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DDR vs. PC-133 - Confusion over RAM types.

B

bluemax

Diamond Member
Crucial has some AWESOME memory prices right now... taken from one page:


<< 256MB PC2100 DDR-SDRAM, 184-pin DIMM More info . . . . . . . . . . . . . . . . . . . $59.39 Buy
128MB PC2100 DDR-SDRAM, 184-pin DIMM More info . . . . . . . . . . . . . . . . . . . $31.49 Buy
128MB PC100 SDRAM, 144-pin SODIMM More info. . . . . . . . . . . . . . . . . . . . . . $49.49 Buy
256MB PC133 SDRAM, 168-pin DIMM More info . . . . . . . . . . . . . . . . . . . . . . . . $59.39 Buy
512MB PC133 SDRAM, 168-pin DIMM More info . . . . . . . . . . . . . . . . . . . . . . . $199.01 Buy
256MB EDO, 168-pin DIMM More info. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $99.00 Buy >>


I might as well buy DDR ram since its the same price as PC-133, right?
Do I need a DDR supporting mobo to be able to use it though? (What I mean is, can it work AS pc-133 if the mobo doesn't support DDR?)
184-pin vs. 168-pin? Am I right that you NEED a DDR supporting mobo to even fir the stuff on the board? How could a 184-pin slot hold a 168-pin pc-133? :Q😱
 
I noticed there's also several types of PC-133 RAM....

SDRAM, PC133 ? CL=3 ? Unbuffered ? Non-parity ? 7.5ns ? 3.3V ? 32Meg x 64 $59.39
SDRAM, PC133 ? CL=2 ? Unbuffered ? Non-parity ? 7.5ns ? 3.3V ? 32Meg x 64 $62.99
SDRAM, PC133 ? CL=3 ? Unbuffered ? ECC ? 7.5ns ? 3.3V ? 32Meg x 72 $63.89
SDRAM, PC133 ? CL=2 ? Unbuffered ? ECC ? 7.5ns ? 3.3V ? 32Meg x 72 $65.69
SDRAM, PC133 ? CL=3 ? Registered ? ECC ? 7.5ns ? 3.3V ? 32Meg x 72 $70.19
SDRAM, PC133 ? CL=2 ? Registered ? ECC ? 7.5ns ? 3.3V ? 32Meg x 72 $72.89

What's the real differences? What is CL=x? ECC vs. NP?
 
ECC is error checking RAM, which is what Scouzer said by Non-Parity RAM. By purchasing Non-Parity RAM, your getting Non-ECC RAM. This is a good thing in personal computers, it means you get a bit more performance.
 


<< Can't argue over saving a few bucks while I'm at it. 😉 I presume this is a good brand of RAM too? >>



You better believe it is a good brand. Crucial is arguable the best RAM maker around. Most everyone uses their RAM if they are building a system from scratch. Good luck, and buy plenty of RAM (the prices just aren't going to go too much lower, I don't think 😉).

Good Luck!

Beau
 
ecc is a fancy bit of kit bolted on ya dimms for mission critical systems. something about a double stop bit that happens once every n'th (lots and lots of) instruction that ecc catches and ensures doesnt crash your rig. However most Win users wouldnt know the difference from the avg bsod ensuing windows belch, and wether preventing one crash in x days compared with a 3% odd performance loss every day in memory is worth it will be up to the individual user

If your into ultra stable systems and rarely push the envelopes of your HW, then get it, its cheap (but make sure ALL sticks have it, or theres no point) ..... but if your the avg user with a cluttered Win9x o/s, or the kinda user that 3% performance loss turns you white, dont bother, you wont miss it.
 
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