http://i126.photobucket.com/albums/p101/uzumaki_arashi_album/341-0741-a_zps693ee1f8.jpg

http://i126.photobucket.com/albums/p101/uzumaki_arashi_album/341-0741-b_zps3a4847b3.jpg

One was pulled out of a 6100 I just got because I noticed something different. I dug through my pile 'o SIMMs and found 2 other boards all bearing the same Apple part number 341-0741. But all 3 are different designs.  The 2 with 2 chips on each sides seems common with the stickered part number (bottom stick) being older and printed number (middle stick) being newer but what's with the top one featuring 4 square packages on each sides? The pin notches are exactly the same so it seems to be designed for first generation PowerMac

http://i126.photobucket.com/albums/p101/uzumaki_arashi_album/341-0757_zps1ad08fb8.jpg

I also found this one, same pin notching as the known Apple x100 ROM SIMMs but it has different number 341-0757 and I couldn't find out via Google if it's from specific model or what.  

http://i126.photobucket.com/albums/p101/uzumaki_arashi_album/unknown_zpsb236347e.jpg

Another one that also fits x100 slots but no Apple part number I could search with. Clone ROM? Or cache?

And last one: this one belongs to ID-10-T error

http://i126.photobucket.com/albums/p101/uzumaki_arashi_album/dram_wtf_zpsf1b2ded2.jpg

What idiot cuts the memory stick to make it fit a different notch?  If it doesn't fit, it's for a reason. I doubt it ever worked when I pulled out of a dead 8600 and put it aside and forgot about it. I didn't even notice it until I was comparing the notches to sort out the PCxx from DDR and DDR2 modules I have in my pile of parts.  I thought it might have been an ECC originally but it has only 8 chips on one side and none on back so it can't be ECC (ECC usually have # of chips divisible by 3)