intel Xeon 2.8 GHz Socket 603 L2 cache - 512 KB 400 MHz - 306504-B21

HP Processor upgrade: Intel Xeon 2.8 GHz Socket 603 L2 cache - 512 KB...

Intel Xeon, 2.8 GHz, Socket 603, 400 MHz, L2 cache - 512 KB, 1 more

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  • from $55.00
  • Free Shipping
  • 3 Stores
  • at 3 Stores
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HP Processor upgrade: Intel Xeon 1.7 GHz Socket 603 L2 cache - 256 KB 400 MHz

HP Processor upgrade: Intel Xeon 1.7 GHz Socket 603 L2 cache - 256 KB...

Intel Xeon, 1.7 GHz, Socket 603, 400 MHz, L2 cache - 256 KB, 1 more

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  • from $70.00
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  • 3 Stores
  • at 3 Stores
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HP Processor upgrade: Intel Xeon MP 1.5 GHz Socket 603 L2 - 512 KB - L3 cache - 1 MB 400 MHz

HP Processor upgrade: Intel Xeon MP 1.5 GHz Socket 603 L2 - 512 KB - L3...

Intel Xeon MP, 1.5 GHz, Socket 603, 400 MHz, L2 - 512 KB - L3 cache - 1 MB, 1 more

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  • from $50.00
  • Free Shipping
  • 4 Stores
  • at 4 Stores
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IBM Processor upgrade: Intel Xeon MP 2.7 GHz Socket 603 L2 - 512 KB - L3 cache - 2 MB 400 MHz

IBM Processor upgrade: Intel Xeon MP 2.7 GHz Socket 603 L2 - 512 KB - L3...

Intel Xeon MP, 2.7 GHz, Socket 603, 400 MHz, L2 - 512 KB - L3 cache - 2 MB, 1 more

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  • from $270.00
  • Free Shipping
  • 2 Stores
  • at 2 Stores
    images/v5/compare_but.gif

  • 2 coupons available

    • Code:
    • Detail:

      Use this online coupon to get $5 off orders over $5 when you pay with eBillMe at Buy.com

    • Expires:Dec-31-2009
    • Restriction:Unknow
    • Code:No Code Required
    • Detail:

      Receive Free Shipping on select items at eBay.

    • Expires:Dec-31-2010
    • Restriction:Unknow
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