WC> Well one sale item was PC133 and I can't use them and the other was
WC> 256 Meg per stick and this machine only takes 2 x's 128 sticks.

WC> Detailed info on this machines and it's DIMMS is scarce, little to
WC> nothing in the owners manual except 2 x's 128 max and how to remove
WC> them.

So, did you find these pages?

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http://www.hp.com/cgi-bin/cposupport/get_doc.pl?SNI=
pvpc&LC=personal_computing&Tfile=bph03886&Smplr=Y#P102_9957

DIMM modules for the HP Pavilion PC must meet the following requirements

Synchronous Dynamic Random Access Memory (SDRAM). Only use DDR type
SDRAM memory if the computer came with DDR-SDRAM.

168 pins (184 pins for computers containing DDR-SDRAM)
Intel version 1.0 compliant
Single or double-sided
3.3 Volts (2.5 Volts for DDR-SDRAM)
64-bit unbuffered
Intel 4-clock
66 MHz/10 ns, 100 MHz/10 ns, or 133 MHz/10 ns
NOTE: PC 133 MHz RAM is backward compatible. In most cases, PC 133 MHz
Ram will work in systems that use PC 100 RAM but the RAM will operate at
the lower speed of PC 100 MHz. If PC 133 MHz RAM does not operate at 100
MHz, then only install PC 100 MHz Ram.

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http://h20015.www2.hp.com/en/document.jhtml?lc=en&docName=
bph05294&prodId=hppavilion10976

DIMM modules for the HP Pavilion PC Model 66xx must meet the following
requirements:

The maximum size of a DIMM module (for one socket) is 128 MB.
Motherboards with two DIMM sockets accept up to 256 MB of memory
 (2 x 128).
Motherboards with three DIMM sockets accept up to 384 MB of
 memory (3 x 128).
All DIMMs must be 168-pin, 4-clock, unbuffered Synchronous
 Dynamic Random Access Memory (SDRAM) modules.
DIMM SDRAM modules can be 16 MB, 32 MB, 64 MB, or 128 MB.
Synchronous memory access is at the clock rate of 100 MHz.

___-------------------------------------------------

http://h20015.www2.hp.com/en/document.jhtml?lc=en&docName=bph04786&
prodId=hppavilion10976

HP Pavilion PC Model 4483 (US) - Product Specifications

(Much too long to post here, unless you really want me to...)

  * SLMR 2.1a *

--- Maximus 3.01