Adding sdram

BIOS
I have a Hp pavilion4483, Intel Celeron  .433 MHz.  . I had 96mb sdram that came with it from the store, only 2 168 pin dimms on it. I think a stick of 64mb and one of 32mb. I bought a stick of 128mb sdram pc133, and took out both old rams and put 128 in the top slot and the 64mb stick back in the bottom slot. Im wondering if its wise to have 128 in one slot and 64 in the other on my pc? The hp web site for pavilion says my 64mb sdram is 66mhz, but this new 128 is a higher mhz. My system recognizes that i now have 192mb sdram. also, will my system use all the ram  or is it recognizing it without actually  using all of it?  Below are some specs from hp site for my system. Thanks in advance. Chris
Base processor and speed
Intel Celeron 433 MHz Processor

Chipset
440ZX/100

Memory
RAM (standard):
 96 MB (SDRAM)
 
Maximum:
 256 MB (2 x 128 MB)
 
Speed:
 66 MHz synchronous
 
Sockets:
 2 - 168 pin DIMMs
 
Size:
 16, 32, 64, or 128 MB DIMMs
 
Pairs Required?
 No
 
Type Supported:
 SDRAM, 66 MHz, Intel PC SDRAM unbuffered DIMM specification,
revision 1.0 compliant
 


Cache
Level 1 (Primary):
 32 KB (on processor)
 
Upgrade Sockets:
 None
 
Level 2:
 128 KB (on motherboard)
 


Hard drive
6.4 GB (3.5-inch form factor)

CD-ROM drive
Speed:
 32x maximum speed
 
Access Speed:
 75 ms
 
Transfer Rate:
 2.4-4.8 MB/sec
 
Bios: Falcon2 software build ID 2.15.15
OS  Windows 98