Ram for only AM3 motherboard but not FM1 and the others?

[thisisaac]

hi there im planning to build a pc for the first time and i came across a 4gb ddr3 killsre ram module, it says its for AM3 motherboard, not for FM1,FM2,A55,A75,A85 series motherboard. Why is this so? The motherboard i plan on getting is GIGABYTE GA-A55-S3P and AMD ATHLON II X4 631 CPU. Here is the link to the killsre Ram

https://www.aliexpress.com/item/8GB-2pcs-4GB-DDR3-PC3-10600U-1333Mhz-memory-for-AMD-mainboard-ONLY-Free-Shipping/32222077805.html?ws_ab_test=searchweb0_0,searchweb201602_2_10152_5000015_10151_10065_10344_10068_10345_10342_10343_10340_10341_5130015_10541_10084_10083_10307_10539_5080015_10312_10313_10059_10314_10534_100031_10604_10603_10103_10605_5060015_10596_10107_10142,searchweb201603_25,ppcSwitch_7&algo_expid=fdf1fffc-88e9-49b3-ae47-a4e8aa777a0c-0&algo_pvid=fdf1fffc-88e9-49b3-ae47-a4e8aa777a0c&rmStoreLevelAB=1

 

[CountMike]

It doesn't matter even if it said it's for Intel !!!! RAM is same.

 

[salerhino]

I wouldn't buy that crap because there were reported problems with compatibility here and there.
I would buy used RAM before that aliexpress one.
(Even if it has 3500+ reviews)

 

[CountMike]

I found that Kingston has most compatible RAM with older AMD systems.