I found some RAM online that I want to purchase but I don't know if it's compatible with my computer. I know for a fact that my computer takes PC133 SDRAM 168-pin. Now is that all I need to know to make the purchase or is there still the possibility that it might not work?
The memory in question is IBM PC133 reg ECC SDRAM 33L3151 (and my computer is an IBM NetVista M41 6792-xxx). I hope I provided enough info! I'm in desparate need of RAM and I can't find the answer anywhere! 
Thanks in advance for any help!
It should work. While there's always the possibility of RAM not working for bizzare reasons (like a Samsung PC133 chip working where a Micron PC133 won't, even though the specs are identical) it's usually due to being the wrong type entirely- PC2700 instead of PC2100 or PC133 instead of PC100.
Then of course you have the extreme cases where it doesn't even fit- getting DDR when you needed Rambus or DDR2 etc. Unfortunately, all you can do is check the specs carefully, and hope. If I remember correctly, the Netvista series accept single RAM chips, so you don't have worry about buying in pairs.
You can usually even mix ECC and non-ECC memory on the same motherboard, just not in the same bank. While ECC is generally intended for servers, it runs a bit slower- so demand for that type of RAM is less (hence lower prices)
Or... you could buy something like this (searching Ebay specifically for Netvista M41 memory)
Server RAM 8GB 4x 2GB PC2700R ECC REG DDR 333MHz 184-pin 36-Chip 2Rx4 Memory LOT, NEW HP 2GB Micron MT18HTF25672Y PC2-3200 DDR2 Memory RAM 345114-061 ECC Reg, Server RAM 4GB 2x 2GB PC3-10600R ECC REG DDR3 1333MHz Memory LOT FIT Dell HP IBM, Samsung 4GB 2x 2G DDR PC2100 184p ECC REG SERVER MEMORY Dell Certified Ram, Server RAM 16GB 8@2GB HP xw9300 373030-051 ECC REG PC3200R DDR 400 184pin Memory, Server RAM 4GB 2@2GB FIT HP Proliant G4 DL585 DL360 ML350 PC2700R ECC REG Memory, Server RAM 8GB 4x 2GB PC2100R FITS Dell Poweredge 1750 2600 2650 ECC REG Memory, 512MB HP D8267A 133MHz D8267-60000(64Mx72) PC133 REG. SDRAM SERVER MEMORY RAM!!!, 1GB 2X 512MB PC133 Desktop memory ram PC ECC non reg upgrade computer unbuffered, 1GB 2X 512MB PC133 Desktop memory ram PC ECC non reg upgrade computer unbuffered, 1GB 2X 512MB PC133 Desktop memory ram PC ECC non reg upgrade computer unbuffered, 1GB 2X 512MB PC133 Desktop memory ram PC ECC non reg upgrade computer unbuffered, 6GB (12 x 512MB) Server RAM Memory DDR 266 CL2.5 ECC Reg PC-2100R Micron , Lot of 50 1GB DDR PC2700 ECC Reg Samsung Infineon Crucial Server RAM Memory, 4x Samsung Memory 1GB PC3-8500/DDR3 Reg Server RAM , 4x 2GB Kingston KTH8348/2G PC-2700 ECC REG Server DDR-333 Memory RAM ML350 DL360, 4x 2GB Kingston KTM5037/4G DDR-266 PC2100 ECC REG Memory RAM IBM 41P0252 x335, 6x 2GB Dataram DDR-333 PC2700 ECC REG Server Memory RAM IBM 325 eServer PC2700R, 4GB kit 4200F PC2 2Rx8 4x1GB Ecc Reg Server Ram Memory, Cisco 16GB (2X8GB) DDR3 MEMORY RAM PC3-10600 ECC REG DIMM, NOT FOR PC- Micron 4GB 4x 1GB ECC REG PC3200R DDR 400MHz 184-pin CL3 Memory RAM, 4GB Simpletech PC2-5300 DDR2 667 ECC REG Server Memory RAM Fully Buffered FBDIMM, Lot 10x HP 345113-051 PC2-3200R Reg 1GB DDR2 Server Memory DIMM RAM DL380 G4, Server RAM 8GB 4x 2GB FITS HP xw6200 xw8200 ECC REG PC2-3200R DDR2 240pin Memory, Server RAM 8GB 4x 2GB FITS Dell Poweredge 2970, SC1435 PC2-5300P ECC REG Memory, 2GB (2X1GB) PC2100 266MHZ DDR 266 ECC Reg HYNIX RAM MEMORY LIFETIME WARRANTY, 2GB PC2700 DDR 333MHZ 184PIN ECC Reg 2X1GB SAMSUNG RAM MEMORY LIFETIME WARRANTY, 1GB DDR PC2700 333MHz ECC REG 184PIN DDR SAMSUNG RAM MEMORY LIFETIME WARRANTY, 2GB (2X1GB) PC2100 266MHZ DDR ECC Reg DDR SAMSUNG RAM MEMORY LIFETIME WARRANTY, 1GB PC2100 DDR 266MHZ 184PIN ECC Reg SAMSUNG BRAND RAM MEMORY LIFETIME WARRANTY, 1GB PC2100 DDR 266MHZ 184PIN ECC Reg KINGSTON BRAND RAM MEMORY LIFETIME WARRANTY, 2GB PC3200 DDR 184PIN 400MHZ ECC Reg (2)X1GB MICRON RAM MEMORY LIFETIME WARR, 2GB PC3200 DDR 184PIN 400MHZ ECC Reg (2)X1GB INFINEON RAM MEMORY LIFETIME WARR, 2GB PC3200 DDR 184PIN 400MHZ ECC Reg (2)X1GB HYNIX RAM MEMORY LIFETIME WARRANTY, 2GB PC2700 DDR 333MHZ 184PIN ECC Reg 2X1GB HYNIX RAM MEMORY LIFETIME WARRANTY, 1GB DDR PC2700 333MHz ECC REG 184PIN DDR HYNIX RAM MEMORY LIFETIME WARRANTY, 1GB PC2100 DDR 266MHZ 184PIN ECC Reg MICRON BRAND RAM MEMORY LIFETIME WARRANTY, 1GB PC2100 DDR 266MHZ 184PIN ECC Reg HYNIX BRAND RAM MEMORY LIFETIME WARRANTY, 2GB PC3200 DDR 184PIN 400MHZ ECC Reg (2)X1GB SAMSUNG RAM MEMORY LIFETIME WARR, Elpida 4GB 2x 2G DDR PC2100 184Pin ECC REG SERVER MEMORY RAM not for desktop, 8GB Samsung Crucial SERVER RAM Kit 2x 4GB DDR3 1066mhz PC3-8500R ECC REG Memory, Server RAM 8GB 4x 2GB FITS Dell Poweredge 2970, SC1435 PC2-5300P ECC REG Memory, Apple Xserve 2GB 4x 512MB DDR PC3200 400MHz ECC Micron Server Memory RAM Non REG, IBM 4GB Kit 2 x 2GB sticks) 39M5790 PC2-5300F CL5 REG ECC DDR2 Server Memory Ram, IBM 4GB Kit 2 x 2GB 39M5790 PC2-5300F CL5 REG ECC DDR2 Server Memory Ram, 4GB 4 x 1GB PC3200 REG DDR ECC SERVER MEMORY HP 373029-851 RAM, 4GB Server Memory Kit DDR PC3200 ECC REG 2x 2GB 400Mhz RAM ATP AB56L72Z4BFC4S, 2GB (1GB x2) ECC DDR REG 345113-851 PC2-3200R HP RAM Server Memory, Server RAM 8GB 2x 4GB PC3-8500R ECC REG DDR3 1066MHz 4Rx8 240pin Kingston Memory, Server RAM 4GB 2x 2GB PC2-3200R 2Rx4 ECC REG DDR2 400MHz 240-pin DIMM Memory LOT,
