Help me ID a DDR RAM module ... and ID if it's what I ordered!

Factual Questions
1

So, I’m replacing the hard drive on my mac mini g4 (the disk died). I figured, so long as I had everything open, I might as well upgrade the RAM from 512k to 1GB, its max.

Here’s what the Mini is supposed to support:
Supports 184-pin PC2700 (333 MHz) DDR SDRAM.

I order this from a vendor:

1GB DDR PC2700 333MHz ECC REGISTERED 184 PIN DDR RAM
It arrives. Curious thing—it’s half the height of the RAM module that’s in my Mini. But, OK–chips get smaller all the time. I figure technology has advanced.

I install the RAM and start up the machine. Nothing. Power light comes on, blinks for a minute or so, then goes out. I try it with the original RAM–the Mini starts up and starts looking for an Operating System, as it should. Put the new RAM back in, same nothing again.

Now I’m concerned that I didn’t get one of the crappy old RAM modules I need, but rather some newfangled one that the aging Mini can’t recognize. Here are the various identifying marks on the module:

[one side:]
11S36P3336Z1NYP5992YD
IBM NET FRU:73P5125 509

[other side]
WARRANTY VOID IF REMOVED 1302 7051500667
WARRANTY VOID IF REMOVED

[on the individual memory chips themselves, of which there are 18, plus some other smaller components:]
INFINEON B
HYB25D512400BC—5
FSS25132
0522
A Google search on “FRU:73P5125” leads me to believe that this chip is, in fact, a 400MHz PC3200 module, not a 333MHz PC2700 module as I ordered. Am I correct? More importantly, is the PC3200 incompatible with the Mini? Or is it more likely the module is damaged? Or something else I’m overlooking?

2

You should not have gotten ECC/Registered memory. You bought something for a server (or a workstation), and probably paid a fair premium for it. The mac pros use ECC, but not the barebones mini.

3

Rats.

Actually, I paid about 1/2 to 1/3 what I’ll have to pay to get one listed specifically as being for the mac mini. (Since it’s the wrong one, though, doesn’t help me any!)

4

Ha, well, never buy RAM that’s “listed” to be specifically for a machine. That is always a huge scam. But you can get any DDR module on newegg, and it will be very cheap.

5

Before I buy memory, I usually go to Crucial and run their little system scanner. It’ll tell you exactly what your configuration is, and show you what upgrades are possible, with a list of buying options. Their prices are usually in line with what you’d get at NewEgg, but you can also just take the part number and find it cheaper elsewhere if you want.

6

Another vote for Crucial and their little memory scanner applet. I’ve used it many times and never gone wrong…TRM

7

I’ll try Crucial shortly. I didn’t have a working hard drive at the time, so I couldn’t really use it then. The OS is being installed as we speak… Poor machine. It’s going to have to sit around with its guts hanging out for another week.